JEE Main 2025 Jan 28 Shift 1, Chemistry Q3: Oxidation and Reduction

JEE Main2025Jan 28, Shift 1Chemistry

Match the List-I with List-II

List-I (Redox Reaction)		List-II (Type of Redox Reaction)
A	$CH_{4} (g) + 2 O_{2} (g) Δ CO_{2} (g) + 2 H_{2} O (l)$	(I)	Disproportionation reaction
B	$2 NaH (s) Δ 2 Na (s) + H_{2} (g)$	(II)	Combination reaction
C	$V_{2} O_{5} (s) + 5 Ca (s) Δ 2 V (s) + 5 CaO (s)$	(III)	Decomposition reaction
D	$2 H_{2} O_{2} (a q) Δ 2 H_{2} O (l) + O_{2} (g)$	(IV)	Displacement reaction

Choose the correct answer from the options given below :

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

Solution

Classify each reaction by what happens to the species involved:

(A) Methane combines with oxygen to give CO $_{2}$ and water. Two reactants form fewer products, so this is a combination reaction (II).

(B) Sodium hydride breaks apart on heating into sodium metal and hydrogen gas. A single compound splits into two species, so this is a decomposition reaction (III).

(C) Calcium reduces V $_{2}$ O $_{5}$ by taking its oxygen, displacing vanadium metal. This is a displacement reaction (IV).

(D) In H $_{2}$ O $_{2}$ , oxygen has the $- 1$ state and ends up partly as $0$ in O $_{2}$ and partly as $- 2$ in H $_{2}$ O. The same element is both oxidised and reduced, so this is a disproportionation reaction (I).

$∴$ A-II, B-III, C-IV, D-I.

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JEE Main 2025 Jan 28 Shift 1, Chemistry Q3: Oxidation and Reduction

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