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Question

When NaOH reacts with metal a X, the following reaction takes place:

NaOH+XNa2ZnO2+Y

Identify X and Y.


A

X is Na and Y is H2

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B

X is Cu and Y is H2O

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C

X is Zn and Y is H2O

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D

X is Zn and Y is H2

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Solution

The correct option is D

X is Zn and Y is H2


2NaOH+ZnNa2ZnO2+H2

When a base reacts with a metal it liberates hydrogen gas. Zinc reacts with sodium hydroxide to produce sodium zincate and hydrogen gas. This reaction takes place at a temperature of about 5500C.


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