Work done in the reversible adiabatic process is given by:

(1) 2.303 RT log (V2/V1)

(2)

(3) 2.303 RT log(V1/V2)

(4) none of these

Concept Questions :-

2nd Law and work done
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

Change in enthalpy for reaction,

2H2O2(l)$\to$ 2H2O(l) + O2(g)

if the heat of formation of H2O2(l) and H2O(l) are -188 and -286 kJ/mol respectively is

(1) -196 kJ/mol

(2) + 196 kJ/mol

(3) +948 kJ/mol

(4) -948 kJ/mol

Concept Questions :-

Enthalpy and Internal energy
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

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

(1) 40.0

(2) 42.3

(3) 44.0

(4) not defined, because pressure is not constant

Concept Questions :-

First Law of Thermodynamics
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

At absolute zero, the entropy of a perfect crystal is zero. This is........... of thermodynamics.

(1) the first law

(2) second law

(3) third law

(4) none of these

Concept Questions :-

Spontaneity and Entropy
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

At constant pressure and temperature, the direction of any chemical reaction is one where the...... decrease.

(1) entropy

(2) enthalpy

(3) Gibbs energy

(4) none of these

Concept Questions :-

Gibbs Energy Change
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

The work done by a mass less piston in causing an expansion $∆$V (at constant temperature), when the opposing pressure, P is variable, is given by:

(1) W= $-\int \mathrm{P}∆\mathrm{V}$

(2) W=0

(3) W= -P$∆$V

(4) none of these

Concept Questions :-

2nd Law and work done
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

Entropy decreases during:

(1) crystallization of sucrose from solution

(2) rusting of iron

(3) melting of ice

(4) vaporization of camphor

Concept Questions :-

Spontaneity and Entropy
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

Entropy change of vaporization at constant pressure is given by:

1.

2. $∆{\mathrm{S}}_{\mathit{\left(}v\mathit{\right)}}=\frac{∆{\mathrm{U}}_{v}}{\mathrm{T}}$

3.

4. None of these

Concept Questions :-

Spontaneity and Entropy
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

What is the entropy change for the reaction given below,

2H2 (g) + O2 (g) $\to$2H2O(l)

at temperature 300 K? Standard entropies of H2 (g), O2(g) and H2O(l) are 126.6, 201.20 and 68.0 JK-1mol-1 respectively.

(1) -318.4 JK-1mol-1                           .

(2) 318.4 JK-1mol-1

(3) 31.84 JK-1mol-1

(4) none of these

Concept Questions :-

Spontaneity and Entropy
NEET 2021 - Achiever Batch - Aryan Raj Singh

Difficulty Level:

If S$°$ for H2, Cl2 and HCl are 0.13, 0.22 and 0.19 kJ K-1mol-1 respectively. The total change in standard entropy for the reaction, H2 + Cl2 $\to$2HCl is:

(1) 30 J K-1mol-1

(2) 40 J K-1mol-1

(3) 60 J K-1mol-1

(4) 20 J K-1mol-1

Concept Questions :-

Spontaneity and Entropy