E in Which the Same Amount of Element X, Y Is Present in the Ratio 1 : 2 : 3 : 4 : 5

1. Two elements X and y have atomic weights of 14 and 16. They form a series of compounds A, B, C, D and

E in which the same amount of element X, Y is present in the ratio 1 : 2 : 3 : 4 : 5. If the compound A has

28 parts by weight of X and 16 parts by weight of Y, then the compound of C will have 28 parts weight of X and

(a) 32 parts by weight of Y (b) 48 parts by weight of Y

(c) 64 parts by weight of Y (d) 80 parts by weight of Y A B C D

2. Which of the following is the best example of law of conservation of mass

(a) 12 g of carbon combines with 32 g of oxygen to form 44 g of CO2

(b) When 12 g of carbon is heated in a vacuum there is no change in mass

(c) A simple of air increases in volume when heated at constant pressure but its mass

remains unaltered

(d) The weight of a piece of platinum is the same before and after heating in air A B C D

3. In compound A, 1.00 g nitrogen unites with 0.57 g oxygen. In compound B, 2.00 g nitrogen combines

with 2.24 g oxygen. In compound C, 3.00 g nitrogen combines with 5.11 g oxygen. These results obey

the following law

(a) Law of constant proportion (b) Law of multiple proportion

(c) Law of reciprocal proportion (d) Dalton's law of partial pressure. A B C D

4. What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene

(a) 2.8 kg (b) 6.4 kg (c) 9.6 kg (d) 96 kg A B C D

5. The number of hydrogen atoms present in 25.6g of sucrose (C12H22O11) which has a molar mass of 342.3 g is

(a) 22 x 1023 (b) 9.91 x 1023 (c) 11 x 1023 (d) 44 x 1023 H atoms A B C D

6. Which one of the following is the lightest.

(a) 0.2 mole of hydrogen gas (b) 6.023 x 1022molecules of nitrogen

(c) 0.1 g of silver (d) 0.1mole of oxygen gas (e) 1 g of water A B C D

7. The number of water molecules present in a drop of water (volume 0.0018ml)at room temperature is

(a) 6.023 x 1019 (b) 1.084 x 1018 (c) 4.84 x 1017 (d) 6.023 x 23 A B C D

8. The incorrect statement for 14 g of CO is

(a) It occupies 2.24 litre at NTP (b) It corresponds to mole of CO

(c) It corresponds to same mole of CO and N2 (d) It corresponds to 3.01 x 1023 molecules of CO A B C D

9. The number of water molecules in 1 litre of water is

(a) 18 (b) 18 x 1000 (c) NA (d) 55.55NA A B C D

10. The total number of gm-molecules of SO2CI2 in 13.5g of sulphuryl chloride is

(a) 0.1 (b) 0.2 (c) 0.3 (d) 0.4 A B C D

11. How many moles of lead (II) chloride will be formed from a reaction between 6.5g of PbO and 3.2g of HCI

(a) 0.011 (b) 0.029 (c) 0.044 (d) 0.333 A B C D

12. How many atoms are contained in one mole of sucrose (C12H22O11)

(a) 45 x 6.02 1023 atoms/mole (b) 5 x 6.62 x 1023 atoms/mole

(c) 5 x 6.02 x 1023 toms/mole (d) None of these A B C D

13. The number of sodium atoms in 2moles of sodium ferrocyanide is

(a) 12 x 1023 (b) 26 x 1023 (c) 34 x 1023 (d) 48 x 1023 A B C D

14. 1 mole of methyl amine on reaction with nitrous acid gives at N.T.P

(a) 1.0 litre of nitrogen (b) 22.4 Litre of nitrogen

(c) 11.2 Litre of nitrogen (d) 5.6 Litre nitrogen A B C D

15. The number of formula units of calcium fluoride CaF2 present in 146.4 g of CaF2 (The molar mass of

CaF2 is 78.08 g.mol)is

(a) 1.129 x 1024 CaF2 (b) 1.146 x 1024CaF2

(c) 7.808 x 1024CaF2 (d) 1.877x 1024CaF2 A B C D

16. Common salt obtained from sea-water contains 95% NaCI by mass. The approximate number of molecules

present in 10.0 g of the salt is

(a) 1021 (b) 1022 (c) 1023 (d) 1024 A B C D

17. The molecules present in 5.6l, of sulphur dioxide at STP is

(a) 1.5 x 1027 (b) 1.5 x 10-27 (c) 4 x 1023 (d) 0.15 x 1023 A B C D

18. In an experiment, 4g of M2O4 oxide was reduced to 2.8gof the metal. If the atomic mass of the metal is

56g mol-1, the number of O atoms in the oxide is

(a) 1 (b) 2 (c) 3 (d) 4 A B C D

19. Avogadro number (6.023 x 1023) of carbon atoms are present in

(a) 12 grams of 12CO2 (b) 22.4 litre 12CO2 in room temperature

(c) 44 grams of 12CO2 (d) 12 moles of 12CO2 A B C D

20. When 22.4 litres of H2(g)is mixed with 11.2 litres of CI2(g),each at STP, the moles of HCI(g) formed is a equal to

(a) 0.5 mol of HCI(g) (b) 1.5 mol of HCI(g)

(c) 1 mol of HCI(g) (d) 2 mol of HCI(g) A B C D

21. An organic compound contains carbon, hydrogen and oxygen Its elemental analysis gave C, 38.71%

and H, 9.67% and O, 51.62%. The empirical formula of the compound would be

(a) CHO (b) CH4O (c) CH3O (d) CH2O A B C D

22. A compound (80g) on analysis gave C = 24g, H = 4 g, O = 32g. Its empirical formula is

(a) C2H2O2 (b) C2H2O (c) CH2O2 (d) CH2O A B C D

23. A compound contains 69.5%oxygen and 30.5%nitrogen and its molecular weight is 92. The formula of

the compound is

(a) N2O (b) NO2 (c) N2O4 (d) N2O5 A B C D

24. Percent composition of an organic compound A is, carbon 85.71%and hydrogen 14.29%. Its vapour

density is14 Consider the following reaction:

identify C

(a) CH3 - CH - CO2H (b) HO - CH2 -CH2 - CO2H

OH

(c) HO - CH2 - CO2H (d) CH3 - CH2 - CO2H A B C D

25. What weight of SO2 can be made by burning sulphur in 5.0 moles of oxygen

(a) 640 grams (b) 160grams (c) 80grams (d) 320grams A B C D

26. H2 evolved at STP on complete reaction of 27 g of Aluminium with excess of aqueous NaOH would be

(a) 22.4 (b) 44.8 (c) 67.2 (d) 33.6 A B C D

27. The percentage of P2O5 in diammonium hydrogen phosphates (NH4)2HPO4 is

(a) 23.48 (b) 46.96 (c) 53.78 (d) 71.00 A B C D

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