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Multiple Choice Questions

151.

Cooking is fast in a pressure cooker, because

food particles are effectively smashed
water boils at higher temperature inside the pressure cooker
food is cooked at constant volume
loss of heat due to radiation is minimum

152.

1 g of silver gets distributed between 10 cm³ of molten zinc and 100 cm³ of molten lead at 800°C. The percentage of silver still left in the lead layer is approximately

153.

Asolution of two liquids boils at a temperature more than the boiling point of either of them. Hence, the binary solution shows

negative deviation from Raoult's law
positive deviation from Raoult's law
no deviation from Raoult's law
positive or negative deviation from Raoult's law depending upon the composition

154.
A solution of 1.25 of 'P' in 50 g of water lowers freezing point by 0.3°0. Molar mass of 'P' is 94. K_f(water) = 1.86 K kg mol^-1. The degree of association of 'P' in water is

80%

60%

65%

75%

80%

Step I - Calculation of van't Hoff factor of 'P'

$∆ T_{f} = i \times K_{f} \times m = i \times K_{f} \times \frac{w_{1} \times 1000}{w_{2} \times M_{1}} 0.3 = i \times 1.86 \times \frac{1.25 \times 1000}{50 \times 94} i = \frac{0.3 \times 50 \times 94}{1.86 \times 1.25 \times 1000}$