Aluminium becomes passive in :

A

Conc. `HNO_(3)`

B

`HClO_(4)`

C

Both of these

D

None of these.

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The correct Answer is:

C

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Both Be and Al become passive on reaction with conc. nitric acid due to-

Metal which become passive with conc. HNO_(3)

Assertion (A) : Aluminum is passive towares conc HNO_2 Reason (R) : Due to formation of layer of nitrate on aluminium