Thermodynamics Test

Result

Thermodynamics Test - 27

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Weekly Quiz Competition

Question 1
4 / -1

The free energy for a reaction having ∆H = 31400 cal, ∆S = 32 cal K^-1 mol^-1 at 1000° C is

A
- 9336 cal

B
- 7386 cal

C
- 1936 cal

D
+ 9336 cal
Question 2
4 / -1

∆G° vs T plot in the Ellingham's diagram slopes upwards for the reactions

A

B

C

D
Question 3
4 / -1

Considering entropy (S) as a thermodynamic parameter the criterion for the spontaneity of any process is

A
∆S_system + ∆S_surroundings > 0

B
∆S_system - ∆S_surroundings > 0

C
∆S_system > 0 only

D
∆S_surroundings > 0 only
Question 4
4 / -1

The correct relationship between free energy change in a reaction and the corresponding equilibrium constant K_c , is

A
∆G = RT ln K_c

B
- ∆G = RT ln K_c

C
∆G° = RT ln K_c

D
- ∆G° = RT ln K_c
Question 5
4 / -1

In the reaction C(s) + O₂ (g) → CO₂ (g) + 93.4 kcal

A
Enthalpy of products is greater than that of reactants

B
Enthalpy of products is less than that of reactants

C
Enthalpy of products is same as that of reactants

D
Enthalpy of products is half of that of reactants.
Question 6
4 / -1

∆E is the heat absorbed at constant

A
temperature (T)

B
pressure (P)

C
volume (V)

D
T, P and V
Question 7
4 / -1

Look at the following diagram:
The enthalpy change for the reaction A → B will be

A
-25 kJ

B
-40 kJ

C
+25 kJ

D
– 65 kJ
Question 8
4 / -1

The heat formation of H₂O (l) is — 68.0 kcal, the heat of formation of H₂O (g) is likely to be

A
– 68.0 kcal

B
– 69.4 kcal

C
80.0 kcal

D
– 58.3 kcal

Solution
Question 9
4 / -1

The heats of neutralisation of four acids a, b, c and d when neutralised against a common base are 13.7, 9.4, 11.2 and 12.4 kcal respectively. The weakest among these acids is

A
a

B
b

C
c

D
d
Question 10
4 / -1

In a reversible process, ∆S_sys + ∆S_surr is

A
> 0

B
< 0

C
≥ 0

D
= 0