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Assertion : Graphite is an example of tetragonal crystal system.
Reason : For a tetragonal system, $a=b \neq c$, $\alpha=\beta=90^{\circ}, \gamma=120^{\circ}$.
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Reason : For a tetragonal system, $a=b \neq c$, $\alpha=\beta=90^{\circ}, \gamma=120^{\circ}$.
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Verified Answer
The correct answer is:
Both assertion and reason are false statements.
Graphite has a two dimensional sheet structure. Each $\mathrm{C}$-atom is in $s p^2$ hybridised state and is linked to three other carbon atoms in a hexagonal planar structure.
For a tetragonal system, $a=b \neq c, \alpha=\beta=\gamma=90^{\circ}$. For a hexagonal system, $a=b \neq c, \alpha=\beta=90^{\circ}$, $\gamma=120^{\circ}$.
For a tetragonal system, $a=b \neq c, \alpha=\beta=\gamma=90^{\circ}$. For a hexagonal system, $a=b \neq c, \alpha=\beta=90^{\circ}$, $\gamma=120^{\circ}$.
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