Class XI Chemistry Thermodynamics 8

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Question 1

Find molar heat capacity of triatomic linear gas if the process is .

• AR
• B2R
• C3R
• D2.5R

Question 2

3 moles of an ideal gas being initially at a temperature 273K was isothermally expanded 5 times its initial volume and then isochorically heated so that the pressure in the final state become equal to that in the initial state. The total amount of heat transferred to the gas during the process equals 80kJ. the value of Cv for the gas in cal/K-mol…

• A2
• B3
• C4
• D5

Question 3

The enthalpy change on freezing of 1 mol of water at 5 °C to ice at −5 °C is:
(Given

• A
• B
• C
• D

Question 4

The standard enthalpy changes for the combustion of carbon and carbon monoxide are shown below.

C(s) + O₂(g)→ CO₂(g)                          ΔH = -394 kJ mol^-1

CO(g) + 1/2 O₂(g)→ CO₂ (g)              ΔH = -283 kJ mol^-1
What is the standard enthalpy change, in kJ, for the following reaction?

C(s) + 1/2O₂(g)→ CO (g)

• A111kJ
• B-111 kJ
• C-677 kJ
• D677 kJ

Question 5

Which of the following statements is true?
The entropy of the universe–

• AIncreases and tends towards maximum value
• BDecreases and tends to zero
• CRemains constant
• DDecreases and increases with a periodic rate

Question 6

For a real gas, internal energy is a function of -

• ATemperature
• BVolume
• CBoth a and b
• DNone

Question 7

The enthalpy of reaction 4X(g) → X₄(g) is – 100 kJ/mol at 300 K. The enthalpy of vaporisation for X and X₄ are 30 kJ/mol and 72 kJ/mol respectively. 
∆S for tetramerization of X in liquid phase is –125 J/K mol at 300 K.
calculate ∆G at 300 K for 4X(l) →X₄(l).

• A– 52 kJ/mol
• B– 89.5 kJ/mol
• C–14.5 kJ/mol
• D–39.7 kJ/mol

Question 8

Determine ∆G^o in kcal/mol at 300K for the process

• A-4.974
• B-49.74
• C49.74
• D497.4

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