Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?
(A) Entropy
(B) Internal energy
(C) Enthalpy
(D) Gibbs free energy
At ____________ point, all the three phases (i.e. solid, liquid and gas) co-exist ?
(A) Eutectic
(B) Triple
(C) Plait
(D) Critical
For a thermodynamic system containing ‘x’ chemical species, the maximum number of phases that can co-exist at equilibrium is_________________?
(A) x
(B) x + 1
(C) x + 2
(D) x + 3
Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the__________________?
(A) Two temperatures only
(B) Pressure of working fluid
(C) Mass of the working fluid
(D) Mass and pressure both of the working fluid
The equilibrium constant for a chemical reaction at two different temperatures is given by__________________?
(A) Kp2/Kp1 = – (ΔH/R) (1/T2 – 1/T1)
(B) Kp2/Kp1 = (ΔH/R) (1/T2 – 1/T1)
(C) Kp2/Kp1 = ΔH (1/T2 – 1/T1)
(D) Kp2/Kp1 = – (1/R) (1/T2 – 1/T1)
A domestic refrigerator has a/an ____________ cooled condenser?
(A) Water
(B) Air
(C) Evaporative
(D) Gas
The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the _____________ equation?
(A) Van Laar
(B) Margules
(C) Gibbs-Duhem
(D) Gibbs-Duhem-Margules
A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is________________?
(A) Zero
(B) Positive
(C) Negative
(D) None of these
Which of the following is not a common refrigerant ?
(A) Freon-12
(B) Ethylene
(C) Ammonia
(D) Carbon dioxide
The energy of activation of exothermic reaction is_________________?
(A) Zero
(B) Negative
(C) Very large compared to that for endothermic reaction
(D) Not possible to predict