The only element of group 13 which does not form a passive layer on the surface while dissolving in con. $H N O_{3}$ , but dissolve to form complex is:

boron

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aluminium

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both

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none

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Solution

The correct option is A boron
Boron does not usually react with acids and alkalis but it reacts with acids and alkalis in only highly divided state. When it reacts with $H N O_{3}$ it gives Boric acid. The reaction occurs at high temperature.
$B + 3 H N O_{3} ⟶ H_{3} {B O}_{3} + 3 {N O}_{2}$ which is complex in nature.

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