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Assertion . Graphite is an example to he...

Assertion . Graphite is an example to hexogonal crystal system.
Reason . For a tetragonal system, ` a = b ne c, alpha = beta = 90^(@) , gamma = 120^(@)`

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The correct Answer is:
c
Correct A. Graphite is an example of hexogonal crystal system ( Each C-atom is `sp^(2-)` hybridized and it linked to three other C-atoms in a hexagonal planar structure).
Correct R. For a tetragonal system ` a = b ne c, alpha = beta = gamma = 90^(@)` . For a hexagonal system ` a = b ne c, alpha = beta = 90^(@), gamma= 120^(@)` .
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