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  4. Assertion NaOH cannot be stored in a vessel made of aluminium or zinc. Reason A protective layer of oxide is formed on the surface of the metal.

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Q. Assertion $NaOH$ cannot be stored in a vessel made of aluminium or zinc.
Reason A protective layer of oxide is formed on the surface of the metal.

AIIMSAIIMS 2014

Solution:

$NaOH$ reacts with $Al$ and $Zn$ both and forms soluble $NaAlO _{2}$ and $Na _{2} ZnO _{2}$ (sodium aluminate and sodium zincate) respectively.