Complete the following reaction:
$Zn + KOH \to$

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Solution

Zinc reacts with potassium hydroxide to form potassium zincate and evolve hydrogen gas.
$Zn + \underset{Potassium hydroxide}{2 KOH} \to \underset{Potassium zincate}{K_{2} {ZnO}_{2}} + H_{2} (↑)$
As we know, when a metal reacts with a base then salt is formed along with hydrogen gas evolved.
$M e t a l + B a s e \to S a l t + H y d r o g e n$
In this reaction potassium zincate $(K_{2} {ZnO}_{2})$ is salt.

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