IIT JEE MCQ Quiz Hub

1. If atomic mass of oxygen were taken as 100 the molecular mass of water would be Approximately
6.25
112.5
102
106.25.

2. Among the pairs of compounds given below which pair contains compounds with different percentage of carbon?.
propene and propane
butane and isobutene
acetylene and benzene
propene cyclopropane

3. The balancing of chemical equation is based upon.
Law of combining volumes
Law of multiple proportions
Law of conservation of mass
Law of definite proportion

4. If specific heat of certain element is 0.064. Its approximate atomic mass is200
100
10
20
200

5. The compound AB contains elements A and B in the ratio of 1:35.5 by mass. The mass of B that will be required to react with 2 g of A is
7.1 g
3.55 g
71 g
35.5 g.

6. 0.6 mol of barium chloride in solution is mixed with 0.2 mol of sodium phosphate the amount of barium phosphate produced is
0.1 mol
0.3 mol
0.4 mol
0.5 mol.

7. The mole fraction of solute in 1 molal aqueous solution is
0.0176
1.8
0.05
0.98.

8. If given sample of potassium chlorate is 80% pure then 48 g of oxygen would be produced from
98.0 g of the sample
153.12 g of sample
245 g of sample
122.5 g of sample.

9. A mixture of sand and naphthalene can be separted by.
Fractional crystallisation
Chromatography
Gravity separation
Sublimation

10. 27 g of aluminium will react completely with
8 g of oxygen
24 g of oxygen
16 g of oxygen
48 g of oxygen.

11. Which of the following best explains the law of conservation of mass?
No change in mass is observed when 2.0 g of Mg is heated in vacuum
1.2 g of carbon when burnt in excess if oxygen consumes only 3.2 g of it to form 4.4 g of carbon dioxide
12 g of carbon when heated in limited supply of air produces only 20 g of carbon monoxide
A sample of air in heating does not show any change in mass but volume increases.

12. Vapour density of a metal chloride is 77. The equivalent mass is 3. Its atomic mass would be
3
6
9
12

13. 276 g of silver carbonate on being strongly heated yields a residue weighing.
2.16 g
3.0 g
6.2 g
2.48 g

14. Which of the following does not have same number of atoms?
1 g of oxygen and 1 gm-atom of hydrogen
1 g of oxygen and 1 gm of ozone
1 g of hydrogen and 1 gm-atom of hydrogen
4 g of calcium and 0.1 gm-atom of calcium.

15. The correctly reported difference of 18.3426 and 8.06 willhave significant figures equal to
three
four
five
six.

16. Which of the following does not have same percentage ofcarbon as in ethane?
2-Butene
Cyclohexane
Cylohexne
2-Methyl but-2ene.

17. The percentage of hydrogen in water and hydrogen peroxide is11.1 and 5.9% respectively. These figures illustrate
Law of multiple proportions
Law of conservation of mass
Law of reciprocal proportions
Law of combining volumes.

18. The number of moles of lead nitrate which are required to be decomposed to produce 48 of Oxygen
3 mol
1.5 mol
0.15 mol
0.3 mol.

19. 30 mL of an acid is neutralized by 15 mL of 0.2 N alkali. The strength of the acid is
0.1 N
0.2 N
0.3 N
0.4.

20. The compounds with identical crystal structures and analogouschemical formulae are calledallotropes.
allotropes
isotones
isotones
isomorphs

21. 12 g of Mg (at. Mass 24) react with dilute mineral acid to produce maximum hydrogen equal to
0.5 mol
1.5 mol
1.5 g
1 g-atom.

22. The conversion of oxygen to ozone occurs to the extent of 15% only. The mass of ozone that can be prepared from 67.2 L of oxygen at N.T.P. will be
14.4 g
96 g
640 g
64 g.

23. Which of the following illustrates the law of conservation of mass?
Mixing of 10 g of sulphur and 2 g of sand does not show a change in mass
The mass of platinum wire before and after heating remains constant
2.2 g of propane and 8 g of oxygen produces 10.2 g of gaseous mixture
2.8 g of CO and 1.6 g of oxygen gave only 2.24 L of CO2 at S.T.P.

24. 142 g of chlorine represents
Two g-molecules of chlorine
4 moles of chlorine atoms
Two moles of Cl atoms
Both a b.

25. The mass of 60% HCl required for the neutralization of 10 L of 0.1 M KOH is
60.8 g
21.9 g
100 g
219 g.

26. The mass of 60% HCl required for the neutralization of 10 L of 0.1 M KOH is
60.8 g
21.9 g
100 g
219 g.

27. On dividing 0.86 by 16.564 the actual answer is 0.0519198. The correctly reported answer will be
0.05
0.051
0.0519
0.05191.

28. Which one of the following solution of sulphuric acid will exactly neutralize 25 ml of 0.2 M NaOH solution?
12.5 ml of 0.1 M solution
25 ml of 0.2 M solution
25 ml of 0.1 M solution
50 ml of 0.2 M solution.

29. A certain gaseous mixture contains methane and sulphur dioxide in ratio of 1: 8 by mass. The ration of the number of molecules is
1:08
1:02
1:01
2:01

30. The volume of oxygen required for complete combustion of 20 ml of ethane is
30 ml
60 ml
40 ml
50 ml.

31. Sodium carbonate crystals lose water molecules on exposure to atmosphere. The related property is called.
Deliquescence
Fluorescence
Efflorescence
Luminescence

32. The number of moles of oxygen in one litre of air (21% oxygen by volume) at S.T.P. would be
0.186 mol
0.21 mol
2.10 mol
0.0093 mol.

33. 4 g of hydrogen is ignited with 4 g of oxygen the amount of water Formed is
2.5 g
0.5 g
4.5 g
8 g.

34. The molality of a solution containing 5 g of sodium hydroxide in 250 g of solution
0.5 m
1.0 m
2.0 m
0.1 m.

35. The number of moles of sodium oxide present in 620 g of it are
1 mol
10 mol
18 mol
100 mol.

36. On rendering anhydrous the sample of hexahydrate calcium (II) chloride loses
39.4% of its mass
49.3% of its mass
46.5% of its mass
43.9% of its mass.

37. The molarity of the solution containing 2.8% mass-volume solution of KOH is
M/10
M/2
M/5
1 M.

38. The number of atoms is largest in
71 g of chlorine
48 g of magnesium
127 g of iodine
4 g of hydrogen.

39. Which of following acid can show optical isomerism?
2 2-Dimathylpropanoic acid
2-Methylpropanoic acid
2-Methylbutanoic acid
Ethanoic acid.

40. The mole fraction of water in a solution containing 117 g sodium chloride and 900 g of water is
0.0632
0.038
0.9615
1.000.

41. During synthesis of ammonia from its constituent elements the volume of the product relative to the total volume of thereacting species is.
one-fourth
three-fourth
one-half
one-eighth

42. 50 ml of samples of distilled water ordinary tap water and boiled tap water requires 2 ml 26 and 10 of soap solution respectively to form permanent lather. The ratio of permanent hardness to temporary hardness in tap water is
1:02
3:02
2:00
2:01

43. The number of moles of NaCl in 3 L of 3 M NaCl solution is
1
3
9
6

44. The mole fraction of solute in 1 molal aqueous solution is
0.0177
1.8
0.05
0.98

45. 27 g of Al will completely react with.
3 mol of oxygen
3 g-atoms of oxygen
3 g-equivalents of oxygen
3 atoms of oxygen

46. The density of chlorine relative to air is.
3
2.46
4

47. When 4.0 g of iron is burnt at high temperature to ferric oxide at constant pressure 29.28 kJ Of heat is evolved. The amount of heat evolved for producing one mole of ferric oxide is
819.84 kJ
40.99 kJ
81.98 kJ
409.9 kJ.

48. 33.6 L of water vapour at S.T.P. are condensed to liquid state. The volume occupied by it is approximately.
1 L
18 ml
27 L
127 ml