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Which of the following is a redox reaction?

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$N a C l + {K N O}_{3} \to {N a N O}_{3} + K C l$

${C a C}_{2} O_{4} + 2 H C l \to {C a C l}_{2} + H_{2} C_{2} O_{4}$

$M g (O H)_{2} + 2 {N H}_{4} C l \to {M g C l}_{2} + 2 {N H}_{4} O H$

$Z n + 2 A g C N \to 2 A g + Z n (C N)_{2}$

answer is D.

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Detailed Solution

A redox reaction is a reaction in which oxidation and reduction takes place simultaneously.

In option 4 oxidation state of zinc changes from 0 to +2 that is oxidation is taking place and oxidation state of silver changes from +1 to 0 that is reduction takes place. Therefore, it is a redox reaction

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