Test Preparation on IIT JEE Mains Mock Test-5

1.

CHEMISTRY
A solid has face centered cubic unit cell. If the
radius of the anion is 241.5 pm, the radius of the
cation is

In a face centered cubic arrangement each ion is surrounded by six oppositely charged ions, i.e., coordination number is six. Radius ratio for coordination number 6 is 0.414 – 0.732.
when = r+/r- = 0.414 ; r+/241.5=0.414
r+ =0.414 x 241.5 = 99.98 = 100 when r+/r-= 0.732 ;
r+ =0.732 x 241.5 = 176.77 Radius of cation should be between 100 – 176.7 pm

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