Thermodynamics Test

Result

Thermodynamics Test - 1

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Question 1
1 / -0

Statement-1: The reaction between sodium (Na) and oxygen (O₂) to form sodium oxide (Na₂O) and sodium peroxide (Na₂O₉) is spontaneous.

Statement-2: The formation of sodium oxide and sodium peroxide proceeds vigorously.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Both assertion and reason are correct but reason is not the correct explanation of assertion. A spontaneous reaction may be a fast reaction or it may be a slow reaction.
Question 2
1 / -0

At 300K, the reactions which have the following values of thermodynamic parameters occur spontaneously:

A
ΔH° = 200kJ mol^–1, ΔS°= –4 JK^–1mol^–1

B
ΔG° = –400kJ mol^–1

C
ΔH°= –200kJ mol^–1, ΔS°= –40 JK^–1mol^–1

D
ΔH°= –200kJ mol^–1, ΔS°= 4 JK^–1mol^–1

Solution

ΔG° = ΔH° – TΔS°
The reactions with negative value of ΔG° will occur spontaneously.
Question 3
1 / -0

Statement-1: T, P and V are state variables or state functions.

Statement-2: Their values depend on the state of the system and how it is reached.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Values of state functions depend only on the state of the system and not on how it is reached.
Question 4
1 / -0

During adiabatic expansion of 1 mole of a gas, the change in internal energy is –100 J. Find the work done in the process.

A
–100 J

B
50 J

C
-50 J

D
100 J

Solution

In adiabatic process, q = 0,

ΔU = q + w = w = -100 J