1. At S.T.P. the density of CCl4 vapours in g/Lwill be nearest to:
(a) 6.87
(b) 3.42
(c) 10.26
(d) 4.57
2. One litre hard water contains 12.00 mg Mg2+.Mili-equivalents of washing soda required to remove its hardness is:
(a) 1
(b) 12. 16
(c) 1 × 10-3
(d) 12. 16 × 10-3
4. A metal oxide has the formula Z2O3. It can be reduced by hydrogen to give free metal and water. 0.1596 g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is
(a) 27.9
(b) 159.6
(c) 79.8
(d) 55.8
5. Ratio of Cpand CV of a gas ‘X’ is 1.4. The number of atoms of the gas ‘X’ present in 11.2 litres of it at NTPwill be
(a) 6.02 ×1023
(b) 1.2 × 1023
(c) 3.01 × 1023
(d) 2.01 × 1023
6. 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
7. The number of gram molecules of oxygen in 6.02 × 1024CO molecules is
(a) 10 gm molecules
(b) 5 gm molecules
(c) 1 gm molecules
(d) 0.5 gm molelcules
8. The number of oxygen atoms in 4.4 g of CO2 is
(a) 1.2 × 1023
(b) 6 × 1022
(c) 6 × 1023
(d) 12 × 1023
9. Boron has two stable isotopes, 10B (19%) and11B (81%). Average atomic weight for boron in the periodic table is
(a) 10.8
(b) 10.2
(c) 11.2
(d) 10.0
10. The molecular weight of O2 and SO2 are 32 and 64 respectively. At 15°Cand 150 mm Hg pressure, one litre of O2 contains ‘N’ molecules. The number of molecules in two litres of SO2 under the same conditions of temperature and pressure will be:
(a) N/2
(b) N
(c) 2N
(d) 4N
11. A5 molar solution of H2 SO4 is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be:
(a) 1N
(b) 0.1N
(c) 5N
(d) 0.5N
12. If NA is Avogadro’s number then number of valence electrons in 4.2g of nitride ions (N3–) is
(a) 2.4 NA
(b) 4.2 NA
(c) 1.6 NA
(d) 3.2 NA
13. In the final answer of the expression
the number of significant figure is :
(a) 1
(b) 2
(c) 3
(d) 4
14. The weight of one molecule of a compound
C60H122 is
(a) 1.2 ´ 10-20 gram
(b) 1.4 ´ 10-21 gram
(c) 5.025 ´ 1023gram
(d) 6.023 ´ 1023gram
15. The percentage weight of Zn in white vitriol [ZnSO47. H2O] is approximately equal to (Zn = 65, S=32,O=16 and H= ?)
(a) %33.65
(b) %32.56
(c) %23.65
(d) %22.65
16. Liquid benzene (C6H6) burns in oxygen according to the equation 2C6H6(l) +15O2 ® 12 CO2(g) +6H2O(g) How many litres of O2 at STP are needed to complete the combustion of 39g of liquid benzene ? (Mol. Wt. O2 = 32 , C6H6 = 78)
(a) 74 L
(b) 11.2 L
(c) 22.4 L
(d) 84 L
17.
18. The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are
(a) 3,4 and 5 respectively
(b) 3,4 and 4 respectively
(c) 3,3 and 4 respectively
(d) 3,3 and 3 respectively
19. Haemoglobin contains %0.334 of iron by weight. The molecular weight of haemoglobin is approximately .67200The number of iron
atoms (at. wt. of Fe is )56 present in one molecule of haemoglobin are
21. An organic compound containing C, Hand Ogave on analysis C– %40 and H – .%6.66Its empirical formula would be(a) C3H6O
22.
23.
24.
25. (B)
50(b)
