MHT CET · Chemistry · Solid State

What is the number of octahedral and tetrahedral voids presents respectively in 0.25 mole of a substance having hcp structure?

A \(3.011 \times 10^{23}, 1.50 \times 10^{23}\)
B \(6.011 \times 10^{23}, 3.011 \times 10^{23}\)
C \(3.011 \times 10^{23}, 6.022 \times 10^{23}\)
D \(1.50 \times 10^{23}, 3.011 \times 10^{23}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(1.50 \times 10^{23}, 3.011 \times 10^{23}\)

Step-by-step Solution

Detailed explanation

In HCP structure for each atom one octahedral void and two tetrahedral voids will be present.
No. Of atoms \(=0.25 \times \mathrm{N}_{\mathrm{A}}=0.25 \times 6.022 \times 10^{23}\)
No. of octahedral voids \(=0.25 \mathrm{~N}_{\mathrm{A}}\) \(=1.5 \times 10^{23}\)
No. of tetrahedral voids \(=2 \times 0.25 \times \mathrm{N}_{\mathrm{A}}\) \(=3.011 \times 10^{23}\)

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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