Question

The metal which displces hydrogen from a boiling caustic soda solution is a) Mg b) Fe c) As d) Zn ​

Answer 1

Explanation:

In electrochemical series, zinc is prior than Hydrogen. So Zn displaces H

2

from NaOH forming Sodium Zincate. But it doesn't replace Na because of high reactivity of Sodium.

2NaOH+Zn→Na

2

ZnO

2

+H

2

↑

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