MHT CET · Chemistry · Solid State

What are the number of octahedral and tetrahedral voids in 0.3 mole substance respectively if it forms hcp structure?

A \(1.8066 \times 10^{23}\) and \(3.6132 \times 10^{23}\)
B \(3.6132 \times 10^{23}\) and \(1.8066 \times 10^{23}\)
C \(6.022 \times 10^{23}\) and \(12.044 \times 10^{23}\)
D \(12.044 \times 10^{23}\) and \(6.022 \times 10^{23}\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(1.8066 \times 10^{23}\) and \(3.6132 \times 10^{23}\)

Step-by-step Solution

Detailed explanation

Number of atoms in \(0.3 \mathrm{~mol}\)
\(
\begin{aligned}
& =0.3 \times \mathrm{N}_{\mathrm{A}} \\
& =0.3 \times 6.022 \times 10^{23} \\
& =1.8066 \times 10^{23}
\end{aligned}
\)
i. For hep structure, Number of octahedral voids
\(=\) Number of atoms
\(
=1.8066 \times 10^{23}
\)
ii. For hcp structure, Number of tetrahedral voids
\(
\begin{aligned}
& =2 \times \text { Number of atoms } \\
& =2 \times 1.8066 \times 10^{23} \\
& =3.6132 \times 10^{23}
\end{aligned}
\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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