Question

Match List-I with the List-II

List-I Reaction	List-II Type of redox reaction
(A) N2(g) + O2(g) → 2NO(g)	(I) Decomposition
(B) 2Pb (NO3)2(s) → 2PbO(s) + 4NO2(g) + O2(g)	(II) Displacement
(C) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)	(III) Disproportionation
(D) 2NO2(g) + 2OH-(aq) → NO2-(aq) + NO3-(aq) + H2O(l)	(IV) Combination

Choose the correct answer from the options given below:

• A. (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
• B. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
• C. (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
• D. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)

Answer 1

The Correct Option is D

The problem requires matching each reaction from List-I with its corresponding redox reaction type in List-II.

Detailed Explanation:

1. (A) N₂(g) + O₂(g) → 2NO(g)
   This reaction exemplifies a Combination Reaction, where nitrogen and oxygen unite to form nitrogen monoxide. Such reactions involve the synthesis of a single product from two or more reactants.
2. (B) 2Pb(NO₃)₂(s) → 2PbO(s) + 4NO₂(g) + O₂(g)
   This reaction is a Decomposition Reaction, characterized by lead nitrate breaking down into lead oxide, nitrogen dioxide, and oxygen. Decomposition reactions involve the degradation of a compound into simpler substances.
3. (C) 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)
   This reaction illustrates a Displacement Reaction. In this context, sodium displaces hydrogen from water, yielding sodium hydroxide and hydrogen gas. Displacement reactions occur when an element replaces another within a compound.
4. (D) 2NO₂(g) + 2OH^-(aq) → NO₂^-(aq) + NO₃^-(aq) + H₂O(l)
   This reaction is a Disproportionation Reaction. These reactions are defined by a single element undergoing both oxidation and reduction. Here, nitrogen dioxide is simultaneously oxidized to nitrate (NO₃^-) and reduced to nitrite (NO₂^-).

Matching Summary:

List-I Reaction	List-II Type of Redox Reaction
(A) N2(g) + O2(g) → 2NO(g)	(IV) Combination
(B) 2Pb(NO3)2(s) → 2PbO(s) + 4NO2(g) + O2(g)	(I) Decomposition
(C) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)	(II) Displacement
(D) 2NO2(g) + 2OH-(aq) → NO2-(aq) + NO3-(aq) + H2O(l)	(III) Disproportionation

The correct pairings are (A)-(IV), (B)-(I), (C)-(II), and (D)-(III).