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Question Bank No: 1

1. Main axis of diatomic molecule is Z. The orbitals $p_{x}$ and $p_{y}$ overlap to form

a)		$π$ molecular orbital
b)		$σ$ molecular orbital
c)		$δ$ molecular orbital
d)		no bond will be formed

2. If the charge on electron is 1.602 x $10^{- 19} C,$ the charge on 0.1 mol of copper 11 ions will be

a)		2 F
b)		1.5 F
c)		0.1 F
d)		0.2 F

3. The number of neutrons in 1.8 g of water will approximately be

a)		40216 x $10^{23}$
b)		8.432 x $10^{23}$
c)		9.632 x $10^{23}$
d)		40216 x $10^{24}$

4. The minimum amount of $H_{2}$ S required to precipitate 6.35g of C $U^{2 +}$ ions from the aqueous solution is

a)		6.25
b)		112.5
c)		102
d)		106.25

5. 0.6 mol of barium chloride in solution is mixed with 0.2 mol of sodium phosphate, the amount of barium phosphate produced is

a)		0.1 mol
b)		0.3 mol
c)		0.4 mol
d)		0.5 mol

6. C-12 and C-14 isotopes are found as 98% and 2% respectively in any sample. Then, the number C-14 atoms in 12 g of the sample will be

a)		1.5 moles atoms
b)		1.032 x $10^{22}$ atoms
c)		2.06 x $10^{21}$ atoms
d)		2g atom

7. Which of the following pairs contain species with same volume under similar conditions?

a)		9.1 x $10^{23}$ molecules of C $O_{2};$ 9.1 X $10^{23}$ He atoms
b)		9.1 x $10^{23}$ oxygen atoms ; 9.1 X $10^{23}$ He atoms
c)		9.1 X $10^{23}$ He atoms ; 9.1 x $10^{23}$ NaCl units
d)		9.1 X $10^{23}$ NaCl units ; 9.1 x $10^{23}$ O atoms

8. 5.6g of potassium hydroxide contains same number of $K^{+}$ ions as are present in

a)		13.8g of potassium carbonate
b)		1.38g of potassium carbonate
c)		500 ml of 0.2 M solution of KOH
d)		74.5 g of Potassium Chloride

9. x L of nitrogen at N.T.P. contains 3 x $10^{22}$ molecules in $\frac{x}{2}$ L of ozone at N.T.P. will be

a)		3 x $10^{22}$
b)		1.5 x $10^{22}$
c)		1.5 x $10^{21}$
d)		1.5 x $10^{11}$

10. Asample of AI $F_{3}$ contains 3 x $10^{25}$ $F^{-}$ ions. The number of A $l^{3 +}$ in the sample would be

a)		3 x $10^{25}$
b)		1 x $10^{25}$
c)		1.5 x $10^{25}$
d)		2 x $10^{25}$

11. Which of the following ionic compound contains largest number of ions?

a)		11.1g of CaC $l_{2}$
b)		0.1 mol of Kl
c)		0.1 mol of AlP $O_{4}$
d)		0.1 mol of Sr C $O_{3}$

12. What is not correct about 1 mol of ethyne?

a)		It contains 2 g-atom of hydrogen
b)		It contains 1.2 x $10^{23}$ C atoms
c)		It weighs 26 g
d)		It contains 24 g of carbon

13. The number of moles of oxygen present in one litre of air if its volume content is 21% at S.T.P. is

a)		9.375 $\times$ $10^{- 3}$
b)		9.375
c)		0.063
d)		0.05

14. Which of the following set illustrates the law of recipocal proportions?

a)		PC $l_{3}$ , HCl, HBr
b)		P $H_{3}$ , $P_{2} O_{3}$ , $P_{2} O_{5}$
c)		P $H_{3}$ , $P_{2} O_{3}$ , $H_{2} S$
d)		P $H_{3}$ , $P_{2} O_{5}$ , $H_{2} O$

15. Which law of chemical combination is illustrated by the following data? 0.5 g of lime stone on heating gave 0.28 g of calcium oxide and 112 mL OF C $O_{2}$ at S.T.P?

a)		Law of definite proportions
b)		Gay Lussac's law
c)		Law of conservation of mass
d)		Law of multiple proportions

16. A mixture of sand and napthalene can be separated by

a)		Fractional crystallisation
b)		Chromatography
c)		Gravity separation
d)		Sublimation

17. Which of the following is correct?

a)		1L = 1 d $m^{3}$
b)		1L = 10 d $m^{3}$
c)		10 L = 1d $m^{3}$
d)		1L = 1 $m^{3}$

18. 0.0833 mol of carbohydrate of empirical formula C $H_{2} O$ contains 1g of Hydrogen.The molecular formula of the carbohydrate is

a)		$C_{5} H_{10} O_{5}$
b)		$C_{3} H_{4} O_{3}$
c)		$C_{12} H_{22} O_{11}$
d)		$C_{6} H_{12} O_{6}$

19. The relative abundance of two isotopes of atomic mass 85 and 87 is 75% and 25% respectively. The average atomic mass of element is

a)		75.5
b)		85.5
c)		40.0
d)		86.0

20. The molarity of pure water (M.Mass 18) is

a)		18.0
b)		36.0
c)		54.0
d)		55.5

21. Which of the following has the smallest number of molecules?

a)		0.1 mol of C $O_{2}$ gas
b)		11.2 L of C $O_{2}$ gas at NTP
c)		22g of C $O_{2}$ gas
d)		22.4 $\times$ $10^{3}$ ml of C $O_{2}$ gas

22. 1 mole of ${CH}_{4}$ contains

a)		${6.02 \times 10}^{23}$ atoms of H
b)		4 g-atom of Hydrogen
c)		${1.81 \times 10}^{23}$ molecules of ${CH}_{4}$
d)		$3 g$ of Carbon

23. Which of the following has least mass?

a)		2 g-atom of Nitrogen
b)		${3 \times 10}^{23}$ atoms of C
c)		1 mole of S
d)		7 g of Ag

24. 12g of Mg (at mass 24) on reacting completely with acid gives $H_{2}$ , the volume of which at STP would be

a)		22.4 L
b)		11.2 L
c)		44.8 L
d)		6.1 L

25. Which of the following has the smallest number of molecules?

a)		0.1 mole of ${CO}_{2}$
b)		$11.2 L$ of ${CO}_{2}$ at NTP
c)		$22 g$ of ${CO}_{2}$
d)		$22.4 \times 10^{3}$ ml of ${CO}_{2}$

26. The number atoms contained in $11.2 L$ of ${SO}_{2}$ at STP

a)		$\frac{3}{2} \times 6.02 \times 10^{23}$
b)		$2 \times 6.02 \times 10^{23}$
c)		$6.02 \times 10^{23}$
d)		$4 \times 6.02 \times 10^{23}$

27. The number of Oxygen atoms in 4.4g of ${CO}_{2}$ is

a)		$1.2 \times 10^{23}$
b)		$6 \times 10^{22}$
c)		$6 \times 10^{23}$
d)		$12 \times 10^{23}$

28. The number of moles of Sodium Oxide in 620g of it is

a)		1 mole
b)		10 moles
c)		18 moles
d)		100 moles

29. 2g of Oxygen contains number of atoms equal to that in

a)		0.5g of Hydrogen
b)		4g of Sulphur
c)		7g of Nitrogen
d)		2.3g of Sodium

30. The number of molecules in 8.96 L of a gas at $0^{0}$ C and 1 atm pressure is

a)		${6.02 \times 10}^{23}$
b)		$12.04 \times 10^{23}$
c)		$18.06 \times 10^{23}$
d)		$24.08 \times 10^{23}$

31. If $N_{A}$ is Avogadro's number, then number of valance electrons in 4.2g of nitride ion, $N^{3 -}$ is

a)		2.4 $N_{A}$
b)		4.2 $N_{A}$
c)		1.6 $N_{A}$
d)		3.2 $N_{A}$

32. The number of atoms in 4.25g of ${NH}_{3}$ is

a)		$1 \times 10^{23}$
b)		$1.5 \times 10^{23}$
c)		$2 \times 10^{23}$
d)		$6 \times 10^{23}$

33. 4.4g of an unknown gas occupies a volume of 2.24L of volume of STP. The gas may be

a)		${CO}_{2}$
b)		$CO$
c)		$O_{2}$
d)		${SO}_{2}$

34. The maximum amount of ${BaSO}_{4}$ precipitated on mixing ${BaCl}_{2} (0.5 M)$ with $H_{2} {SO}_{4} (1 M)$ will correspond to

a)		0.5M
b)		1M
c)		1.5M
d)		2M

35. The volume in litres of ${CO}_{2}$ liberated at STP when 10g of 90% pure limestone heated completely is

a)		22.4
b)		2.24
c)		20.16
d)		2.016

36. An organic compound contains 49.3% Carbon, 6.84% hydrogen, and its vapour density is 73. Molecular formula of compound is

a)		$C_{3} H_{5} O_{2}$
b)		$C_{6} H_{10} O_{4}$
c)		$C_{3} H_{10} O_{2}$
d)		$C_{4} H_{10} O_{2}$

37. Among the following pairs, the one which illustrates the law of multiple proportions is

a)		${NH}_{3,} HCl$
b)		$H_{2} S, {SO}_{2}$
c)		$CuO, {Cu}_{2} O$
d)		${FeCl}_{2,} {FeSO}_{4}$