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2CuI →Cu + CuI_2.This reaction is

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detailed solution

Correct option is A

Reaction in which same element undergoes simultaneously both oxidation and reduction is disproportionation reaction In the given reaction oxidation state of Cu is decreased from +1 to zero and also increased from +1 to +2.2Cu+1I→Cu0+Cu+2I2 ;

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Match Column I with Column II and select the correct answer from given codes.

	Column I (Types of redox reactions)		Column II (Redox reactions)
A.	Combustion reaction	1.	${CH}_{4} (g) + 2 O_{2} \overset{Δ}{⟶} {CO}_{2} (g) + 2 H_{2} O (l)$
B.	Disproportionation reaction	2.	$2 NaH (s) \overset{Δ}{⟶} 2 Na (s) + H_{2} (g)$
C.	Decomposition reaction	3.	$S_{8} (s) + 12 {OH}^{-} (aq) ⟶ 4 S^{2 -} (aq) + 2 S_{2} O_{3} {}^{2 -}(aq) + 6 H_{2} O (l)$
D.	Displacement reaction	4.	${Cr}_{2} O_{3} (s) + 2 Al (s) \overset{Δ}{⟶} {Al}_{2} O_{3} (s) + 2 Cr (s)$