CLASS : XIth SUBJECT : CHEMISTRY
DATE : DPP No. : 5
Topic :- SOME BASIC CONCEPTS OF CHEMISTRY
1. Which has the maximum number of atoms?
a) 6 g C b) 1 g H2 c) 12 g Mg d)30 g Ca
2. Mixing up of equal volumes of 0.1 𝑀 NaOH and 0.1 𝑀 CH3COOH yields a solution which is:
a) Basic b) Acidic c) Neutral d)None of these
3. If 6.3 g of NaHC𝑂3 are added to 15.0 g CH3COOH solution, the residue is found to weight 18.0 g.
what is the mass of 𝐶𝑂2 released in the reaction?
a) 4.5 g b) 3.3 g c) 2.6 g d)2.8 g
4. 50 mL of an aqueous solution of glucose contains 6.02 × 1022 molecules. The concentration of
solution is:
a) 0.1 𝑀 b) 1.0 𝑀 c) 0.2 𝑀 d)2.0 𝑀
5. Molar concentration of a solution in water is:
a) Always equal to normality of solution
b) More than molality of the solution
c) Equal to molality of the solution
d)Less than the molality of the solution
6. 1 kg of NaOH solution contains 4 g of NaOH. The approximate concentration of the solution is:
a) 1 molar b) 0.1 molar c) Decinormal d)About 0.1 𝑁
7. How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and
3.2 g of HCl?
a) 0.333 b) 0.011 c) 0.029 d)0.044
8. The nature of mixture obtained mixing 50 mL of 0.1 𝑀 H2SO4 and 50 mL of 0.1 𝑀 NaOH is:
a) Acidic b) Basic c) Neutral d)amphoteric
9. Number of electrons in 1.8 mL of H2O is :
a) 6.02 × 1023 b) 3.011 × 1023 c) 0.6022 × 1023 d)60.22 × 1023
10. If a compound contains two oxygen atoms, four carbon atoms and number of hydrogen atom is
double of carbon atoms, the vapour density of it is:
a) 88 b) 44 c) 132 d)72
11. Molecular weight of oxalic acid is 126. The weight of oxalic acid required to neutralise 1000
mL of normal solution of NaOH is:
a) 126 g b) 63 g c) 6.3 g d)12.6 g
12. The number of hydrogen atoms present in 25.6 g of sucrose(C12H22O11) which has a molar
mass of 342.3 g is
a) 22 × 1023 b) 9.91 × 1023 c) 11 × 1023 d)44 × 1023 H atoms
13. Molarity of liquid HCl with density equal to 1.17 g/mL is:
a) 36.5 b) 18.25 c) 32.05 d)4.65
14. If 20 mL of 0.4 N NaOH solution completely neutralizes 40 mL of a dibasic acid, the molarity of
the acid solution is:
a) 0.1 𝑀 b) 0.2 𝑀 c) 0.3 𝑀 d)0.4 𝑀
15. Dissolving 120 g of urea (mol.wt.60) in 1000 g of water gave a solution of density 1.15 g/mL.
The molarity of the solution is:
a) 1.78 𝑀 b) 2.00 𝑀 c) 2.05 𝑀 d)2.22 𝑀
16. Equivalent weight of NH3 as a base is:
a) 17 b) 17/3 c) 1.7 d)17/2
17. KMnO4 reacts with oxalic acid according to the equation
+
2MnO― 2― +
4 +5C2O4 +16H →2Mn
2
+10CO2 +8H2O Here, 20 mL of 0.1 M KMnO4 is equivalent to
a) 20 mL of 0.5 M H2C2O4 b) 50 mL of 0.1 M H2C2O4
c) 50 mL of 0.1 M H2C2O4 d) 20 mL of 0.1 M H2C2O4
18. To prepare a standard solution of a substance, we use:
a) A pipette b) A burette c) Measuring flask d)Measuring cylinder
19. There are two isotopes of an element with atomic mass𝑧. Heavier one has atomic mass 𝑧 + 2
and lighter one has z ―1, the abundance of lighter one is
a) 66.6% b) 69.7% c) 6.67% d)33.3%
20. 3 g of an oxide of a metal is converted to chloride completely and it yielded 5 g of chloride. The
equivalent weight of the metal is
a) 33.25 b) 3.325 c) 12 d)20
