For the reaction,A (g) + 2B (g) → 2C (g) + 3D (g)the change

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 Multiple Choice QuestionsMultiple Choice Questions

401.

Ionisation depends upon :

  • pressure

  • volume

  • dilution

  • none of these


402.

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is:(Given that 1 L bar = 100 J)

  • 5 kJ

  • 25 J

  • 30 J

  • -30 J


403.

In which case change in entropy is negative?

  • Expansion of a gas at constant temperature

  • Sublimation of solid to gas

  • 2H(g) → H2(g)

  • Evaporation of water


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404.

For the reaction,

A (g) + 2B (g) → 2C (g) + 3D (g)

the change of enthalpy at 27°C is 19 kcal. The value of E is

  • 21.2 kcal

  • 17.8 kcal

  • 18.4 kcal

  • 20.6 kcal


B.

17.8 kcal

The reaction is,

A (g) + 2B (g) → 2C (g) + 3D (g)

Hence, ng = np - nr = 5 - 3 = 2H = 19 × 103 kcal The value of internal energyE =H - ngRT

                 = 19 × 10-3 - (2 × 2 × 300)

                 = 17.8 kcal


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