A certain reaction is at equilibrium at 82°C and the enthalpy

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 Multiple Choice QuestionsMultiple Choice Questions

311.

In an isothermal process

  • H = E+PV

  • H = W

  • H = E

  • H =ST


312.

In an isochoric process, the increase in internal energy is equal to:

  • the sum of heat absorbed and work done

  • the work done

  • heat absorbed

  • heat evolved


313.

Heat of a reaction at constant pressure is equal to:

  • HP - HR

  • HP + HR

  • HP × HR

  • HPHR


314.

10 moles of ideal gas expand isothermally and reversibly from a pressure of 10 atrn to 1 atm at 300K. What is the largest mass which can lifted through a height of 100 meter?

  • 48.75 kg

  • 58.55 kg

  • 75.64 kg

  • 64.13 kg


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315.

The cooling in refrigerator is due to :

  • the reaction of the refrigerator gas

  • the expansion of ice

  • the expansion of the gas in the refrigerator

  • the work of the compressor


316.

The temperature of the system decreases in an :

  • adiabatic compression

  • isothermal compression

  • isothermal expansion

  • adiabatic expansion


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317.

A certain reaction is at equilibrium at 82°C and the enthalpy change for this reaction is 21.3 kJ. The value of S(JK-1mol-1) for the reaction is :

  • 55.0

  • 60.0

  • 68.5

  • 120.0


B.

60.0

Gibb's free energy ,

G = H - TS

 H = TS

or  S = HT = 21.3 × 103355 = 60 JK-1 mol-1


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318.

The heat is liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25 °C and it increases the temperature of 18.94 kg of water by 0.632 °C. If the specific heat of water at 25 °C is 0.998 cal/g-deg, then value of the heat of combustion of benzoic acid is

  • 881.1 kcal

  • 981.1 kcal

  • 771.1 kcal

  • 871.2 kcal


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319.

Assertion : Spontaneous process is an irreversible process and may be reversed by some external agency.

Reason : Decrease in enthalpy is a contributory factor for spontaneity.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false

  • If both assertion and reason are false.


320.

ΔHf° (C2H4) , ΔHf° (C2H6) are x1 and x2 kcalmol-1 respectively. Then heat of hydrogenation of C2H4 is :

  • x1 + x2

  • x1 - x2

  • -(x1 - x2)

  • x1 + 2x2


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