Match the reactions in Column I with nature of the reactions/type of the products in Column II. Indicate your answer by darkening the appropriate bubbles of the $4 \times 4$ matrix given in the ORS. | Column I | Column II | |----------|----------| | (A) $\mathrm{O}_{2}^{-} \rightarrow \mathrm{O}_{2}+\mathrm{O}_{2}^{2-}$ | (p) redox reaction | | (B) $\mathrm{CrO}_{4}^{2-}+\mathrm{H}^{+} \rightarrow$ | (q) one of the products has trigonal planar structure | | (C) $\mathrm{MnO}_{4}^{-}+\mathrm{NO}_{2}^{-}+\mathrm{H}^{+} \rightarrow$ | (r) dimeric bridged tetrahedral metal ion | | (D) $\mathrm{NO}_{3}^{-}+\mathrm{H}_{2}\mathrm{SO}_{4}+\mathrm{Fe}^{2+} \rightarrow$ | (s) disproportionation |

JEE Advanced · 2007 · 08 Apr 2007 · Paper 2 · Redox Reactions and Electrochemistry

Match the reactions in Column I with nature of the reactions/type of the products in Column II. Indicate your answer by darkening the appropriate bubbles of the

4 \times 4

matrix given in the ORS.

Column I	Column II
(A) $O_{2}^{-} \to O_{2} + O_{2}^{2 -}$	(p) redox reaction
(B) $CrO_{4}^{2 -} + H^{+} \to$	(q) one of the products has trigonal planar structure
(C) $MnO_{4}^{-} + NO_{2}^{-} + H^{+} \to$	(r) dimeric bridged tetrahedral metal ion
(D) $NO_{3}^{-} + H_{2} SO_{4} + Fe^{2 +} \to$	(s) disproportionation

Answer: A → I, A → IV, B → III, C → I, C → II, D → I

Solution

(A)

O_{2}^{-}

undergoes disproportionation to

O_{2}

and

O_{2}^{2 -}

, which is also a redox reaction. Matches (p) and (s).

(B)

CrO_{4}^{2 -}

in acidic medium forms

Cr_{2} O_{7}^{2 -}

, which is a dimeric bridged structure with tetrahedral CrO₄ units. Matches (r).

(C)

MnO_{4}^{-}

oxidizes

NO_{2}^{-}

NO_{3}^{-}

(trigonal planar) while being reduced itself—a redox reaction. Matches (p) and (q).

(D)

NO_{3}^{-}

oxidizes

Fe^{2 +}

Fe^{3 +}

—a redox reaction. Matches (p).

JEE Advanced · 2007 · 08 Apr 2007 · Paper 2 · Match the columns

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JEE Advanced · 2007 · 08 Apr 2007 · Paper 2 · Redox Reactions and Electrochemistry

Solution

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