The following reaction is given for reference:
4Fe(s) + 3O2(g)  → 2Fe2O3(s)
Also, for the oxidation of iron at 298 K, Hr°=-1648 x 103 J mol-1 & ∆S= -549.4 J K-1mol-1.

Based on the data given above, it can be concluded that the nature of the reaction is:

1. Spontaneous
2. Non-spontaneous
3. At Equilibrium
4. The nature of the reaction cannot be predicted.

Subtopic:  Spontaneity & Entropy |
 71%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

18 g of ice is converted into water at 0°C and 1 atm. The entropy of H2O(s) and H2O(l) are 38.2 and 60 J K-1 mol-1 respectively. the enthalpy for this conversion will be

(1) 5951.4 J/mol

(2) 595.14 J/mol

(3) -595.14 J/mol

(4) None of these

Subtopic:  Gibbs Energy Change |
 66%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

One mole of methanol when burnt in O2 gives out 723 kJ mol-1 heat. If one mole of O2 is used, what will be the amount of heat evolved?

1.  482 kJ           
2.  241 kJ
3.  723 kJ               
4.  924 kJ

Subtopic:  Thermochemistry |
 59%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

If the bond energies of H-H, Br-Br, and H-Br are 433, 192 and 364 kJ mol-1 respectively, 

the H° for the reaction

H2(g) + Br2(g) 2HBr(g) is

1.  -103 kJ               

2. -261 kJ

3. +103 kJ               

4. +261 kJ

Subtopic:  Enthalpy & Internal energy |
 57%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

If Hf°(C2H4) and Hf°(C2H6) are x1 and x2 kcal/mol then heat of hydrogenation of C2H4 is :-

(1) x1 + x2

(2) x1 - x2

(3) x2 - x1

(4) x1 + 2x2

Subtopic:  Thermochemistry |
 73%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

For given following equations and H° values, determine the enthalpy of reaction at 298 K for the reaction 

C2H4(g) + 6F2(g)  2CF4(g) + 4HF(g)

H2(g) + F2(g)  2HF(g)       H1°= -537 kJ

C(s) + 2F2(g) CF4(g)         H2°=-680 kJ

2C(s) + 2H2(g) C2H4(g)    H3°= 52 kJ

1. -1165 

2. -2486

3. +1165

4. +2486

Subtopic:  Enthalpy & Internal energy |
 82%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

What will be the standard enthalpy of reaction for the following reaction using the listed enthalpies of reaction:-

3Co(s) + 2O2(g)Co3O4(s);       H=?

2Co(s) + O2(g) 2CoO(s)          H1= -475.8 KJ

6CoO(s) + O2(g) 2Co3O4(s)     H2 = -355.0 KJ

(1) -891.2 KJ

(2) -120.8 KJ

(3) 891.2 KJ

(4) -830.8 KJ

Subtopic:  Enthalpy & Internal energy |
 65%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

At 25°C, for the process H2O(l)H2O(g);

G° is 8.6 kJ. The vapour pressure of water at this temperature is nearly:-

1. 24 torr

2. 285 torr

3. 32.17 torr

4. 100 torr

Subtopic:  Spontaneity & Entropy |
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

For isothermal expanison in case of an ideal gas:-

(1) G=S

(2) G=H

(3) G=-TS

(4) None of these

Subtopic:  Spontaneity & Entropy |
 53%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The free energy change G=0 when:-

(1) The system is at equilibrium

(2) Catalyst is added

(3) Reactants are initially mixed throughly

(4) The reactants are completely consumed

Subtopic:  Spontaneity & Entropy |
 93%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh