DPP – 01

BATCH - DSSSB
CAREERWILL SUB – CHEMISTRY
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CHAPTER:– MOLE CONCEPT TOPIC:– QUESTION BASED ON CHAPTER DATE:– 07/04/23

1. 1 mole by definition represents same number of particles as :

16 16
(a) Number of atoms present in exactly 8 g of O isotope./ O 8g
8 8

(b) Number of molecules in exactly 2 g of H2 gas./ 2 g H2

16 16
(c) Number of atoms present in exactly 16 g of O isotope./ O 16 g
8 8

12 12
(d) Number of atoms present in exactly 12 g of C isotope./ C 12 g
6 6

2. The weight of a molecule of the compound C6H12O6 is about :

C6H12O6
(a) 180 g (b) 3 × 10–22 g
(c) 22 × 10–23 g (d) 132 g
3. The mass of half mole of electrons is about : (Given : Mass of electron = 9.1 × 10 –28 g)
= 9.1 × 10–28 g)
(a) 0.546 mg (b) 0.273 mg
(c) 1.092 mg (d) 4.55 mg
4. 39.4 kg of gold was recovered from a smuggler. The number of atoms of gold recovered are :
39.4 kg
(a) 200 (b) 1.2044 × 1025
(c) 6.022 × 1025 (d) 1.2044 × 1026
5. The charge on 1 gram of Al3+ ions is : (e = magnitude of electronic charge)
Al3+ (e = )
1 1 1 1
(a) NA e coulomb/ NA e (b) NA e coulomb/ NA e
27 27 3 3
1 1
(c) NA e coulomb / NA e (d) 3 NAe coulomb/3 NAe
9 9
6. The number of atoms present in 0.5 g atoms of nitrogen is same as the atoms in :
0.5 g
(a) 24g of Mg/24g
(b) 8g of Oxygen gas/8g
(c) 32g of S/32g
(d) 12g of C/12g
7. In which of the following pairs, do 1 g of each have an equal number of molecules ?

(a) N2O and CO/N2O CO (b) N2 and CO/N2 CO

(c) N2O and CO2/N2O CO2 (d) Both (B) and (C)/(B) (C)
8. The number of atoms in 4.25 g of NH3 is approximately :
NH3 4.25 g
(a) 1 × 1023 (b) 2 × 1023
(c) 4 × 1023 (d) 6 × 1023
9. Total number of neutrons present in 4 g of heavy water (D2O) is : (Where NA represents Avogadro's
number)
(D2O) 4g NA
(a) 2.4 NA (b) 4 NA
(c) 1.2 NA (d) 2 NA
10. In which of the following options, the molecules are correctly matched with their atomicity ?

(a) (1 – s), (2 – r), (3 – p), (4 – q) (b) (1 – q), (2 – s), (3 – p), (4 – r)

(c) (1 – q), (2 – s), (3 – r), (4 – p) (d) (1 – s), (2 – r), (3 – q), (4 – p)
11. The atomic weight of an element is 'a'. If this element occurs in nature as a triatomic gas, then the
correct formula for the number of moles of gas in its 'w' g is :
'a'
'w'
3w w
(a) (b)
a 3a
a
(c) 3wa (d)
3w
12. 124 g of P4 will contain which of the following :
124 g P4
(1) 4 atoms of Phosphorus/
(2) 4NA atoms of Phosphorus/ 4NA
(3) NA molecules of Phosphorus/ NA
(4) 1 molecule of Phosphorus/
(a) 1 and 4/ (b) 2 and 3/
(c) 1 and 3/ (d) 2 and 4/
13. Among the following samples, select the sample which contains maximum number of atoms.

(a) 4 gm of oxygen/
(b) 32 gm of sulphur/
(c) 108 gm of silver/
(d) 2 gm atoms of nitrogen/
14. A gaseous mixture contains oxygen and sulphur dioxide in the ratio of 1 : 4 by mass. Therefore, the ratio
of their respective number of molecules is :

(a) 1 : 2 (b) 1 : 4
(c) 2 : 1 (d) 4 : 1
15. Sulphur exist in different allotropic forms like S2, S6 and S8 etc. If equal moles of these three forms are
taken in separate containers, then the ratio of number of atoms present in them respectively is :
S2, S6 S8

(a) 1 : 3 : 4 (b) 1:1:1

(c) 12 : 4 : 3 (d) 4:3:1
16. Which of the following has least mass?

(a) 2 gram-atom of Nitrogen/

(b) 3 × 1023 atoms of Carbon/ 3 × 1023
(c) 1 mole of Sulphur atoms/
(d) 7 g of Silver/ 7g
17. Which of the following has least mass?

(a) 2 gram-molecules of CO2/CO2

(b) 1.2044 × 1024 molecules of CH3COOH/CH3COOH 1.2044 × 1024
(c) 3 moles of NH2CONH2/NH2CONH2
(d) 80 g of CaCO3/CaCO3 80 g
18. Which of the following contains the greatest number of atoms?

(a) 1 g of butane (C4H10)/ (C4H10) 1g

(b) 1 g of nitrogen (N2)/ (N2) 1g
(c) 1 g of silver (Ag)/ (Ag) 1g
(d) 1 g of water (H2O)/ (H2O) 1g
19. Cinnabar (HgS) is a prominent ore of mercury. How many grams of mercury are present in 464g of pure
HgS.
(HgS), HgS
(a) 200 g (b) 400 g
(c) 160 g (d) None of these
20. The number of F ions in 2.1g AlF3 is (NA= 6 × 10 )
– 23

2.1g AlF3 F– (NA= 6 × 1023)

(a) 1.5 × 1022 (b) 6 × 1022
(c) 3 × 10 22
(d) 4.5 × 1022