Question

Choose the correct option
(a) White tin is the examples of Tetragonal crystal system, it's all axial distance is
same and axial angles are also same. Density decreases Schottky defects.
(b) The coordination number of oxygen in Na20 is 8. Density decreases in Frenkel
defects.
(c) For 0.413 radius ratio possible co-ordination number is 4 and structural
arrangement is tetrahedral. Packing efficiency of bcc arrangement is 68% so its
vacant space is 22%.
(d) Total number of atoms present in one unit cell of HCP lattice is 6 so its total
number of tetrahedral and octahedral voids is 18. For an atom to occupy an
octahedral void, its radius must be 0.414 times the radius of the sphere.​

Answer 1

Answer:

d is correct

Explanation:

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Answer 2

Answer:

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