Metals that are passive by conc HNO₃ are i) Mg ii) Al iii) Fe iv) Cr v) Be

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i, ii, iii, v only

ii, iii, iv, v only

ii & v only

only v

answer is B.

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Detailed Solution

Nitric acid (dilute or conc.) renders aluminium and beryllium passive.
Because when metal comes into contact with nitric acid, an impervious layer of metal oxide is formed. This layer of metal oxide will prevent the nitric acid from coming into contact with the inner layer metal.

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