Assertion :BCC arrangement is less closely packed than CCP arrangement. Reason: In CCP arrangement, the two atoms at the corners of the unit cell are touching each other whereas in BCC arrangement, they are not touching each other.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Packing efficiency of BCC $= 68 %$

Packing efficiency of CCP/FCC $= 74 %$

Neither in CCP nor in BCC arrangement, the two atoms at the corners of the unit cell touch each other.

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Assertion :BCC arrangement is less closely packed than CCP arrangement. Reason: In CCP arrangement, the two atoms at the corners of the unit cell are touching each other whereas in BCC arrangement, they are not touching each other.

The correct option is C Assertion is correct but Reason is incorrectPacking efficiency of BCC =68%Packing efficiency of CCP/FCC =74%Neither in CCP nor in BCC arrangement, the two atoms at the corners of the unit cell touch each other.

The correct option is C Assertion is correct but Reason is incorrect
Packing efficiency of BCC $= 68 %$

Packing efficiency of CCP/FCC $= 74 %$

Neither in CCP nor in BCC arrangement, the two atoms at the corners of the unit cell touch each other.