Thermodynamics Test

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Thermodynamics Test - 23

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Weekly Quiz Competition

Question 1
4 / -1

One mole of ice is converted into water at 273 K. The entropies of H₂O(s) and H₂O(l) are 38.20 and 60.01 J mol^-1 K^-1 respectively. The enthalpy change for the conversion is

A
3 kJ mol^-1

B
4 kJ mol^-1

C
5 kJ mol^-1

D
6 kJ mol^-1
Question 2
4 / -1

Which of the following processes is associated with decrease in entropy ?

A
Vaporisation of a mole of water into steam at its b.p.

B
Dissociation of a mole of common salt in water at 300 K

C
Mixing of two partially miscible liquids

D
Crystallisation of a salt from its saturated solution
Question 3
4 / -1

Which of the following statements is true ?

A
The total entropy of the universe is continuously decreasing

B
The total energy of the universe is continuously decreasing

C
The total energy of the universe remains constant

D
The total entropy of the universe remains constant
Question 4
4 / -1

Identify the correct statement from the following in a chemical reaction.

A
The entropy always increases

B
The change in entropy along with suitable change in enthalpy decides the rate of reaction

C
The enthalpy always decreases

D
Both the enthalpy and the entropy remain constant
Question 5
4 / -1

For an isolated system, ∆U = 0, then

A
∆S = 0

B
∆S < 0

C
∆S > 0

D
The values of ∆S cannot be predicted
Question 6
4 / -1

The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm³ to a volume of 100 dm³ at 27°C is

A
38.3 J mol^-1 K^-1

B
35.8 J mol^-1 K^-1

C
32.3 J mol^-1 K^-1

D
42.3 J mol^-1 K^-1
Question 7
4 / -1

The enthalpy of vaporisation of benzene is +35.3 kJ/mol at its boiling point of 80°C. The entropy change in the transition of vapour to liquid at its boiling point is .... [in J mol^-1 K^-1].

A
- 100

B
+ 100

C
+ 342

D
- 342
Question 8
4 / -1

For a particular reversible reaction at temperature T, ∆H and ∆S were found to be both +ve. If T_e is the temperature at equilibrium, the reaction would be spontaneous when

A
T_e > T

B
T >T_e

C
T_e is 5 times T

D
T = T_e
Question 9
4 / -1

When ice melts into water, the entropy

A
becomes zero

B
remains same

C
decreases

D
increases
Question 10
4 / -1

If ∆G is negative, the reaction will be

A
at equilibrium

B
not possible

C
Both (1) and (2)

D
possible

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Thermodynamics Test - 23

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Thermodynamics Test - 23

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Question 1

3 kJ mol-1

4 kJ mol-1

5 kJ mol-1

6 kJ mol-1

Question 2

Vaporisation of a mole of water into steam at its b.p.

Dissociation of a mole of common salt in water at 300 K

Mixing of two partially miscible liquids

Crystallisation of a salt from its saturated solution

Question 3

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

Question 4

The entropy always increases

The change in entropy along with suitable change in enthalpy decides the rate of reaction

The enthalpy always decreases

Both the enthalpy and the entropy remain constant

Question 5

∆S = 0

∆S < 0

∆S > 0

The values of ∆S cannot be predicted

Question 6

38.3 J mol-1 K-1

35.8 J mol-1 K-1

32.3 J mol-1 K-1

42.3 J mol-1 K-1

Question 7

- 100

+ 100

+ 342

- 342

Question 8

Te > T

T >Te

Te is 5 times T

T = Te

Question 9

becomes zero

remains same

decreases

increases

Question 10

at equilibrium

not possible

Both (1) and (2)

possible

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3 kJ mol^-1

4 kJ mol^-1

5 kJ mol^-1

6 kJ mol^-1

38.3 J mol^-1 K^-1

35.8 J mol^-1 K^-1

32.3 J mol^-1 K^-1

42.3 J mol^-1 K^-1

T_e > T

T >T_e

T_e is 5 times T

T = T_e