Question

Graphite is an example of tetragonal crystal system. For a tetragonal system, $a=b \neq c, \alpha=\beta$ $=90^{\circ}, \gamma=120^{\circ}$

• A. If both assertion and reason are true and reason is the correct explanation of the assertion
• B. If both assertion and reason are true but reason is not the correct explanation of the assertion
• C. If assertion is true, but reason is false
• D. Both assertion and reason are false statements

Answer 1

Answer: (D)

Both assertion and reason are false statements

Answer 2

Like quartz and ice, graphite is an example of hexagonal system for this $\alpha=\beta=90^{\circ}$ and $\gamma=120^{\circ}$ and $a = b \neq c$. For a tetragonal system $\alpha, \beta=\gamma=90^{\circ}$ and $a=b \neq c$