Important Questions of Thermodynamics Chemistry | Zigya

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211.

The value of entropy of solar system is

  • Increasing

  • decreasing

  • constant

  • zero


212.

Which of the following statements is true?

  • The total entropy of the universe is continuously decreasing

  • The total energy of the universe is continuously decreasing

  • The total energy of the universe remains constant

  • The total entropy of the universe remains constant


213.

A gas expands from a volume of 1m3 to a volume of 2m3 against an external pressure of 105Nm-2. The work done by the gas will be

  • 102 kJ

  • 102 J

  • 103 J

  • 105 kJ


214.

Given thermochemical equation, 2H2 (g) + O2(g) → 2H2O,ΔH = -571.6 kJ. Heat of decomposition of water is

  • -571.6 kJ

  • +571.6 kJ

  • -1143.2 kJ

  • + 285.8 kJ


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215.

The ratio of heats liberated at 298 K from the combustion of one kg of coke and by burning water gas obtained from kg of coke is (Assume coke to be 100% carbon). (Given : enthalpies of combustion of CO2, CO and H2 as 393.5 kJ, 285 kJ, 285 kJ respectively all at 298 K)

  • 0.79 : 1

  • 0.69 : 1

  • 0.86 : 1

  • 0.96 : 1


216.

The process is spontaneous at the given temperature, if

  • ΔH is +ve and ΔS is -ve

  • ΔH is -ve and ΔS is +ve

  • ΔH is +ve and ΔS is +ve

  • ΔH is +ve and ΔS is equal to zero.


217.

For an ideal binary liquid mixture.

  • Smix = 0; Gmix = 0

  • Hmix = 0; Smix < 0

  • Vmix = 0; Gmix > 0

  • Smix > 0; Gmix < 0


218.

The correct statement regarding entropy is

  • at absolute zero temperature, entropy of a perfectly crystalline solid is zero

  • at absolute zero temperature, the entropy of a perfectly crystalline substance is positive

  • at absolute zero temperature, the entropy of all crystalline substances is zero

  • at 0°C, the entropy of a perfect crystalline solid is zero


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219.

In the reaction, S + 32O2 SO3+ 2xkJ and SO2+ 12O2SO3+ ykJ. Heat of formation of SO2 is

  • x + y

  • x - y

  • 2x-y

  • 2x + y


220.

A reaction has both ΔH and ΔS-ve. The rate of reaction

  • increases with increases in temperature

  • cannot be predicted for change in temperature

  • increases with decreases in temperature

  • remains unaffected by change in temperature


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