Which of the following is a redox reaction?

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(A) redox reaction is one in which oxidation and reduction occur simultaneously,involving a change in the oxidation states of the elements.In the reac

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$2Na[Ag(CN)_2] + Zn 	o Na_2[Zn(CN)_4] + 2Ag$

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(A) redox reaction is one in which oxidation and reduction occur simultaneously,involving a change in the oxidation states of the elements.In the reaction $2Na[Ag(CN)_2] + Zn 	o Na_2[Zn(CN)_4] + 2Ag$:$1$. The oxidation state of $Ag$ changes from $+1$ to $0$ (reduction).$2$. The oxidation state of $Zn$ changes from $0$ to $+2$ (oxidation).Since both oxidation and reduction occur,this is a redox reaction.Other options represent double displacement or acid-base type reactions without changes in oxidation states.

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