1.7.5 grams of a gas occupy 5.6 litres of volume at STP. The gas is

a) \[N_{2}O\]

b) NO

c) CO

d) \[CO_{2}\]

Explanation:

2. 1 amu is equal to

a) \[\frac{1}{14} of O-16\]

b) \[\frac{1}{12} of C-12\]

c) \[1g of H_{2}\]

d) \[1.66 × 10^{-23}kg\]

Explanation: 1 amu = \[\frac{1}{12}\] of the mass of C-12

3. Which of the following contains maximum number of atoms?

a) \[6.023 × 10^{21}molecules ofCO_{2}\]

b) 0.44 g of \[CO_{2}\]

c) 22.4 L of \[CO_{2}\] at STP

d) None of these

Explanation: 22.4 L of CO

_{2}at STP = 1 mole = 6.023 × 10

^{23}molecules. Hence number of atoms 3 × 6.023 × 10

^{23}

4. Number of g of oxygen in 32.2 g \[Na_{2}SO_{4}.10H_{2}O\] is

a) 20.8

b) 2.24

c) 22.4

d) 2.08

Explanation: M. Wt of Na

_{2}SO

_{4}.10 H

_{2}O is 322 g which contains 224 g oxygen.

32.2 g will contain 22.4 g oxygen

5. The specific heat of a metal is 0.16, its approximate atomic weight would be

a) 32

b) 16

c) 64

d) 40

Explanation:

6. The weight of a molecule of the compound \[C_{60}H_{122}\] is

a) \[1.09 × 10^{-21}g\]

b) \[1.4 × 10^{-21}g\]

c) \[5.025 × 10^{23}g\]

d) \[16.023 × 10^{23}g\]

Explanation:

7. The number of water molecules present in a drop of water (volume 0.0018 ml) density = \[18 ml^{-1}\] at room temperature is

a)\[1.084 × 10^{18}\]

b) \[6.023 × 10^{19}\]

c) \[4.84 × 10^{17}\]

d) \[6.023 × 10^{23}\]

Explanation:

8. The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight = 78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is

a) \[1.568 × 10^{3}\]

b) \[1.568 × 10^{4}\]

c) 15.68

d) \[3.136 × 10^{4}\]

Explanation:

9. Equivalent weight of crystalline oxalic acid is

a) 90

b) 53

c) 63

d) 45

Explanation:

10. 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) 3.325

b) 33.25

c) 12

d) 20

Explanation: