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Q.

Which of the following is unreactive in air on heating?

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a

Amorphous boron

b

Crystalline boron

c

Both 1 and 2

d

Aluminum

answer is B.

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Detailed Solution

Crystalline boron is less reactive towards air due to having a closed packed structure of B12 icosahedral units. The lattice is strong which makes crystalline boron unreactive or inert.
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