Match the column
Column I | Column II |
(i) Temperature coefficient of the cell reaction is positive | [A] H2(g) + O2(g) → H2O (g) |
(ii) Exothermic reaction | [B] O2(g) ⎯→ 2CO2(g) + 3H2O(λ) |
(iii) Endothermic reaction | [C] C6H12O6(s) +6O2(g)→ 6CO2(g) + 6H2O(g) |
(iv) Spontantaneous reaction at any temperature | [D] H2(g) → 2H |
Text Solution
Verified by Experts(i) [C]; (ii) [A]; (iii) [D]; (iv) [C]
(i) [C],[D]
(ii) [A],[B],[C]
(iii) [D]
(iv) [C]
Sol.
( i ) Δ S° = nF 
If Δ S° > 0 than 
> 0
→ C,D → A,B,C
→ D, → C
For the reaction in which Δ H° <0 and Δ S° > 0 is spontaneous at any temperature
For reaction H 2 (g) + 
O 2 (g) ⎯→ H 2 O(g) Δ r H < O but Δ r S° < 0
C 2 H 6 (g) + 
O 2 (g) ⎯→ 2CO 2 (g) + 3H 2 O( λ ) Δ r H < O but Δ r S° < 0
C 6 H 12 O 6 (s) + 6O 2 (g) ⎯→ 6CO 2 (g) +6H 2 O(g) Δ r H° < 0 but Δ r S° > 0
H 2 (g) ⎯→ 2H (g) Δ r H° > 0 but Δ r S° > O
( ii ) Δ S° = nF 
If Δ S° > 0 than 
> 0
→ C,D → A,B,C
→ D, → C
For the reaction in which Δ H° <0 and Δ S° > 0 is spontaneous at any temperature
For reaction H 2 (g) + 
O 2 (g) ⎯→ H 2 O(g) Δ r H < O but Δ r S° < 0
C 2 H 6 (g) + 
O 2 (g) ⎯→ 2CO 2 (g) + 3H 2 O( λ ) Δ r H < O but Δ r S° < 0
C 6 H 12 O 6 (s) + 6O 2 (g) ⎯→ 6CO 2 (g) +6H 2 O(g) Δ r H° < 0 but Δ r S° > 0
H 2 (g) ⎯→ 2H (g) Δ r H° > 0 but Δ r S° > O
( iii ) Δ S° = nF 
If Δ S° > 0 than 
> 0
→ C,D → A,B,C
→ D, → C
For the reaction in which Δ H° <0 and Δ S° > 0 is spontaneous at any temperature
For reaction H 2 (g) + 
O 2 (g) ⎯→ H 2 O(g) Δ r H < O but Δ r S° < 0
C 2 H 6 (g) + 
O 2 (g) ⎯→ 2CO 2 (g) + 3H 2 O( λ ) Δ r H < O but Δ r S° < 0
C 6 H 12 O 6 (s) + 6O 2 (g) ⎯→ 6CO 2 (g) +6H 2 O(g) Δ r H° < 0 but Δ r S° > 0
H 2 (g) ⎯→ 2H (g) Δ r H° > 0 but Δ r S° > O
( iv ) Δ S° = nF 
If Δ S° > 0 than 
> 0
→ C,D → A,B,C
→ D, → C
For the reaction in which Δ H° <0 and Δ S° > 0 is spontaneous at any temperature
For reaction H 2 (g) + 
O 2 (g) ⎯→ H 2 O(g) Δ r H < O but Δ r S° < 0
C 2 H 6 (g) + 
O 2 (g) ⎯→ 2CO 2 (g) + 3H 2 O( λ ) Δ r H < O but Δ r S° < 0
C 6 H 12 O 6 (s) + 6O 2 (g) ⎯→ 6CO 2 (g) +6H 2 O(g) Δ r H° < 0 but Δ r S° > 0
H 2 (g) ⎯→ 2H (g) Δ r H° > 0 but Δ r S° > O
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