5 moles of an ideal gas expands isothermally and irreversibly from a pressure of 10 atm to 1 atm against a constant external pressure of 1 atm. find the Wirr at 300 K:-

1. -15.921 kJ

2. -11.224 kJ

3. -110.83 kJ

4. None of these

Subtopic:  2nd & 3rd Law of Thermodynamics |
 58%
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

In the reaction at 300 K

H2(g) + Cl2(g)2HCl(g)       H°= -185 kJ

if 2 mol of H2 completely react with 2 mole of Cl2 to form HCl. What is U° for this reaction?

(1) 0

(2) -185 kJ

(3) -370 kJ

(4) None of these

Subtopic:  Enthalpy & Internal energy |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Predict which of the following reaction(s) has a positive entropy change?

(i) Ag+ (aq) + Cl-(aq) AgCl(s)

(ii) NH4Cl(g) NH3(g) + HCl(g)

(iii) 2NH3(g)N2(g) + 3H2(g)

(1) i & ii

(2) iii

(3) ii & iii

(4) ii

 

Subtopic:  Spontaneity & Entropy |
 85%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

When two moles of an ideal gas (Cp, m=52R) heated from 300 K to 600 K at constant pressure the change in entropy of gas (S) is:-

(1) 32Rln2

(2) -32Rln2

(3) 7R ln 2

(4) 5 Rln2

Subtopic:  Cp & Cv |
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NEET 2023 - Target Batch - Aryan Raj Singh
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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
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NEET 2023 - Target Batch - Aryan Raj Singh

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%
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Hints

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 |
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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
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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
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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%
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