TARGET : PRE-MEDICAL 2020

NURTURE COURSE
NEET UG (RACE # 01)
TOPIC NAME : MOLE CONCEPT CHEMISTRY
1. 1 amu is equal to 9. The number of molecule at NTP in 1 ml of an
1
of C - 12
1
of O - 16 ideal gas will be
(1) (2)
12 14
(1) 6 ´ 10 23 (2) 2.69 ´ 10 19
(3) 1g of H 2 (4) 1.66 ´ 10 -23 kg
(3) 2.69 ´ 10 23 (4) None of these
2. 1 mol of CH 4 contains
10. The weight of a molecule of the compound
(1) 6.02 ´ 10 23 atoms of H
C 60 H 122 is
(2) 4 g atom of Hydrogen
(1) 1.4 ´ 10 -21 g (2) 1.09 ´ 10 -21 g
(3) 1.81 ´ 10 23 molecules of CH 4
(4) 3.0 g of carbon (3) 5.025 ´ 10 23 g (4) 16.023 ´ 10 23 g
3. 7.5 grams of a gas occupy 5.6 litres of volume 11. Which of the following has least mass
at STP the gas is (1) 2 g atom of nitrogen
(1) NO (2) N 2 O (3) CO (4) CO2
(2) 3 ´ 10 23 atoms of C
4. The number of atoms in 4.25 g of NH 3 is ap- (3) 1 mole of S
proximately
(4) 7.0 g of Ag
(1) 1 ´ 10 23 (2) 2 ´ 10 23
12. How many mole of helium gas occupy 22.4 L
(3) 4 ´ 10 23 (4) 6 ´ 10 23
at 0 o C at 1 atm. pressure
5. One litre of a gas at STP weight 1.16 g it can
possibly be (1) 0.11 (2) 0.90 (3) 1.0 (4) 1.11
(1) C 2 H 2(2) CO (3) O 2 (4) CH 4 13. Volume of a gas at STP is 1.12 ´ 10-7 cc. Calcu-
6. The mass of a molecule of water is late the number of molecules in it
(1) 3 ´ 10-26 kg (2) 3 ´ 10-25 kg (1) 3.01 ´ 10 20 (2) 3.01 ´ 1012
(3) 1.5 ´ 10 -26 kg (4) 2.5 ´ 10 -26 kg (3) 3.01 ´ 10 23 (4) 3.01 ´ 10 24
7. If N A is Avogadro’s number then number of 14. 4.4g of an unknown gas occupies 2.24 L of vol-
valence electrons in 4.2 g of nitride ions ( N 3- ) ume at standard temperature and pressure. The
gas may be
(1) 2.4 N A (2) 4.2 N A
(1) Carbon dioxide (2) Carbon monoxide
(3) 1.6 N A (4) 3.2 N A (3) Oxygen (4) Sulphur dioxide
8. Rearrange the following (I to IV) in the order
15. The number of moles of oxygen in 1 L of air
of increasing masses and choose the correct
answer from (1), (2), (3) and (4) (Atomic mass: containing 21% oxygen by volume, in stand-
N=14, O=16, Cu=63). ard conditions, is
I. 1 molecule of oxygen (1) 0.186 mol (2) 0.21 mol
II. 1 atom of nitrogen (3) 2.10 mol (4) 0.0093 mol
III. 1 ´ 10-10 g molecules of oxygen 16. The number of molecules in 4.25 g of ammo-
nia are
IV. 1 ´ 10-10 g atoms of copper
(1) 0.5 ´ 10 23 (2) 1.5 ´ 10 23
(1) II<I<III<IV (2) IV<III<II<I
(3) II<III<I<IV (4) III<IV<I<II (3) 3.5 ´ 10 23 (4) 1.8 ´ 10 32

E Your Hard Work Leads to Strong Foundation 1

 TARGET : PRE-MEDICAL 2020 CHEMISTRY
17. Which one of the following pairs of gases con- 24. The number of molecules in 16 g of methane
tains the same number of molecules is
(1) 16 g of O 2 and 14 g of N 2 (1) 3.0 ´ 10 23 (2) 6.02 ´ 10 23
(2) 8 g of O 2 and 22 g of CO2 16 16
(3) ´ 10 23 (4) ´ 10 23
6.02 3.0
(3) 28 g of N 2 and 22 g of CO2
(4) 32 g of O 2 and 32 g of N 2 25. Number of molecules in 100 ml of each of
O 2 , NH 3 and CO 2 at STP are
18. Number of gm of oxygen in 32.2 g
Na 2 SO 4 .10 H 2 O is (1) In the order CO2 < O2 < NH 3
(1) 20.8 (2) 22.4 (3) 2.24 (4) 2.08 (2) In the order NH 3 < O 2 < CO2
19. The number of oxygen atoms in 4.4 g of CO2 is (3) The same
approx. (4) NH 3 = CO2 < O 2
(1) 1.2 ´ 10 23 (2) 6 ´ 10 22
26. The molecular weight of hydrogen peroxide is
(3) 6 ´ 10 23 (4) 12 ´ 10 23 34. What is the unit of molecular weight
20. The volume occupied by 4.4 g of CO 2 at STP (1) g (2) mol
is (3) g mol -1 (4) mol g -1
(1) 22.4 L (2) 2.24 L 27. How many molecules are present in one gram
(3) 0.224 L (4) 0.1 L of hydrogen
21. The number of water molecules present in a (1) 6.02 ´ 10 23 (2) 3.01 ´ 10 23
drop of water (volume 0.0018 ml) at room tem-
(3) 2.5 ´ 10 23 (4) 1.5 ´ 10 23
perature is
(1) 6.023 ´ 10 19 (2) 1.084 ´ 10 18 28. The largest number of molecules is in

(3) 4.84 ´ 10 17 (4) 19.7 kg of gold (1) 34 g of water (2) 28 g of CO2

22. 19.7kg of gold was recovered from a smug- (3) 46 g of CH 3OH (4) 54 g of N 2O5
gler. How many atoms of gold were recovered 29. The number of moles of sodium oxide in 620 g
(Au =197)
of it is
(1) 100 (2) 6.02 ´ 10 23 (1) 1 mol (2) 10 moles
(3) 6.02 ´ 10 24 (4) 6.02 ´ 10 25 (3) 18 moles (4) 100 moles
23. The total number of protons in 10 g of calcium 30. 2g of oxygen contains number of atoms equal
carbonate is ( N0 = 6.023 ´ 10 ) 23 to that in

(1) 1.5057 ´ 10 24 (2) 2.0478 ´ 10 24 (1) 0.5 g of hydrogen (2) 4 g of sulphur

(3) 3.0115 ´ 10 24 (4) 4.0956 ´ 10 24 (3) 7 g of nitrogen (4) 2.3 g of sodium

ANSWER KEY
Que. 1 2 3 4 5 6 7 8 9 10
Ans 1 2 1 4 1 1 1 1 2 1
Que. 11 12 13 14 15 16 17 18 19 20
Ans 2 3 2 1 4 2 1 2 1 2
Que. 21 22 23 24 25 26 27 28 29 30
Ans 1 4 3 2 3 3 2 1 2 2

2 Your Hard Work Leads to Strong Foundation E

 TARGET : PRE-MEDICAL 2020
NURTURE COURSE
(RACE # 02)
TOPIC NAME : MOLE CONCEPT CHEMISTRY
1. What is the weight of oxygen required for the 8. 1.24 gm P is present in 2.2 gm
complete combustion of 2.8 kg of ethylene (1) P4 S 3 (2) P2 S 2
(1) 2.8 kg (2) 6.4 kg
(3) PS2 (4) P2 S4
(3) 9.6 kg (4) 96 kg
9. The atomic weights of two elements A and B
2. 12g of Mg (at. mass 24) on reacting completely
are 40 and 80 respectively. If x g of A contains
with acid gives hydrogen gas, the volume of
which at STP would be y atoms, how many atoms are present in 2x g
of B
(1) 22.4 L (2) 11.2 L
y y
(3) 44.8 L (4) 6.1 L (1) 2 (2) 4
1
3. If 1 moles of oxygen combine with Al to form (3) y (4) 2y
2
Al 2 O 3 the weight of Al used in the reaction is 10. Assuming fully decomposed, the volume of
(Al = 27) CO2 released at STP on heating 9.85g of
(1) 27 g (2) 54 g BaCO3 (Atomic mass of Ba=137) will be
(3) 49.5 g (4) 31 g
(1) 0.84 L (2) 2.24 L
4. What weight of SO2 can be made by burning (3) 4.06 L (4) 1.12 L
sulphur in 5.0 moles of oxygen 11. The element whose a atom has mass of
(1) 640 grams (2) 160 grams 10.86 ´ 10 -26 kg is
(3) 80 grams (4) 320 grams (1) Boron (2) Calcium
5. What will be the volume of CO2 at NTP (3) Silver (4) Zinc
obtained on heating 10 grams of (90% pure) 12. The percentage of oxygen in NaOH is
limestone (1) 40 (2) 60 (3) 8 (4) 10
(1) 22.4 litre· (2) 2.016 litre 13. The percentage of nitrogen in urea is about
(3) 2.24 litre· (4) 20.16 litre (1) 46 (2) 85 (3) 18 (4) 28
6. 1.5 mol of O2 combine with Mg to form oxide 14. If two compounds have the same empirical for-
MgO . The mass of Mg (at. mass 24) that has mula but different molecular formula, they must
combined is have
(1) Different percentage composition
(1) 72 g (2) 36 g (3) 48 g (4) 24 g
(2) Different molecular weights
7. 100 mL of PH 3 on decomposition produced (3) Same viscosity
(4) Same vapour density
phosphorus and hydrogen. The change in
15. A compound (60 g) on analysis gave C = 24 g,
volume is H = 4 g, O = 32 g. Its empirical formula is
(1) 50 mL increase (2) 500 mL decrease (1) C 2 H 2 O2 (2) C2 H 2 O

(3) 900 mL decrease (4) Nil. (3) CH 2 O2 (4) CH 2 O

E Your Hard Work Leads to Strong Foundation 3

 TARGET : PRE-MEDICAL 2020 CHEMISTRY
16. The empirical formula of a compound is CH 2 O. 22. The simplest formula of a compound
containing 50% of element X (atomic mass 10)
0.0835 moles of the compound contains 1.0 g
and 50% of element Y (atomic mass 20) is
of hydrogen. Molecular formula of the
compound is (1) XY (2) X 2 Y (3) XY3 (4) X 2 Y3
(1) C6H12 O6 (2) C 5 H 10 O 5 23. A compound possesses 8% sulphur by mass.
The least molecular mass is
(3) C 4 H 8 O8 (4) C 3 H 6 O3
(1) 200 (2) 400 (3) 155 (4) 355
17. The empirical formula of an acid is CH2O2 , the
probable molecular formula of acid may be 24. Which of the following contains maximum
number of atoms
(1) CH2O (2) CH2O2
(1) 6 .023 ´ 10 21 molecules of CO2
(3) C2 H4 O2 (4) C3 H6O4
18. In which of the following pairs of compounds (2) 22.4 L of CO2 at STP
the ratio of C, H and O is same
(3) 0.44 g of CO2
(1) Acetic acid and methyl alcohol
(4) None of these
(2) Glucose and acetic acid
(3) Fructose and sucrose 25. If 10 21 molecules are removed from 200mg of
CO2 , then the number of moles of CO2 left are
(4) All of these
19. Haemoglobin contains 0.33% of iron by (1) 2 .85 ´ 10 -3 (2) 28 .8 ´ 10 -3
weight. The molecular weight of haemoglobin
(3) 0.288 ´ 10 -3 (4) 1.68 ´ 10 -2
is approximately 67200. The number of iron
atoms (At. wt. of Fe = 56) present in one 26. In the reaction,
molecule of haemoglobin is
4 NH 3 (g) + 5O 2 (g) ® 4 NO(g ) + 6 H 2 O(g)
(1) 6 (2) 1 (3) 4 (4) 2
When 1 mole of ammonia and 1 mole of O 2 are
20. What is the % of H 2 O in Fe(CNS)3.3H2O
made to react to completion
(1) 45 (2) 30 (3) 19 (4) 25
(1) 1.0 mole of H 2 O is produced
21. The percentage of P2 O5 in diammonium
hydrogen phosphate ( NH 4 ) 2 HPO4 is (2) 1.0 mole of NO will be produced

(1) 23.48 (2) 46.96 (3) All the oxygen will be consumed
(3) 53.78 (4) 71.00 (4) All the ammonia will be consumed

ANSWER KEY
Que. 1 2 3 4 5 6 7 8 9 10
Ans 3 2 2 4 2 1 1 1 3 4
Que. 11 12 13 14 15 16 17 18 19 20
Ans 4 1 1 2 4 1 2 2 3 3
Que. 21 22 23 24 25 26
Ans 3 2 2 2 1 3

4 Your Hard Work Leads to Strong Foundation E

 TARGET : PRE-MEDICAL 2020
NURTURE COURSE
(RACE # 03)
TOPIC NAME : MOLE CONCEPT CHEMISTRY
1. When 10 ml of propane (gas) is combusted 9. Out of 1.0 g dioxygen, 1.0 g (atomic) oxygen
completely, volume of CO2(g) obtained in simi- and 1.0 g of ozone, the maximum number of
lar condition is - oxygen atoms are contained in -
(1) 10 ml (2) 20 ml (1) 1.0 g of atomic oxygen.
(3) 30 ml (4) 40 ml (2) 1.0 g of ozone.
2. The mass of 2 gram atoms of calcium (3) 1.0 g of oxygen gas.
(Relative atomic mass = 40) (4) All contain same number of atoms.
(1) 2 g (2) 0.05 g (3) 0.5 g (4) 80 g 10. 1 gm - atom of nitrogen represents -
3. Which of the following contains largest number (1) 6.02 x 1023 N2 molecules
of moles (2) 22.4 lit. of N2 at N.T.P.
(1) 1.0 g of O atoms (2) 1.0 g of O2 (3) 11.2 lit. of N2 at N.T.P.
(3) 1.0 g of O3 (4) 1.0 g SO 24 - (4) 28 g of nitrogen.
4. The number of molecules present in 88 g of 11. The number of atoms contained in 11.2 L of
CO2 (Relative molecular mass of CO2 = 44) SO2 at N.T.P. are -
(1) 1.24 × 1023 (2) 3.01 × 1023 (1) 3/2 x 6.02 x 1023 (2) 2 x 6.02 x 1023
(3) 6.023 × 1024 (4) 1.2046 ×1024 (3) 6.02 x 1023 (4) 4 x 6.02 x 1023
5. The number of Ca2+ and Cl¯ ions present in 12. If one mole of ethanol (C2H5OH) completely
anhydrous CaCl2 is 3.01 × 1023 and 6.023 × burns to carbon dioxide and water, the weight
1023 respectively. The weight of the anhydrous of carbon dioxide formed is about -
sample is - (1) 22g (2) 45g (3) 66g (4) 88g
(1) 40 g (2) 55.5 g 13. How many moles of electron weight one kilo-
(3) 222 g (4) 75.5 g gram ?
6. Two oxides of a metal contain 50% and 40% 1
metal M respectively. If the formula of the first (1) 6.023 × 1023 (2) ×1031
9.108
oxide is MO2, the formula of the second oxide
will be
6.023 1
(1) MO2 (2) MO3 (3) M2O (4) M2O5 (3) ×1054 (4) × 108
9.108 9.108 ´ 6.023
7. A carbon compound containing carbon and 14. In which of the following number of atoms
oxygen has molar mass equal to 288. On analy- are maximum ?
sis it is found to contain 50% by mass of each (1) 24 gms C (2) 27 gms of Al
element. Therefore molecular formula of the
(3) 56 gms of Fe (4) 108 gms of Ag
compound is -
15. 0.078 g of hydrocarbon occupy 22.4 ml of vol-
(1) C12O9 (2) C4O3
ume at 1 atm and 0ºC. The empirical formula
(3) C3O4 (4) C9O12
of the hydrocarbon is CH. The molecular for-
8. Volume of oxygen required for complete com- mula is -
bustion of 20 mL of propane gas is
(1) C2H2 (2) C4H4 (3) C6H6 (4) C8H8
(1) 20 mL (2) 40 mL
(3) 80 mL (4) 100 mL

E Your Hard Work Leads to Strong Foundation 5

 TARGET : PRE-MEDICAL 2020 CHEMISTRY
16. The number of sodium atoms in 2 moles of 24. A compound was found to contain 5.37% ni-
sodium ferrocyanide Na4[Fe(CN)6], is- trogen by mass. What is the minimum molecu-
(1) 2 (2) 6.023 × 1023 lar weight of compound -

(3) 8 × 6.02 × 1023 (4) 4 × 6.02 × 1023 (1) 26.07 (2) 2.607
17. Number of Ca+2 and Cl– ion in 111 g of an- (3) 260.7 (4) None of these
hydrous CaCl2 are - 25. An element (1) (at wt = 75) and another ele-
(1) NA, 2NA (2) 2NA, NA ment (2) (at. wt. = 25) combine to form a com-
(3) NA, NA (4) None of these pound. The compound contains 75% (1) by
weight. The formula of the compound will be
18. 2 moles of H2 at NTP occupy a volume of
(1) 11.2 litre (2) 44.8litre (1) A2B (2) A3B

(3) 2 litre (4) 22.4 litre (3) AB3 (4) AB

19. 4.48 litres of methane at N.T.P. correspond to 26. The empirical formula of a compound is CH.
- Its molecular weight is 78. The molecular for-
(1) 1.2 x 1022 molecules of methane mula of the compound will be -

(2) 0.5 mole of methane (1) C2H2 (2) C3H3

(3) 3.2 gm of methane (3) C4H4 (4) C6H6
(4) 0.1 mole of methane 27. An oxide of a metal (M) contains 40% by mass
20. 16 gm of SOx occupies 5.6 litre at STP. As- of oxygen. Metal (M) has atomic mass of 24.
suming ideal gas nature, the value of x is - The empirical formula of the oxide is-
(1) 1 (2) 2 (1) M2O (2) MO
(3) 3 (4) None of these (3) M2O3 (4) M3O4
21. The mass of carbon present in 0.5 mole of 28. Two oxides of Metal contain 27.6% and 30%
K4[Fe(CN)6] is - oxygen respectively. If the formula of first ox-
(1) 1.8 gm (2) 18 gm ide is M3O4 then formula of second oxide is -
(3) 3.6 gm (4) 36 gm (1) MO (2) M2O
22. 1.2 gm of Mg (At. mass 24) will produce MgO (3) M2O3 (4) MO2
equal to -
29. The formula which represents the simple ratio
(1) 0.05 mol (2) 40 gm of atoms in a compound is called -
(3) 40 mg (4) 4 gm
(1) molecular formula
23. The percent of N in 66% pure (NH4)2 SO 4
sample is - (2) structural formula
(1) 32 (2) 28 (3) empirical formula
(3) 14 (4) None of these (4) rational formula

ANSWER KEY
Que. 1 2 3 4 5 6 7 8 9 10
Ans 3 4 1 4 2 2 1 4 4 3
Que. 11 12 13 14 15 16 17 18 19 20
Ans 1 4 4 1 3 3 1 2 3 2
Que. 21 22 23 24 25 26 27 28 29
Ans 4 1 3 3 4 4 2 3 3

6 Your Hard Work Leads to Strong Foundation E

 TARGET : PRE-MEDICAL 2020
NURTURE COURSE
(RACE # 04)
TOPIC NAME : MOLE CONCEPT CHEMISTRY
1. 4.4 g of CO2 and 2.24 litre of H2 at STP are 7. The amount of sulphur required to produce
mixed in a container. The total number of mol- 100 moles of H2SO4 is -
ecules presents in the container will be -
(1) 3.2 × 103 gm (2) 32.65 gm
(1) 6.022 × 1023 (2) 1.2044 × 1023
(3) 32 gm (4) 3.2 gm
(3) 6.023 × 10 26
(4) 6.023 × 10 24
8. The weight of 2.01 × 10 23 molecules of CO
2. How many mol Fe ions are formed, when
2+
is -
excess of iron is treated with 50mL of 4.0M
(1) 9.3 gm (2) 7.2 gm
HCl under inert atmosphere ? Assume no
change in volume - (3) 1.2 gm (4) 3 gm

(1) 0.4 (2) 0.1 (3) 0.2 (4) 0.8 9. If half mole of oxygen combine with Al to form
Al2O3, the weight of Al used in the reaction
3. What mass of calcium chloride in grams would
is -
be enough to produce 14.35 gm of AgCl.
(1) 27 g (2) 40.5 g
(At. mass Ca = 40, Ag = 108) -
(3) 54 g (4) 18 g
(1) 5.55 gm (2) 8.295 gm
10. The mass of one molecule of propane, in gram,
(3) 16.59 gm (4) 11.19 gm
is
4. If the density of water is 1 gm/cm3, then the
(1) 44 (2) 44 × 6 × 1023
volume occupied by one molecule of water is
approximately-

(1) 18 cm3 (2) 22400 cm3 44 6 ´ 10 23

(3) 23 (4)
6 ´ 10 44
(3) 6.02 × 10–23 cm3 (4) 3.0 × 10–23 cm3

5. How many grams are contained in 1gm-atom 11. An organic compound made of C, H and N
of Na- contains 20% nitrogen. What will be its mo-
lecular mass if it contains only one nitrogen
(1) 13 gm (2) 23 gm
atom in it ?
(3) 1 gm (4) 1/23 gm
(1) 70 (2) 140
6. A sample of AlF3 contains 3.0 × 1024 F– ions.
(3) 100 (4) 65
The number of formula units in this sample
are - 12. Calculate the number of carbon atoms in 18 g
of glucose -
(1) 9.0 × 1024 (2) 3.0 × 1024
(1) 3.61 × 1023 (2) 7.22 × 1023
(3) 0.75 × 1024 (4) 1.0 × 1024
(3) 3.61 × 1022 (4) None of these

E Your Hard Work Leads to Strong Foundation 7

 TARGET : PRE-MEDICAL 2020 CHEMISTRY
13. If atomic mass of oxygen were taken as 100, 17. 1.5 g of oxygen is produced by heating
the molecular mass of water would be approxi- KClO3. KCl produced in the reaction is:
mately
(1) 0.0415 mol (2) 4.33 g
(1) 6.25 (2) 112.5
(3) 0.03125 mole (4) 8.68 g
(3) 102 (4) 106.25
18. Aspirin has the formula C9H8 O4. How many
14. The composition of a sample of wustite is atoms of oxygen are there in 360 mg tablet.
Fe 0.93 O. What preceentage of iron i s
(1) 1.204 × 1023 (2) 1.08 × 1022
present in the form of Fe(III) in sample?
(3) 1.204 × 1024 (4) 4.81 × 1021
(1) 14 % (2) 7 %
19. 3.011 × 10 22 atoms of element weight 1.15
(3) 93 % (4)15.05 %
grams. Atomic mass of element
15. 500 gm of a solution containing 12 % by
(1) 10 (2) 2.3 (3) 35.5 (4) 23
weight of solute has :
20. One litre of N2 and 7/8 litre of O2 under identi-
(1) wsolute = 60 gm cal conditions of Pressure and Temperature are
(2) wsolute = 12 gm
mixed. The amount of gases present in mix-
(3) wsolvent = 500 gm ture show:
(4) wsolvent = 44 gm
(1) wN2 = 3wO2 (2) wN2 = 8wO2
16. An aqueous solution has 45 gm of urea
(NH2CONH2) in 100 ml . Then :
(3) wN2 = wO2 (4) wN2 = 16wO2
(1) % w/v = 25
21. 224 mL of triatomic gas weights 1 g at 273 K
(2) strength (in g/L) = 45
and 1 atm. The mass of one atom of this gas is:
(3) M = 7.5
(1) 8.30 × 10–23 g (2) 2.08 × 10–23 g
(4) M = 4.5
(3) 5.53 × 10–23 g (4) 6.24 × 10–23 g

ANSWER KEY
Q ue. 1 2 3 4 5 6 7 8 9 10
Ans 2 2 1 4 2 4 1 1 4 3
Q ue. 11 12 13 14 15 16 17 18 19 20
Ans 1 1 2 4 1 3 3 4 4 3
Q ue. 21
Ans 3

8 Your Hard Work Leads to Strong Foundation E

 TARGET : PRE-MEDICAL 2020
NURTURE COURSE
(RACE # 05)
TOPIC NAME : DILUTION AND MIXING CHEMISTRY
1. 25 ml of 3.0 M HNO3 are mixed with 75 ml of 9. 5 ml of NHCl, 20 ml of N/2 H 2 SO4 and 30 ml
4.0 M HNO3 . If the volumes are additive, the of N/3 HNO3 are mixed together and volume
molarity of the final mixture would be made to one litre. The normally of the result-
(1) 3.25 M (2) 4.0 M ing solution is
N N N N
(3) 3.75 M (4) 3.50M (1) 5 (2) (3) (4)
20 40 25
2. Dilute one litre 1 molar H 2 SO4 solution by 5 10. The amount of 2 2 7 (eq. wt. 49.04) required
K Cr O
litre water, the normality of that solution is to prepare 100 ml of its 0.05 N solution is
(1) 0.2 N (2) 5 N (1) 2.9424 g (2) 0.4904 g
(3) 10 N (4) 0.33 N (3) 1.4712 g (4) 0.2452 g
3. 20 ml of HCl solution requires 19.85 ml of 11. 25ml of a solution of barium hydroxide on ti-
tration with a 0.1molar solution of hydrochlo-
0.01 M NaOH solution for complete neutraliza-
ric acid gave a titre value of 35 ml. The molarity
tion. The molarity of HCl solution is
of barium hydroxide solution was
(1) 0.0099 (2) 0.099
(3) 0.99 (4) 9.9 (1) 0.07 (2) 0.14 (3) 0.28 (4) 0.35
4. How much of NaOH is required to neutralise 12. Two solutions of a substance (non electrolyte)
1500 cm3 of 0.1 NHCl (At. wt. of Na =23) are mixed in the following manner 480 ml of
(1) 4 g (2) 6 g (3) 40 g (4) 60 g 1.5M first solution + 520 mL of 1.2M second
5. If 1 M and 2.5 litre NaOH solution is mixed solution. What is the molarity of the final mix-
with another 0.5 M and 3 litre NaOH solution, ture
then molarity of the resultant solution will be (1) 1.20 M (2) 1.50 M
(1) 1.0 M (2) 0.73 M (3) 1.344 M (4) 2.70 M
(3) 0.80 M (4) 0.50 M 13. Which of the following should be done in or-
6. 171 g of cane sugar (C12 H 22O11 ) is dissolved in der to prepare 0.40M NaCl starting with 100 ml
1 litre of water. The molarity of the solution is of 0.30M NaCl (mol.wt. of NaCl = 58.5 )
(1) 2.0 M (2) 1.0 M
(3) 0.5 M (4) 0.25 M (1) Add 0.585 g NaCl
7. The molarity of a solution made by mixing (2) Add 20 ml water
50ml of conc. H 2 SO4 (36N) with 50 ml of wa- (3) Add 0.010ml NaCl
ter is (4) Evaporate 10ml water
(1) 36 M (2) 18 M
14. 10.6 grams of a substance of molecular weight
(3) 9 M (4) 6 M
106 was dissolved in 100ml . 10ml of this solu-
8. The volumes of 4 N HCl and 10 N HCl required
tion was pipetted out into a 1000ml flask and
to make 1 litre of 6 N HCl are made up to the mark with distilled water. The
(1) 0.75 litre of 10 NHCland 0.25 litre of 4 N molarity of the resulting solution is
HCl
(1) 1.0M (2) 10 -2 M
(2) 0.25 litre of 4 NHCland 0.75 litre of 10 N
HCl (3) 10 -3 M (4) 10 -4 M
(3) 0.67 litre of 4 NHCland 0.33 litre of 10 N 15. If 20ml of 0.4 N NaOH solution completely neu-
HCl tralises 40ml of a dibasic acid. The molarity of
(4) 0.80 litre of 4 NHCland 0.20 litre of 10 N the acid solution is
HCl
(1) 0.1M (2) 0.2M (3) 0.3M (4) 0.4 M

E Your Hard Work Leads to Strong Foundation 9

 TARGET : PRE-MEDICAL 2020 CHEMISTRY
16. 1.0 gm of pure calcium carbonate was found 24. What is the molarity of H 2 SO4 solution, that
to require 50 ml of dilute HCl for complete re- has a density 1.84 gm/cc at and contains
35 o C
action. The strength of the HCl solution is solute 98% by weight
given by
(1) 4.18 M (2) 8.14 M
(1) 4 N (2) 2 N (3) 0.4 N (4) 0.2 N
(3) 18.4 M (4) 18 M
17. 0.5 M of H 2 SO4 is diluted from 1 litre to 10
litre, normality of resulting solution is 25. The weight of sodium carbonate required to
(1) 1 N (2) 0.1 N prepare 500 ml of a semi- normal solution is
(3) 10 N (4) 11 N (1) 13.25 g (2) 26.5 g
18. The volume of water to be added to 100cm 3 of (3) 53 g (4) 6.125 g
0.5 N H 2 SO4 to get decinormal concentration is 26. How much water is needed to dilute 10 ml of
(1) 400 cm3 (2) 500 cm 3 10 N hydrochloric acid to make it exactly
decinormal (0.1 N)
(3) 450 cm3 (4) 100 cm 3
19. If 25 ml of 0.25 M NaCl solution is diluted with (1) 990 ml (2) 1000 ml
water to a volume of 500ml the new concen- (3) 1010 ml (4) 100 ml
tration of the solution is 27. What is the volume of 0.1 N HCl required to
(1) 0.167 M (2) 0.0125 M
react completely with 1.0 g of pure calcium car-
(3) 0.833 M (4) 0.0167 M
bonate
20. Volume of water needed to mix with 10 ml
(Ca = 40, C = 12 and O = 16)
10N HNO3 to get 0.1 N HNO3
(1) 1000 ml (2) 990 ml (1) 150 cm 3 (2) 250 cm 3
(3) 1010 ml (4) 10 ml
(3) 200 cm 3 (4) 100 cm 3
21. A 5 molar solution of H 2 SO4 is diluted from 1
litre to 10 litres. What is the normality of the 28. 4.0 gm of NaOH are contained in one decilitre
solution of solution. Its molarity would be
(1) 0.25 N (2) 1 N (3) 2 N (4) 7 N (1) 4 M (2) 2 M
22. To neutralise completely 20 mL of 0.1 M aque- (3) 1 M (4) 1.5 M
ous solution of phosphorous acid (H3 PO3 ), the 29. What weight of ferrous ammonium sulphate is
volume of 0.1 M aqueous KOH solution re- needed to prepare 100 ml of 0.1 normal solu-
quired is tion (mol. wt. 392)
(1) 40 mL (2) 20 mL (1) 39.2 gm (2) 3.92 gm
(3) 10 mL (4) 60 mL
(3) 1.96 gm (4) 19.6 gm
23. How many grams of NaOH will be required to
neutralize 12.2 grams of benzoic acid 30. The number of moles of KCl in 1000 ml of 3
(1) 40 gms (2) 4 gms molar solution is
(3) 16 gms (4) 12.2 gms (1) 1 (2) 2 (3) 3 (4) 1.5

ANSWER KEY
Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Ans 3 4 1 2 2 3 2 3 3 4 1 3 1 2 1
Que. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Ans 3 2 1 2 2 2 1 2 3 1 1 3 3 2 3

10 Your Hard Work Leads to Strong Foundation E

 TARGET : PRE-MEDICAL 2020
NURTURE COURSE
(RACE # 06)
TOPIC NAME : CONCENTRATION TERMS CHEMISTRY
1. The amount of anhydrous Na2CO3 present in 12. What will be the normality of a 500 ml solution
250 ml of 0.25 M solution is containing 4.9 g. H 3 PO4 dissolved in water
(1) 6.225 g (2) 66.25 g (1) 0.3 (2) 1.0 (3) 3.0 (4) 0.1
(3) 6.0 g (4) 6.625 g 13. Which of the following modes of expressing
2. The molarity of 0.006 mole of NaCl in 100ml concentration is independent of temperature
solution is (1) Molarity (2) Molality
(1) 0.6 (2) 0.06 (3) Formality (4) Normality
(3) 0.006 (4) 0.066 14. The normality of a solution of sodium hydroxide
3. 9.8 g of H 2 SO4 is present in 2 litres of a solu- 100 ml of which contains 4 grams of NaOH is
tion. The molarity of the solution is (1) 0.1 (2) 40 (3) 1.0 (4) 0.4
(1) 0.1M (2) 0.05M 15. Molar solution means 1 mole of solute present
(3) 0.2M (4) 0.01M in
4. What will be the molarity of a solution con- (1) 1000g of solvent (2) 1 litre of solvent
taining 5 g of sodium hydroxide in 250 ml so- (3) 1 litre of solution (4) 1000g of solution
lution 16. A solution of Al 2 (SO4 )3 {d = 1.253 gm / ml} contain
(1) 0.5 (2) 1.0 (3) 2.0 (4) 0.1 22% salt by weight. The molarity, normality
5. The normality of 0.3M phosphorus acid and molality of the solution is
(H 3 PO3 ) is
(1) 0.805 M, 4.83 N, 0.825 m
(2) 0.825 M, 48.3 N, 0.805 m
(1) 0.1 (2) 0.9 (3) 0.3 (4) 0.6
(3) 4.83 M, 4.83 N, 4.83 m
6. Molarity is expressed as
(4) None
(1) Gram/litre (2) Moles/litre
17. Which of the following solutions has the high-
(3) Litre/mole (4) Moles/1000 gms
est normality
7. If 5.85 g of NaCl(molecular weight 58.5) is
(1) 8 gm of KOH / litre
dissolved in water and the solution is made up
(2) N phosphoric acid
to 0.5 litre, the molarity of the solution will be
(3) 6 gm of NaOH / 100 ml
(1) 0.2 (2) 0.4 (3) 1.0 (4) 0.1
(4) 0.5M H 2 SO4
8. The normality of 2.3 M H 2 SO4 solution is
(1) 2.3 N (2) 4.6 N 18. What volume of 0.8 M solution contains 0.1
(3) 0.46 N (4) 0.23 N mole of the solute
9. 2.0 molar solution is obtained , when 0.5 mole (1) 100 ml (2) 125 ml
solute is dissolved in (3) 500 ml (4) 62.5 ml
(1) 250 ml solvent (2) 250 g solvent
19. Conc. H 2 SO4 has a density of 1.98 gm/ml and
(3) 250 ml solution (4) 1000 ml solvent
10. How many gram of HCl will be present in is 98% H 2 SO4 by weight. Its normality is
150 ml of its 0.52 M solution (1) 2 N (2) 19.8 N
(1) 2.84 gm (2) 5.70 gm (3) 39.6 N (4) 98 N
(3) 8.50 gm (4) 3.65 gm 20. With 63 gm of oxalic acid dihydrate ,how
11. The number of moles present in 2 litre of 0.5 N
many litres of 10 solution can be prepared
M NaOH is
(1) 0.5 (2) 0.1 (3) 1 (4) 2 (1) 100 litre (2) 10 litre
(3) 1 litre (4) 1000 litre

E Your Hard Work Leads to Strong Foundation 11

 TARGET : PRE-MEDICAL 2020 CHEMISTRY
21. Molarity of 0.2 N H 2 SO4 is 28. 10 grams of a solute is dissolved in 90 grams
(1) 0.2 (2) 0.4 (3) 0.6 (4) 0.1 of a solvent. Its mass percent in solution is
22. 20 g of hydrogen is present in 5 litre vessel. (1) 0.01 (2) 11.1 (3) 10 (4) 9
The molar concentration of hydrogen is 29. An aqueous solution of glucose is 10% (w/v).
(1) 4 (2) 1 (3) 3 (4) 2 The volume in which 1 mole of it is dissolved
23. To prepare a solution of concentration of 0.03 will be
(1) 18 litre (2) 9 litre
g/ml of AgNO3 , what amount of AgNO3 should
(3) 0.9 litre (4) 1.8 litre
be added in 60 ml of solution
30. 6 .02 ´ 10 20 molecules of urea are present in 100
(1) 1.8g (2) 0.8g
ml of its solution. The concentration of urea
(3) 0.18g (4) None of these
solution is
24. How many grams of dibasic acid (mol. wt. 200)
(1) 0.02 M (2) 0.01 M
should be present in 100ml of its aqueous so-
(3) 0.001 M (4) 0.1 M
lution to give decinormal strength
(1) 1g (2) 2 g (3) 10 g (4) 20 g (Avogadro constant, N A = 6.02 ´ 10 23 mol -1 )

25. The weight of pure NaOH required to prepare 31. What is molarity of a solution of HClwhich con-
tains 49% by weight of solute and whose spe-
250cm 3 of 0.1 N solution is
cific gravity is 1.41
(1) 4 g (2) 1g (3) 2 g (4) 10 g
(1) 15.25 (2) 16.75
26. Which of the following concentration factor is
(3) 18.92 (4) 20.08
affected by change in temperature
(1) Molarity 32. When 7.1gm Na2 SO4 (molecular mass 142) dis-
(2) Molality solves in water to make a 100ml solution, the
(3) Mole fraction molarity of the solution is
(4) Weight fraction (1) 2.0 M (2) 1.0 M
(3) 0.5 M (4) 0.05 M
27. The molarity of a solution of Na2 CO3 having
33. The normality of 10% (weight/volume) acetic
10.6 g / 500ml of solution is
acid is
(1) 0.2M (2) 2M (1) 1 N (2) 10 N
(3) 20 M (4) 0.02M (3) 1.7 N (4) 0.83 N

ANSWER K EY
Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Ans 4 2 2 1 4 2 1 2 3 1 3 1 2 3 3

Que. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Ans 1 3 2 3 2 4 4 1 1 2 1 1 3 4 2
Que. 31 32 33
Ans 3 3 3
12 Your Hard Work Leads to Strong Foundation E
 TARGET : PRE-MEDICAL 2020
NURTURE COURSE
(RACE # 07)
TOPIC NAME : CONCENTRATION TERMS CHEMISTRY
1. A mixture has 18g water and 414g ethanol. 7. Mole fraction (X ) of any solution is equal to
The mole fraction of water in mixture is : No. of moles of solute
(1) Volume of solution in litre
(1) 0.1 (2) 0.4 (3) 0.7 (4) 0.9
2. Which statement is true for solution of 0.020 No. of gram equivalent of solute
(2) Volume of solution in litre
M H 2 SO4
No. of moles of solute
(1) 2 litre of the solution contains 0.020 mole (3) Mass of solvent in kg
of SO42-
No. of moles of any constituen t
(4) Total no. of moles of all constituen ts
(2) 2 litre of the solution contains 0.080 mole
of H 3 O + 8. The molality of 90%(w/v) H2SO4 solution is
[density=1.8 gm/ml]
(3) 1 litre of the solution contains 0.020
mole H 3 O + (1) 1.8 (2) 48.4 (3) 10.2 (4) 94.6
9. What is the molality of a solution which
(4) None of these
contains 18 g of glucose (C6 H12O6 ) in 250 g of
3. With increase of temperature, which of these water
changes
(1) 4.0 m (2) 0.4 m (3) 4.2 m (4) 0.8 m
(1) Molality
10. 1000 gms aqueous solution of CaCO3 contains
(2) Weight fraction of solute 10 gms of carbonate. Concentration of the
(3) Normality solution is

(4) Mole fraction (1) 10 ppm (2) 100 ppm

(3) 1000 ppm (4) 10000 ppm
4. What will be the molality of a solution having
18 g of glucose (mol. wt. = 180) dissolved in 11. 3.65 gms of HCl is dissolved in 16.2 gms of
500 g of water water. The mole fraction of HCl in the resulting
solution is
(1) 1m (2) 0.5 m (3) 0.2 m (4) 2 m (1) 0.4 (2) 0.3 (3) 0.2 (4) 0.1
5. The mole fraction of the solute in one molal 12. When 1.80 gm glucose dissolve in 90 gm of
aqueous solution is
H 2O , the mole fraction of glucose is
(1) 0.027 (2) 0.036
(1) 0.00399 (2) 0.00199
(3) 0.018 (4) 0.009 (3) 0.0199 (4) 0.998
6. The mole fraction of water in 20%(w/w) 13. In a solution of 7.8 gm benzene ( C6 H 6 ) and
aqueous solution of H 2 O2 is
46.0 gm toluene (C6 H 5 CH 3 ) , the mole fraction

77 68 20 80 of benzene in this solution is

(1) 68 (2) 77 (3) 80 (4) 20
(1) 1 / 6 (2) 1 / 5 (3) 1 / 2 (4) 1 / 3

E Your Hard Work Leads to Strong Foundation 13

 TARGET : PRE-MEDICAL 2020 CHEMISTRY
14. A solution contains 25%H 2 O , 25%C 2 H 5 OH and 20. The mole fraction of a given sample of I2 in
50% CH 3 COOH by mass. The mole fraction of
C6H6 is 0.2. The molality of I2 in C6H6 is :
(1) 0.32 (2) 3.2
H 2O would be
(3) 0.032 (4) 0.48
(1) 0.25 (2) 2.5 (3) 0.503 (4) 5.03
21. Mole fraction of CH3OH in mixture containing
15. If 5.0 gm of BaCl2 is present in 106 gm solution, CH 3 OH and C 2 H 5 OH is 0.5. Hence mass
the concentration is percentage of CH3OH in the mixture is
(1) 1 ppm (2) 5 ppm (1) 41% (2) 59% (3) 50% (4) 25%
(3) 50 ppm (4) 1000 ppm 22. Find molality of 36.5%(w/v) HCl in 1 litre
16. An X molal solution of a compound in benzene solution. The density of solution is 1.84 g/mL ?
has mole fraction of solute equal to 0.2. The (1) 11.4 (2) 12.5
value of X is (3) 6.77 (4) 9.5
(1) 14 (2) 3.2 (3) 4 (4) 2 23. Molarity of liquid HCl with density equal to
1.17 g/cc is
17. If we take 44 g of CO2 and 14 g of N 2 what will
(1) 36.5 (2) 18.25
be mole fraction of CO2 in the mixture
(3) 32.05 (4) 4.65
(1) 1/5 (2) 1/3
24. A 500 g toothpaste sample has 0.2 g fluoride
(3) 2/3 (4) ¼ concentration. What is the concentration of
18. Density of 3M Na2CO3 solution in water is 1.2 fluorine in terms of ppm level ?
g mL–1. The percentage by weight and ppm of (1) 250 (2) 200
Na2CO3 are respectively
(3) 400 (4) 1000
(1) 26.5 and 2.65 × 105
25. The molality of a sulphuric acid solution in
(2) 2.65 and 2.65 × 104 which the mole fraction of water is 0.85, is
(3) 265 and 2.65 × 103 (1) 9.80 (2) 10.50
(4) 5.23 and 2.65 × 106 (3) 10.58 (4) 11.25
19. Mole fraction of methanol in its aqueous 26. 30 mL of a diabasic acid is neutralized by 15
solution is 0.5. The concentration of solution mL of 0.2 N NaOH. The molarity of the acid is
in terms of percent by mass of methanol is (1) 0.05 M (2) 0.2 M
(1) 36 (2) 50 (3) 64 (4) 72 (3) 0.3 M (4) 0.4 M

ANSWER KEY
Que. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Ans 1 2 3 3 3 2 4 3 2 4 4 2 1 3 2
Que. 16 17 18 19 20 21 22 23 24 25 26
Ans 2 3 1 3 2 1 3 3 3 1 1

E Your Hard Work Leads to Strong Foundation 14

 TARGET : PRE-MEDICAL 2020
NURTURE COURSE
(RACE # 08)
TOPIC NAME : LIMITING REAGENT CHEMISTRY
1. 3 gm of Mg is burnt in a closed vessel contain- 8. If 30 mL of H2 and 20 mL of O2 react to form
ing 3 gm of oxygen,. The weight of excess water, what is left at the end of the reaction ?
reactant left is-
(1) 10 mL of H2 (2) 5 mL of H2
(1) 0.5 gm of oxygen (2) 1.0 gm of oxygen
(3) 1.0 gm of Mg (4) 0.5 gm of Mg (3) 10 mL of O2 (4) 5 mL of O2
2. From 2 g of magnesium and 2 g of sulphur by 9. A mixture containing 100 gm H2 and 100 gm
the reaction Mg + S ¾® MgS how much MgS O2 is ignited so that water is formed according
is obtained ? to the reaction, 2H2 + O2 ® 2H2O; how much
(1) 4.5 g (2) 4.3 g water will be formed -
(3) 3.52 g (4) None of these
3. 80 g of H2 are reacted with 80 g of O2 to form (1) 112.5 gm (2) 50 gm
water. Which substance is the limiting reagent? (3) 25 gm (4) 200 gm
(1) H2 (2) O2
10. 0.5 mole of H2SO4 is mixed with 0.2 mole of
(3) H2 O (4) None of these
Ca (OH)2. The maximum number of moles of
4. 3g of H2 react with 29 g of O2 to form H2 O
CaSO4 formed is -
find the amount of the reactant left unreacted ?
(1) 6g (2) 8 g (1) 0.2 (2) 0.5
(3) 5.7 g (4) 5 g (3) 0.4 (4) 1.5
5. One litre of oxygen at STP is made to react
11. 12 litre of H2 and 11.2 litre of Cl2 are mixed
with three litres of carbon monoxide at STP.
and exploded. The composition by volume of
Which one is limiting reactant ?
mixture is-
(1) CO (2) O2
(3) CO2 (4) None of these (1) 24 litre of HCl
6. If 0.30 mole Zn are added to HCl containing
(2) 0.8 litre Cl2 and 20.8 lit HCl.
0.52 mole of HCl, How many moles of H2 are
produced, according to the reaction (3) 0.8 litre H2 & 22.4 litre HCl
Zn(s) + 2HCl(aq.) ¾® ZnCl2(aq.) + H2(g) (4) 22.4 litre HCl
(1) 1 mole (2) 2 mole
12. For the reaction : A + 2B ® C
(3) 0.8 mole (4) 0.26 mole
7. 20 moles of A and 14 moles of B are mixed and 5 mole of A and 8 mole of B will produce -
allowed to react according to the equation : (1) 5 mole of C
A + 2B ® 3C
What is the maximum number of moles of C (2) 4 mole of C
which could be prepared ? (3) 8 mole of C
(1) 14 (2) 21 (3) 13 (4) 7
(4) 13 mole of C

ANSWER KEY
Que. 1 2 3 4 5 6 7 8 9 10 11 12
Ans 2 3 2 4 2 4 2 4 1 1 3 2

E Your Hard Work Leads to Strong Foundation 15