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Physical Properties of Boron Family

Self protecti...

Question

Self protective metal among the following is:

A

Na

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B

Al

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C

Fe

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D

K

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Solution

The correct option is B Al
$A l$ when comes in contact with air to form $A l_{2} O_{3}$ which forms a protective passive layer on the metal. This layer cannot be removed by chemical means.

Hence, option B is correct.

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