A. Only enthalpy change (ΔH) is negative
B. Only internal energy change (ΔE) is negative
C. Both ΔH and ΔE are negative
D. Enthalpy change is zero
Related Mcqs:
- Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O ⇌ CO2 + H2, by_________________?
A. Low temperature and high pressure
B. Low temperature and low pressure
C. High temperature and high pressure
D. High temperature and low pressure - 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 - For the reversible exothermic reaction, N2 + 3H2 ⇌ 2NH3, increase of pressure would________________?
A. Shift the equilibrium towards right
B. Give higher yield of NH3
C. Both B. and C
D. Neither A. nor B - Consider the reaction, C + O2 ⇌ CO2; ΔH = – 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2 ?
A. -94 kcal
B. +94 kcal
C. > 94 kcal
D. < -94 kcal - If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will___________________?
A. Increase
B. Decrease
C. Remain unaltered
D. Increase or decrease; depends on the particular reaction - In the reaction, represented by, 2SO2 + O2 ⇌ 2SO3; ΔH = – 42 kcal; the forward reaction will be favoured by____________________?
A. Low temperature
B. High pressure
C. Both A. and B
D. Neither A. nor B - The absolute entropy for all crystalline substances at absolute zero temperature is ____________________?
A. Zero
B. Negative
C. More than zero
D. Indeterminate - Linde gas liquefaction process employs cooling ____________________?
A. By throttling
B. By expansion in an engine
C. At constant pressure
D. None of these - A change in state involving a decrease in entropy can be spontaneous, only if ____________________?
A. It is exothermic
B. It is isenthalpic
C. It takes place isothermally
D. It takes place at constant volume - The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)____________________?
A. V1/V2
B. V2/V1
C. V1 – V2
D. V1.V2
