1.

Assertion: The packing efficiency is maximum for the fcc structure. Reason: The co-ordination number is 12 in fcc structures.

Answer»

Assertion and REASON both are correct STATEMENT and reason is correct EXPLANATION for assertion. 
Assertion and reason both are correct statements but reason is not correct explanation for assertion. 
Assertion is correct statement but reason is wrong statement. 
Assertion is wrong statement but reason is correct statement. 

Solution :FCC is close packed structure.


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