Aluminium becomes passive in...

Aluminium becomes passive in

A

conc `HNO_3`

B

`H_(2)Cro_(4)`

C

`HCIO_(4)`

D

conc.HCI

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The correct Answer is:

A, B, C

Due to formation of oxide layer on the sur face 3. X is NH,

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(A): Concentrated nitric acid makes metal aluminium passive (R): A protective layer of aluminium oxide is formed on the surface