Assertion: During an adiabatic process, heat energy is not exchan

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 Multiple Choice QuestionsMultiple Choice Questions

381.

Assertion : BaCO3 is more soluble in HNO3 than in plain water.

Reason : Carbonate is a weak base and reacts with the H+ from the strong acid, causing the barium salt to dissociate.

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

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


382.

Assertion : H and E are almost the same for the reaction, N2(g) + O2(g) → 2NO(g)

Reason : All reactants and products are gases.

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

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


383.

Which of the following is always feasible?

  • H=TS

  • H(+ve), TS (-ve) and H >TS

  • H(-ve), TS (+ve) and H < TS

  • H(-ve), TS (-ve) and H >TS.


384.

Given that 

C + O2  CO2 ; H° =-a kJ.2CO + O2  2CO2 ; H° = -b kJ. 

The heat of formation of CO is 

 

  • b-2a

  • 2a-b2

  • b-2a2

  • 2a-b


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385.

For the reaction, X2Y4 (l) → 2XY2 (g) at 300 K, the values of U and S are 2 kcal and 20 cal K-1 respectively. The value of G for the reaction is

  • -3400 cal

  • 3400 cal

  • -2800 cal

  • 2000 cal


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386.

Assertion: During an adiabatic process, heat energy is not exchanged between the system and its surroundings.

Reason: The temperature of a gas increases when it undergoes an adiabatic expansion.

 

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

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

  • If the assertion is true but the reason is false.

  • If both the assertion and reason are false.


C.

If the assertion is true but the reason is false.

In the adiabatic process, no heat enters or leaves the system. The system is completely insulated from its surroundings. From the first law of thermodynamics, change in internal energy,

E = q-W = 0-W = -W

Since the work is done at the expense of internal energy, therefore internal energy of the system decreases and hence temperature of the gas falls.


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387.

Assertion: Mass and volume are extensive properties.
Reason: Mass/volume is also an extensive parameter.

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

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

  • If the assertion is true but the reason is false.

  • If both the assertion and reason are false.


388.

The values of H and S of a certain reaction are -400 kJ mol-1 and -20 kJ mol-1K-1 respectively. The temperature below which the reaction is spontaneous, is

  • 100 K

  • 20°C

  • 20 K

  • 120°C


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389.

The enthalpy of vaporisation of a certain liquid at its boiling point of 35°C is 24.64 kJ mol-1. The value of change in entropy for the process is

  • 704 JK-1mol-1

  • 80 JK-1mol-1

  • 24.64 JK-1mol-1

  • 7.04 JK-1mol-1


390.

Given that,

    C + O2 → CO2H = -x kJ

2CO + O2 → 2CO2 ;H = -y kJ

The heat of formation of carbon monoxide will be

  • y - 2x2

  • y + 2x

  • 2x - y

  • 2x - y2


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