Which of the following reactions is the metal displacement reaction?

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2 K C l O_{3} Δ - \to 2 K C l + 3 O_{2}

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C r_{2} O_{3} + 2 A l Δ - \to A l_{2} O_{3} + 2 C r

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F e + 2 H C l \to F e C l_{2} + H_{2} ↑

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2 P b (N O_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2} ↑

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Solution

The correct option is B $C r_{2} O_{3} + 2 A l Δ - \to A l_{2} O_{3} + 2 C r$
More electropositive element displaces less electropositive element.
$C r_{2} O_{3} + 2 A l Δ - \to A l_{2} O_{3} + 2 C r$

Reaction (a) and (d) are decomposition reaction.

Reaction (c) is a single displacement reaction but it does not displace a metal.
Hence, option (b) is the correct answer.

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