The form of BN which is as hard as diamond is

The form of BN which is as hard as diamond is

  1. A

    hexagonal form

  2. B

    cubic form with ZnS structure

  3. C

    Both of these

  4. D

    none of these

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    Solution:

    BN is boron nitride and present in two forms, hexagonal form and cubic form. Its hexagonal form has a similar structure of graphite and is soft as that of graphite, whereas the cubic form of BN is hard as a diamond.

    ZnS has FCC structure and if cubic forms of BN is similar to ZnS, then BN becomes as hard as diamond.

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