Assertion (A) White tin is an example of tetragonal system. Reasoning (R) For a tetragonal system $a=b=c$…
Assertion (A) White tin is an example of tetragonal system.Reasoning (R) For a tetragonal system $a=b=c$ and $\alpha=\beta=\gamma \neq 90^{\circ}$. The correct answer is
(A) and (R) are true and (R) is the correct explanation of $(\mathrm{A})$.
Both (A) and (R) are true and (R) is not the correct explanation of (A).
(A) is true but (R) is not true.
(A) is not true but (R) is true.
Solution
White tin, an allotropic form of tin is an example of tetragonal system and for tetragonal system, one side is not equal to other two while all the angles are equal, ie, $a=b \neq c$ and $\alpha=\beta=\gamma=90^{\circ}$.
Hence, Assertion (A) is true but Reason (R) is not.