Questions
Which of the following is unreactive in air on heating?
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By Expert Faculty of Sri Chaitanya
a
Amorphous boron
b
Crystalline boron
c
Both 1 and 2
d
Aluminum
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Correct option is B
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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