Thermodynamics Test

Result

Thermodynamics Test - 15

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Weekly Quiz Competition

Question 1
4 / -1

What are the units of entropy ?

A
cal K

B
cal K^-1

C
cm K^-1

D
cm K
Question 2
4 / -1

A
heating, cooling, heating, cooling

B
cooling, heating, cooling, heating

C
heating, cooling, cooling, heating

D
cooling, heating, heating, cooling
Question 3
4 / -1

A
K to L and L to M

B
L to M and N to K

C
L to M and M to N

D
M to N and N to K
Question 4
4 / -1

A gas expands from a volume of 1m³ to a volume of 2m³ against an external pressure of 10⁵ Nm^-2. The work done by the gas will be

A
10² kJ

B
10² J

C
10³ J

D
10⁵ kJ

Solution
Question 5
4 / -1

We believe in the laws of thermodynamics because they are

A
theoretical

B
derived based on mathematical analysis

C
empirical and nobody disproved

D
mere statements
Question 6
4 / -1

Which one of the following is an exothermic reaction ?

A
N₂ (g) + O₂ (g)+ 180.8 kJ → 2NO(g )

B
N₂ (g) + 3H₂(g) - 92 kJ → 2NH₃ (g)

C
C(g ) + H₂O(g) → CO(g) + H₂ (g) - 131.1kJ

D
C (graphite) + 2S(s) → CS₂(l) - 91.9 kJ
Question 7
4 / -1

Which of the following taking place in the blast furnace is endothermic ?

A

B

C

D
Question 8
4 / -1

Hess's law states that

A
the standard enthalpy of an overall reaction is the sum of the enthalpy changes in individual reactions

B
enthalpy of formation of a compound is same as the enthalpy of decomposition of the compound into constituent elements, but with opposite sign

C
at constant temperature the pressure of a gas is inversely proportional to its volume

D
the mass of a gas dissolved per litre of a solvent is proportional to the pressure of the gas in equilibrium with the solution.
Question 9
4 / -1

A swimmer coming out from a pool is covered with a film of water weighing about 18 g. Calculate the internal energy of vaporisation at 100°C.
[ ∆_vap H^⊖ for water at 373 K = 40.66 kJ mol ^-1 ]
The correct option is

A
35.67 kJ mol ^-1

B
37.56 kJ mol ^-1

C
36.57 kJ mol ^-1

D
38.75 kJ mol ^-1

Solution
Question 10
4 / -1

A
250 R

B
- 500 R

C
500 R

D
-250 R

Solution