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Test: Third law, Heat transfer - JEE MCQ


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10 Questions MCQ Test Chemistry for JEE Main & Advanced - Test: Third law, Heat transfer

Test: Third law, Heat transfer for JEE 2024 is part of Chemistry for JEE Main & Advanced preparation. The Test: Third law, Heat transfer questions and answers have been prepared according to the JEE exam syllabus.The Test: Third law, Heat transfer MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Third law, Heat transfer below.
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Test: Third law, Heat transfer - Question 1

Fixed mass of an ideal gas contained in a 24.63 L sealed rigid vessel at 1 atm is heated from −73C to 27C. Calculate change in gibb's energy if entropy of gas is a function of temperature as S = 2 + 10−2 T(J/K):(Use 1 atm L = 0.1 kJ)

Detailed Solution for Test: Third law, Heat transfer - Question 1

At constant volume,

and
for single phase



Test: Third law, Heat transfer - Question 2

For the reaction taking place at certain temperature if equilibrium pressure is bar then would be

Detailed Solution for Test: Third law, Heat transfer - Question 2



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Test: Third law, Heat transfer - Question 3

Standard Gibb's free energy change for isomerization reaction cis-2-pentene ⇌ trans − 2 -pentene is −3.67 kJ/mol at 400 K. If more trans-2pentene is added to the reaction vessel, then

Detailed Solution for Test: Third law, Heat transfer - Question 3

If more trans-2-pentene is added, then 1 ts concentration in right hand side will increase. But in order to maintain the K constant, concentration of cis-2-pentene will also increase. Therefore more cis-2pentene will be formed.

Test: Third law, Heat transfer - Question 4
The dissolution of in water is endothermic yet it dissolves in water spontaneously. Which one of the following best explains this behaviour?
Detailed Solution for Test: Third law, Heat transfer - Question 4
The entropy driving force causes the dissolution.
Test: Third law, Heat transfer - Question 5

What is the free energy change for the conversion of 1 mole of water into steam at . The heat of vaporization of water of is . The entropy change is .

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Test: Third law, Heat transfer - Question 6

The favourable conditions for a spontaneous reaction are

Detailed Solution for Test: Third law, Heat transfer - Question 6

ΔG = ΔH − TΔS, ΔH is + ve,
ΔS is +ve;TΔS > ΔH
for spontaneous process. It will make ΔG,−ve

Test: Third law, Heat transfer - Question 7

Find the value of the equilibrium constant (K) of a reaction at 300 K, when standard Gibbs free energy change is −25 kJ mol−1 ? (Consider R = 8.33Jmol−1 K−1)

Detailed Solution for Test: Third law, Heat transfer - Question 7

Given,
Gibbs free energy
Temperature
Equilibrium constant ?




Test: Third law, Heat transfer - Question 8

In a thermodynamic process, fixed mass of a gas is changed in such a manner that the gas release of heat and of work was done on the gas. If the initial internal energy of the gas was , the final internal energy will be

Detailed Solution for Test: Third law, Heat transfer - Question 8

According to first law of thermodynamics,
heat absorbed by gas work done by gas.



Test: Third law, Heat transfer - Question 9
If for a given substance melting point is and freezing point is , then correct variation shown by, graph between entropy change and temperature is
Detailed Solution for Test: Third law, Heat transfer - Question 9
For a pure substance and represent the same temperature. Hence is a correct choice.
Test: Third law, Heat transfer - Question 10

When of ice at melts to water at , the resulting change in its entropy, taking latent heat of ice to be , is

Detailed Solution for Test: Third law, Heat transfer - Question 10

Change in entropy is given by or

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