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The hydrides of boron are called boranes. 

1. How diborane reacts with ammonia? 

2. Account for the exceptional hardness of diamond.

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1. Diborane reacts with ammonia to give B2H6 .2NH3 

initially, which can be formulated as [BH2(NH3)2] [BH4]- . Further heating gives borazine, B3N3H6 known as ‘inorganic benzene’ in view of its ring structure with alternate B-H and N-H groups, 

2. In diamond, all the carbon atoms are in sp3 hybridised state. As a result of this hybridisation, a rigid three dimensional network of carbon atom is generated with directional covalent bonds throughout the lattice. It is very difficult to break this network structure.

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