Untitled Document

Question Bank No: 1

1. The molar concentration of ${Cl}^{-}$ ions in a solution obtained by mixing 300mL of 0.3 MNaCl and 200 mL of 0.4 M BaC $l_{2}$ is

a)		0.9 M
b)		1.5 M
c)		0.25 M
d)		0.5 M

2. If molecular mass of KMn $O_{4}$ is M and it is converted to $K_{2} Mn O_{4}$ is a chemical reaction.The equivalent mass is KMn $O_{4}$ will be

a)		M
b)		M/3
c)		M/5
d)		M/7

3. The molecular formula of certain compound is $M_{4} O_{6}$ If 18.88 g of the compound contains 10 g of M,the atomic mass of M is approximately

a)		40 g
b)		54 g
c)		27 g
d)		12 g

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

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

5. Which of the following will occupy a volume of 1.12 L at S.T.P.?

a)		0.5 mol of nitrogen gas
b)		3.01 $\times 10^{21}$ nitrogen atoms
c)		3.01 $\times 10^{22}$ $N_{2}$ molecules
d)		1g of $H_{2}$ gas

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

a)		11.1g of ${CaCl}_{2}$
b)		0.1 mol of $Kl$
c)		0.1 mol of $AIP O_{4}$
d)		0.1 mol of $SrC O_{3}$

7. Which of the following is correct?

a)		1L=1d $m^{2}$
b)		1L=10d $m^{2}$
c)		10L=1d $m^{3}$
d)		1L=1 $m^{3}$

8. On dividing 0.86 by 16.564, the actual answer is 0.0519198.The correctly reported answer will be

a)		0.05
b)		0.051
c)		0.0519
d)		0.05191

9. The realtive abundance of two isotopes of atomic mass 85 and 87 is 75% respectively.The average atomic mass of element is

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

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

a)		0.1mol of ${CO}_{2}$ gas
b)		11.2 L of ${CO}_{2}$ gas t NTP
c)		22 g of ${CO}_{2}$ gas
d)		22.4 $\times$ 113 ml of CO2 gas

11. What quantity of limestone (CaCO3) on heating will give 56 kg of CaO?

a)		1000 kg
b)		56 kg
c)		44 kg
d)		100 kg

12. If 8.4 gm of hexane burns completely in oxygen,how many moles of ${CO}_{2}$ is produced?

a)		6
b)		0.6
c)		0.9
d)		1.2

13. 40 g of CaC $O_{2} (s)$ was treated with 48 g of HCl .If the acid used was only 30% strength the approximate amount of CaC $O_{3}$ unreacted is

a)		17 g
b)		20g
c)		30g
d)		32g

14. One mole of ${CO}_{2}$ contains

a)		6.02 $\times 10^{23}$ atoms C
b)		6.02 $\times 10^{23}$ atoms O
c)		18.1 $\times 10^{23}$ molecules of C $O_{2}$
d)		3gm atoms of ${CO}_{2}$

15. What volume of ${CO}_{2}$ will be liberated at NTP when 1.2.gm of carbon is burnt in excess of oxygen?

a)		11.2 litres
b)		22.4 litres
c)		2.24 litres
d)		1.12 litres

16. A compound possesses 8% sulphur by mass. The least molecular mass is

a)		200
b)		400
c)		155
d)		355

17. The weight of one molecule of a compound $C_{60} H_{122}$ is

a)		$1.3 \times 10^{- 20} g$
b)		$5.01 \times 10^{- 21} g$
c)		$3.72 \times 10^{23} g$
d)		$1.4 \times 10^{- 21} g$

18. How many atoms are contained in one mole of sucrose ( $C_{12} H_{22} O_{11}$ )?

a)		$45 \times 6.02 \times 10^{23} atoms / mole$
b)		$5 \times 6.62 \times 10^{23} atoms / mole$
c)		$5 \times 6.02 \times 10^{23} atoms / mole$
d)		none of these

19. Irrespective of the source, pure sample of water always yields 88.89% mass of

a)		conservation of mass
b)		constant composition
c)		multiple proportions
d)		constant volume

20. The set of numerical coefficients that balances the chemical equation $K_{2} {CrO}_{4} + HCl \to$ $K_{2} {Cr}_{2} O_{7} + KCl + H_{2} O$

a)		1,1,2,2,1
b)		2,2,1,1,1
c)		2,1,1,2,1
d)		2,2,1,2,1

21. The mass of 112 ${cm}^{3}$ of ${CH}_{4}$ gas at STP is

a)		0.16 g
b)		0.8 g
c)		0.08 g
d)		1.6 g

22. The empirical formula of an acid is ${CH}_{2} O_{2}$ , the probable molecular formula of acid may be

a)		${CH}_{2} O$
b)		${CH}_{2} O_{2}$
c)		$C_{2} H_{4} O_{2}$
d)		$C_{3} H_{6} O_{4}$

23. Vapour density of a gas is 22. What is its molecular mass?

a)		33
b)		22
c)		44
d)		11

24. In the following reaction, which choice has value twice that of the equivalent massof the oxidising agent ${SO}_{2} + H_{2} O \to 3 S + 2 H_{2} O$

a)		64
b)		32
c)		16
d)		48

25. Assuming full decomposition , the volume of ${CO}_{2}$ released at STP on heating 9.85 g of ${BaCO}_{3}$ (At. mass Ba = 137)will be

a)		0.84L
b)		0.24L
c)		4.06L
d)		1.12L

26. The hydrogen phosphate of certain metal has formula ${MHPO}_{4}$ . The formula of metal chloride would be

a)		MCl
b)		${MCl}_{2}$
c)		$M_{2} {Cl}_{2}$
d)		${MCl}_{3}$

27. The total number of gm-molecules of ${SO}_{2} {Cl}_{2}$ in 13.5g of sulphuryl chloride is

a)		0.1
b)		0.2
c)		0.3
d)		0.4