Classify redox reactions (combination, decomposition, displacement, disproportionation)

This type of question, asked 3 times: 6 Apr 2023, 6 Apr 2024, 28 Jan 2025. All 3 questions below, oldest first.

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Question 1
6 Apr 2023
45 $2\left\lbrack Au(CN)_{2} \right\rbrack_{(aq)}^{-}+ Zn(s) \rightarrow 2Au(s) +\left\lbrack Zn(CN)_{4} \right\rbrack^{2 -}\ _{(aq)}$
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Question 2

6 Apr 2024

136

N_{2}(g) + O_{2}(g) \rightarrow 2NO(g)

	List-I (Reaction)		List-II (Type of redox reaction)
(A)	$N_{2}(g) + O_{2}(g) \rightarrow 2NO(g)$	(I)	Decomposition
(B)	$2Pb(NO_{3})_{2}(s) \rightarrow 2PbO(s) + 4NO_{2}(g) + O_{2}(g)$	(II)	Displacement
(C)	$2Na(s) + 2H_{2}O(l) \rightarrow 2NaOH(aq) + H_{2}(g)$	(III)	Disproportionation
(D)	$2NO_{2}(g) + 2OH^{-}(aq) \rightarrow NO_{2}^{-}(aq) + NO_{3}^{-}(aq) + H_{2}O(l)$	(IV)	Combination

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28 Jan 2025

CH_{4}(g) + 2O_{2}(g) \overset{\Delta}{\rightarrow} CO_{2}(g) + 2H_{2}O(l)

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

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