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Q. Inorganic graphite is

Rajasthan PMTRajasthan PMT 2007The p-Block Elements

Solution:

(i) $ BN $ is borazon or boron nitride. It exists in two crystallographic modification. The hexagonal form has a simple layer structure similar to graphite. So it is called as inorganic graphite. The other form is cubic which is very hard and acts as insulator like diamond.
(ii) $B_2H_6$ is diborane