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Question

The product(s) formed in the following reaction is/are

Zn+2KOH (hot conc.) ______


A

K2ZnO2 + H2

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B

K2ZnO2

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C

ZnO2+H2+2K

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D

K2ZnO2 + H2O

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Solution

The correct option is A

K2ZnO2 + H2


Zinc reacts with hot concentrated caustic alkalis (NaOH, KOH) to give the corresponding soluble salt and liberate hydrogen. Here, zinc reacts with hot concentrated KOH to give potassium zincate(K2ZnO2) and hydrogen is released in the process.


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