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AIIMS 2006
Exam
AIIMS
Year
2006
Subject
Chemistry
Chapter
Solid State

AIIMS 2006 · Chemistry · Solid State

Assertion : Graphite is an example of tetragonal crystal system....

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

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of the assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of the assertion
  3. CIf assertion is true, but reason is false
  4. DBoth assertion and reason are false statements.

Correct answer

D. Both assertion and reason are false statements.

Step-by-step solution

Graphite has a two dimensional sheet structure. Each C\mathrm{C}-atom is in sp2s p^2 hybridised state and is linked to three other carbon atoms in a hexagonal planar structure. For a tetragonal system, a=b≠c,α=β=γ=90∘a=b \neq c, \alpha=\beta=\gamma=90^{\circ}. For a hexagonal system, a=b≠c,α=β=90∘a=b \neq c, \alpha=\beta=90^{\circ}, γ=120∘\gamma=120^{\circ}.
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