Question

The efficiency of packing is 68% in

• A. BCC structure
• B. CCP structure
• C. FEC structure
• D. HEP structure

Hint:

The packing efficiency for the BCC structure is lower compared to FCC and HCP structures.

Answer 1

The Correct Option is A

Step 1: Understanding the Efficiency of Packing
In crystal structures, the packing efficiency refers to the fraction of the volume occupied by atoms in a unit cell.

Step 2: Explanation of BCC Structure
In a Body-Centered Cubic (BCC) structure, the packing efficiency is 68%.
This means that 68% of the volume of the unit cell is occupied by atoms.
Step 3: Why Other Options are Incorrect
Option (b) CCP structure (also called FCC) has a packing efficiency of 74%, which is greater than that of BCC.

Option (c) FEC structure is not a standard name for a crystal structure.
Option (d) HEP structure does not refer to any standard crystal packing arrangement.

Step 4: Conclusion
Thus, the efficiency of packing in a BCC structure is 68%.