Important Questions of Thermodynamics Chemistry | Zigya

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

Advertisement
61.

The yield of the product in the reaction

A2(g) + 2B(g) C(g) + Q kJ would be higher at

  • high temperature and high pressure

  • high temperature and low pressure

  • low temperature and high pressure

  • low temperature and low pressure


62.

Given that Hf(H) = 218 kJ / mol, express the H-H bond energy in kcal/mol.

  • 52.15

  • 911

  • 104

  • 52153


63.

Calculate H° for the reaction, Na2O(s) + SO3(g)  Na2SO4(g) given the following:(A) Na(s) +H2O(l)  NaOH(s) + 12H2(g) ;H°= -146 kJ(B) Na2SO4(s) +H2O(l) 2 NaOH(s) + SO3(g); H°=+ 418 kJ(C) 2 Na2O(s) +2 H2(g) 4Na(s) + 2H2O(l); H°= +259 kJ

  • +823 kJ

  • -581 kJ

  • -435 kJ

  • +531 kJ


64.

If an endothermic reaction occurs spontaneously at constant temperature (T) and pressure (p), then which of the following is true?

  • G > 0

  • H < 0

  • S > 0

  • S < 0


Advertisement
65.

A spontaneous process is one in which the system suffer

  • no energy change

  • a lowering of free energy

  • a lowering of entropy

  • an increase in internal energy


66.

When a solid melts reversibly :

  • H decreases

  • G increases

  • E decreases

  • S increases


67.

Enthalpy is equal to :

  • T2(G/T)TP

  • -T2(G/T)TP

  • T2(G/T)TV

  • -T2(G/T)TV


68.

Condition for spontaneity in an isothermal process is

  • A + W < 0

  • G + U <0

  • A + U>0

  • G -U<0


Advertisement
69.

2C(s) + 2O2(g)  2CO2(g);              H= -787 kJ ....(i)H2(g) + 12O2(g)  H2O (l);              H = -286 kJ ...(ii)C2H2(g) + 212O2(g)  2CO2(g) + H2O (l) ;  H= -1310 kJ ...(iii)

The heat of formation of acetylene is :

  • -1802 kJ

  • +1802 kJ

  • +237 kJ

  • -800 kJ


70.

The standard molar heat of formation of ethane, CO2 and water (l) are -21.1, -94.1 and -68.3 kcal respectively. The standard molar heat of combustion of ethane will be

  • -372 kcal

  • 162 kcal

  • -240 kcal

  • 183.5 kcal


Advertisement