Thermodynamics Test

Result

Thermodynamics Test - 31

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Weekly Quiz Competition

Question 1
4 / -1

Given the reaction at 1240 K and 1 atm.
CaCO₃(s) → CaO(s) + CO₂(g), ΔH = 176 kJ/mol, the ΔE equals

A
160.0 kJ

B
165.6 kJ

C
186.4 kJ

D
180.0 kJ

Solution
Question 2
4 / -1

The latent heat of vaporisation of a liquid at 500 K and 1 atm. pressure is 10.0 kcal /mol. What will be the change in internal energy of 3 moles of the liquid at the same temperature and pressure ?

A
27.0 kcal

B
13.0 kcal

C
‒ 27.0 kcal

D
‒ 13.0 kcal

Solution
Question 3
4 / -1

2 mole of an ideal gas at 27^oC temperatures is expanded reversibly from 2 lit. to 20 lit. Find entropy change (R = 2 cal/ mol K)

A
92.1

B
0

C
4

D
9.2

Solution
Question 4
4 / -1

What percent T₁ is of T₂ for a heat engine whose efficiency is 10% ?

A
80%

B
90%

C
10%

D
100%

Solution
Question 5
4 / -1

One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0L, 95 K) → (4.0 atm, 5.0 L, 245 K) with a change in internal energy, ∆U = 30.0L atm. The change in enthalpy (∆H) of the process in L atm is

A
40.0

B
42.3

C
44.0

D
not defined, because pressure is not constant

Solution
Question 6
4 / -1

The table given below lists the bond dissociation energy (E_diss) for single covalent bonds formed between C and atoms A, B, D and E.

A
D

B
E

C
A

D
B
Question 7
4 / -1

Heat of neutralisation of NaOH and HCl is – 57.3 kJ mol^-1. The heat of ionization of water will be

A
‒ 57.3 kJ mol^-1

B
‒ 114.6 kJ mol^-1

C
+57.3 kJ mol^-1

D
+114.6 kJ mol^-1

Solution
Question 8
4 / -1

A
q = 0

B
T₂ = T₁

C
p₂ V₂ = p₁ V₁

D
All the above
Question 9
4 / -1

A
T₁ = T₂

B
T₃ > T₁

C
W_adiabatic > W_isothermal

D
∆U_adiabatic > ∆U_isothermal
Question 10
4 / -1

An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If T_i is the initial temperature and T_f is the final temperature, which of the following statements is correct ?

A
( T_f )_irrev > ( T_f )_rev

B
T_f > T_i for reversible process but T_f = T_i for irreversible process

C
( T_f )_rev = ( T_f )_irrev

D
T_f > T_i for both reversible and irreversible process