Chemical Engineering Thermodynamics - Study Mode

[#261] Equilibrium constant of a reaction varies with the
Correct Answer

(C) Temperature

Explanation

Solution: The equilibrium constant $$left( {{K_C}}
ight)$$ xa0 is dependent only on temperature and nature of reactants and products involved and the relation is given as : $${K_C} = A{e^{ - frac{{{E_A}}}{{RT}}}}$$

[#262] Which of the following will increase the volume of a real gas by four times ?
Correct Answer

(B) Reducing pressure to one fourth at constant temperature

Explanation

Solution: According to the gas law we can write $$frac{{{P_1}{V_1}}}{{{T_1}}} = frac{{{P_2}{V_2}}}{{{T_2}}}$$ So by reducing the pressure to $$frac{P}{4}$$ at constant temperature the volume increases to $$4$$ times the initial volume.

[#263] The accentric factor of a materical, 'ω', is defined as ω = -log 10 (P r sat )T r -1 = 0.7, where, P r sat = reduced vapor pressure, T r = reduced temperature. The value of accentric factor is always
Correct Answer

(B) < 1

[#264] The number of degrees of freedom for a mixture of ice and water (liquid) are
Correct Answer

(C) 1

Explanation

Solution: Given, number of components $$= 1$$ Number of phases $$= 2$$ So, degree of freedom $$f = 1 - 2 + 2 = 1$$

[#265] A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is
Correct Answer

(A) The distribution law

Explanation

Solution: The distribution laws says that for two non-miscible solvents will be in equilibrium if the chemical potential of solute is same in both the phases the concentration need not be equal but the ratio of concentrations will be remains constant once equilibrium is reached.