Which one of the following equations represents a redox reaction?

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${PCl}_{3} + 3 H_{2} O \to H_{3} {PO}_{3} + 2 HCl$

$2 {NF}_{2} H + 2 KF \to 2 {KHF}_{2} + N_{2} F_{2}$

${NI}_{3} + 3 H_{2} O + HI \to 2 HOI + {NH}_{4} OH + I_{2}$

$2 KI + Pb {({NO}_{3})}_{2} \to {PbI}_{2} + 2 {KNO}_{3}$

answer is C.

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Detailed Solution

The equations represents a redox reaction is ${NI}_{3} + 3 H_{2} O + HI \to 2 HOI + {NH}_{4} OH + I_{2}$ .Redox reactions are chemical processes that include oxidation and reduction and involve a change in the oxidation state of the reactants. Redox is the abbreviation for reduction-oxidation. The two distinct processes of reduction and oxidation may be used to summaries all redox reactions.

Hence, correct option is C.

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