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Both Be and Al become passive on reaction with concentrated nitric acid due to

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The non-reactive nature of the metal

The non-reactive nature of the acid

The formation of an inert layer of oxide on the surface of the metals

Formation of the active layer of oxide on the surface of metals

answer is C.

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Detailed Solution

Be and Al become passive in reaction with concentrated nitric acid i.e., they do not actively participate in the reaction.

$Al + {concHNO}_{3} ⟶ No Reaction$

$Be + {concHNO}_{3} ⟶ No Reaction$

This is because the Al and Be together form a protective layer of oxides on the metal surface. Hence, no reaction takes place.

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