Question

____________  Boron is reactive with air.

(a) Neither crystalline nor amorphous

(b) Crystalline

(c) Both crystalline and amorphous

(d) Amorphous

I have been asked this question by my college director while I was bunking the class.

My query is from p-Block Elements in section p-Block Elements of Chemistry – Class 11

Answer 1

The correct choice is (d) Amorphous

Easiest explanation: Crystalline Boron is unreactive whereas amorphous Boron is reactive. It reacts with air at 700-degree centigrade, boron combines with oxygen and nitrogen separately to form its oxide and nitride.