JEE Main · 2024 · Shift-IImediumRDX-008

Match List-I with List-II. | List-I (Reaction) | List-II (Type) | |---|---| | (A) N2(g) + O2(g) 2NO(g) | (I)…

Redox Reactions · Class 11 · JEE Main Previous Year Question

Question

Match List-I with List-II.

| List-I (Reaction) | List-II (Type) | |---|---| | (A) N2(g)+O2(g)→2NO(g)\mathrm{N_{2(g)} + O_{2(g)} \rightarrow 2NO_{(g)}} | (I) Decomposition | | (B) 2Pb(NO3)2(s)→2PbO(s)+4NO2(g)+O2(g)\mathrm{2Pb(NO_3)_{2(s)} \rightarrow 2PbO_{(s)} + 4NO_{2(g)} + O_{2(g)}} | (II) Displacement | | (C) 2Na(s)+2H2O(l)→2NaOH(aq)+H2(g)\mathrm{2Na_{(s)} + 2H_2O_{(l)} \rightarrow 2NaOH_{(aq)} + H_{2(g)}} | (III) Disproportionation | | (D) 2NO2(g)+2OH(aq)−→NO2(aq)−+NO3(aq)−+H2O(l)\mathrm{2NO_{2(g)} + 2OH^{-}_{(aq)} \rightarrow NO_{2(aq)}^{-} + NO_{3(aq)}^{-} + H_2O_{(l)}} | (IV) Combination |

Choose the correct answer from the options given below:

Options
  1. a

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

  2. b

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

  3. c

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

    ✓
  4. d

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

Correct Answerc

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

Detailed Solution

Step 1 — Classify each reaction:

(A) N2+O2→2NO\mathrm{N_2 + O_2 \rightarrow 2NO}: Two elements combine to form a single compound → Combination reaction (IV) ✓

(B) 2Pb(NO3)2→2PbO+4NO2+O2\mathrm{2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2}: A single compound breaks into multiple products → Decomposition reaction (I) ✓

  • N in NO3−\mathrm{NO_3^-}: +5+5; in NO2\mathrm{NO_2}: +4+4 (reduced); O in NO3−\mathrm{NO_3^-}: −2-2; in O2\mathrm{O_2}: 00 (oxidised) → also a redox decomposition

(C) 2Na+2H2O→2NaOH+H2\mathrm{2Na + 2H_2O \rightarrow 2NaOH + H_2}: Na (0) displaces H (+1+1 → 0) from water → Displacement reaction (II) ✓

(D) 2NO2+2OH−→NO2−+NO3−+H2O\mathrm{2NO_2 + 2OH^- \rightarrow NO_2^- + NO_3^- + H_2O}: N in NO2\mathrm{NO_2}: +4+4; in NO2−\mathrm{NO_2^-}: +3+3 (reduced); in NO3−\mathrm{NO_3^-}: +5+5 (oxidised) Same element (N) simultaneously oxidised and reduced → Disproportionation (III) ✓

Answer: Option (3) — A-IV, B-I, C-II, D-III

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