JEE Main Chemistry question
Not in JEE Main or NEET syllabus
How many of the following metals crystallize in a cubic structure having 68% packing efficiency?
, , , , , , , .
Answer: 2
Solution
A packing efficiency of 68% corresponds specifically to the body-centred cubic (bcc) structure. Among the listed metals: (α-iron) and (an alkali metal) are bcc at ordinary conditions. , , and are all fcc (ccp, 74%
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