Thermodynamics Test

Result

Thermodynamics Test - 34

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Weekly Quiz Competition

Question 1
4 / -1

A
- 26.7 kcal

B
+ 26.7 kcal

C
- 52.4 kcal

D
+ 52.4 kcal
Question 2
4 / -1

A
- 814.4 kJ

B
+ 320.5 kJ

C
- 650.3 kJ

D
-933.7 kJ
Question 3
4 / -1

A
- 227.2 kJ

B
- 272.3 kJ

C
227.2 kJ

D
272.3 kJ
Question 4
4 / -1

The enthalpies of formation of Al₂ O₃ and Cr₂ O₃ are - 1596 kJ and - 1134 kJ respectively. ∆H for the reaction,
2Al + Cr₂ O₃ →2Cr + Al₂O₃ is

A
- 2730 kJ

B
- 462 kJ

C
- 1365 kJ

D
+ 2730 kJ
Question 5
4 / -1

A
484

B
- 484

C
271

D
- 271
Question 6
4 / -1

A substance is carried out through the following transformations.
The equations ∆S₁ + ∆S₂ = ∆S₃ + ∆S₄ + ∆S₅

A
is true only if the steps are carried out reversibly

B
is always true because entropy is a state function

C
may be true but need more informations on the processes

D
is incorrect
Question 7
4 / -1

At 298 K the entropy of rhombic sulphur is 32.04 J/mol K and that of monoclinic sulphur is 32.68 J/mol K. The heat of their combustion are respectively - 298246 and - 297948 J mol^-1. ∆G for the reactions; S_rhombic → S_monoclinic will be

A
107.28 J

B
10.728 J

C
107.28 kJ

D
10728 J
Question 8
4 / -1

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

A
704 JK^-1 mol^-1

B
80 JK^-1 mol^-1

C
24.64 KJ^-1 mol^-1

D
7.04 JK^-1 mol^-1
Question 9
4 / -1

For a spontaneous process, the correct statement (s) is (are)

A
( ∆G_system )_{T , p} > 0

B
( ∆S_system ) + ( ∆S_surroundings ) > 0

C
( ∆G_system )_{T , p} > 0

D
( ∆U_system )_{T , V} > 0
Question 10
4 / -1

For an ideal gas, consider only p-V work in going from an initial state X to the final state Z. The final state Z can be reached by either of the two paths shown in the figure.
Which of the following choice (s) is (are) correct ?

A
∆S_X→Z = ∆S_X→Y + ∆S_Y→Z

B
W_X→Z = W_X→Y + W_Y→Z

C
W_X→Y→Z = W_X→Y

D
∆S_X→Y→Z = ∆S_X→Y

Solution