First slide

13th group or boron group

Question

Which of the following is unreactive in air on heating?

Easy

A

Amorphous boron
B

Crystalline boron
C

Both 1 and 2
D

Aluminum

Solution

Crystalline boron is less reactive towards air due to having a closed packed structure of $B_{12}$ icosahedral units. The lattice is strong which makes crystalline boron unreactive or inert.

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