Important Paper Chemistry
1: the unit of equivalent conductivity is
A: S-cm -2
B: ohm – cm2 (g-equivalent)
C: ohm – cm
D: ohm-1 cm2 (g-equivalent)-1
Correct Answer: D
2: The volume occupied by 7 g of nitrogen at 27°C and 750 mm Hg pressure is
A: 8.24 litres
B: 6.14 litres
C: 6.24 litres
D: 5.24 litres
Correct Answer: C
3: Enthalpy of an exothermic reaction is always
A: positive
B: zero
C: negative
D: may be (a) or (b)
Correct Answer: C
4: The vapour density of ozone is
A: 16
B: 32
C: 24
D: 48
Correct Answer: C
5: Number of moles of a solute per kilogram of a solvent is called
A: molarity
B: normality
C: molality
D: formality
Correct Answer: C
6: Oxidation number of chromium in Na2Cr2O7 is
A: +2
B: +6
C: +3
D: +6
Correct Answer: D
7: The freezing point of a solution, prepared from 1.25 g of a nonelectrolyte in 20 g of water is 271.9 K. if molar depression constant is 1.86K/mol, then molar mass of the solute will be
A: 105.7
B: 115.3
C: 106.7
D: 119.9
Correct Answer: A
8: The tenth element is the periodic table resembles the element with atomic number
A: 2 and 30
B: 8 and 18
C: 2 and 54
D: 8 and 54
Correct Answer: C
9: The rise in the boiling point of a solution containing 1.8 g of glucose in 100 g of a solvent is 0.1°C. The molal elevation constant of the liquid is
A: 0.01 K/m
B: 1 K/m
C: 0.1 K/m
D: 10 K/m
Correct Answer: B
10: The volume of 2.8 g of carbon monoxide at 27°C and 0.821 atm pressure is
A: 0.3 litre
B: 3 litre
C: 1.5 litre
D: 30 litre
Correct Answer: B
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