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Question Bank No: 1

1. On reduction with hydrogen 3.6g of an oxide of metal leaves 3.2g of metallic residue. If the atomic mass of metal is 64, the formula of metal oxide is

a)		$M_{2} O_{3}$
b)		$M_{2} O$
c)		MO
d)		M $O_{2}$

2. The mass of Ca ${CO}_{3}$ formed by passig ${CO}_{2}$ gas through 50ml of 0.5 M Ca ${(OH)}_{2}$ solution is

a)		10g
b)		2g
c)		2.5g
d)		5g

3. The conversion of oxygen to ozone occurs to the extent of 15% only. The mass of ozone that can be prepared from 67.2L of oxygen at N.T.P will be

a)		14.4 g
b)		96 g
c)		640 g
d)		64 g

4. 200 mL of given sample of hydrogen peroxide solution on analysis is found to contain 136mg of $H_{2} O_{2}$ . The molarity of the solution is

a)		M/50
b)		M/5
c)		2M
d)		20M

5. Which of the following will not have a mass of 10g?

a)		0.1 mol of Ca ${CO}_{3}$
b)		0.51 $\times 10^{23}$ ${Ca}^{2 +}$ ions
c)		0.016 mol of ${CO}_{3}^{2 -}$
d)		7.525 $\times 10^{22}$ Br atom

6. Which of the following represents 1g- molecule of the substance?

a)		6.02 $\times 10^{24}$ molecules of ${NH}_{3}$
b)		4g of helium
c)		40g of calcium oxide
d)		127g of iodine

7. What is not correct regarding 22g of ${CO}_{2}$ ?

a)		It occupies always 11.2 L of volume
b)		It corresponds to 1/2 mol of ${CO}_{2}$
c)		It contains one gm atom of oxygen
d)		It contains 0.5g of carbon

8. Which pair of species will have equal volumes of S.T.P.?

a)		12.8g of ${SO}_{2}$ and 0.5 mol of N $O_{2}$
b)		6.02 $\times 10^{22}$ S $O_{2}$ molecules and 0.1 mole of solid carbon
c)		6.02 $\times 10^{23}$ $O_{2}$ molecules and 0.1 mole of $N_{2}$ gas
d)		1g molecule of C $O_{2}$ and 71g of ${Cl}_{2}$

9. Two flasks of equal capacity contain argon and chlorine gases respectively at room temperature. What is true about them?

a)		Both contain same number of atoms
b)		Cl atoms are half of the Ar atoms
c)		Cl atoms are double the number of Ar atoms
d)		Chlorine molecules are double the number of argon molecules

10. If $H_{2} S O_{4}$ ionises as $H_{2} {SO}_{4} + 2 H_{2} O \to 2 H_{3} O^{+} + S O_{4}^{2 -}$ . Then total number of ions in 20ml of 0.1 M $H_{2} {SO}_{4}$ solution are

a)		3.0 $\times 10^{24}$
b)		3.612 $\times 10^{21}$
c)		3.612 $\times 10^{23}$
d)		0.1 mol of ions

11. The mass of carbon (II) oxide which contains 6.02 $\times 10^{23}$ oxygen atoms is

a)		2.8g
b)		28g
c)		14g
d)		1.4g

12. The number of oxygen atoms in 0.2 mole of decahydrate sodium carbonate is

a)		1.56 $\times 10^{24}$
b)		1.56 $\times 10^{23}$
c)		1.56 $\times 10^{25}$
d)		3.12 $\times 10^{24}$

13. The correct arrangement of the following in order of increasing mass is
I. nitrogen molecule
II. oxygen molecule
III. 1 avogram
IV. 1 $\times 10^{- 10}$ g-atom of copper

a)		I >II> III>IV
b)		I <II<III<IV
c)		III<II<I<IV
d)		II<III<I<IV

14. The mole percent of oxygen present in gasous mixture containing 14.0g nitrogen and 32g oxygen is

a)		50
b)		33.3
c)		66.6
d)		40

15. Which of the following illustrates the law of conservation of mass?

a)		Mixing of 10g of sulphur and 2 g of sand does not show a change in mass
b)		The mass of platinum wire brfore and after heating remains constant
c)		2.2g of propane and 8g of oxygen produces 10.2g of gaseous mixture
d)		2.8g of CO and 1.6g of oxygen gave only 2.24L of ${CO}_{2}$ at S.T.P

16. In alkaline conditions KMn $O_{4}$ reacts as 2KMn $O_{4}$ +2KOH $\to K_{2} Mn O_{4} + H_{2} O$ + $[O]$ . The equivalent mass of KMn $O_{4}$ is

a)		31.6
b)		52.7
c)		49
d)		158