Solid StateHard

Question

Ammonium chloride crystallizes in a body-centred cubic lattice with edge length of unit cell equal to 387 pm. If the radius of Cl- ion is 181 pm, the radius of NH4+ ion would be approximately-

Options

A.116 pm
B.154 pm
C.174 pm
D.206 pm

Solution

In bcc,
2(rNH4+ + rCl-) = √3a

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