Assertion :Graphite is an example of tetragonal crystal system. Reason: For a tetragonal system, $a = b \neq c, α = β = 90^{\circ}, γ = 120^{\circ}$ .

Both assertion and reason are correct and reason is the correct explanation for assertion

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Both assertion and reason are correct but reason is not the correct explanation for assertion

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Assertion is correct but reason is incorrect

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Both assertion and reason are incorrect

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Solution

The correct option is D Both assertion and reason are incorrect
Graphite is an example of hexagonal system for which $α = β = 90^{\circ}$ and $γ = 120^{\circ}$ and $a = b \neq c$ .
So, $A s s e r t i o n$ is false.
$R e a s o n$ is also false as for tetragonal system $a = b \neq c$ and $α = β = γ = 90^{\circ}$ .

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Assertion :Graphite is an example of tetragonal crystal system. Reason: For a tetragonal system, a=b≠c,α=β=90∘,γ=120∘.

The correct option is D Both assertion and reason are incorrectGraphite is an example of hexagonal system for which α=β=90∘ and γ=120∘ and a=b≠c. So, Assertion is false.Reason is also false as for tetragonal system a=b≠c and α=β=γ=90∘.

Assertion :Graphite is an example of tetragonal crystal system. Reason: For a tetragonal system, $a = b \neq c, α = β = 90^{\circ}, γ = 120^{\circ}$ .