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NEET 1999 (AIPMT) · Other / Mixed

Other / Mixed question from NEET 1999 (AIPMT)

Q10NEET 1999 · AIPMTMedium

Other / Mixed

Sodium has body centred packing. If the distance between two nearest atoms is 3.7 Å then the lattice parameter is

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Answer: (c)

For BCC, nearest-neighbour distance $d = \frac{\sqrt{3}}{2}a$ .
$a = \frac{2 \times 3.7}{\sqrt{3}} = \frac{7.4}{1.732}$
$a \approx 4.27 \approx 4.3$ Å
So the answer is (c) 4.3 Å.

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