Assertion :The close packing of atoms in cubic structure follows the order:
FCC $>$ BCC $>$ SC
Reason: $Packing density = \frac{Volume occupied by atoms in a unit cell}{a^{3}}$

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Packing efficiency of SCP(simple cubic) $= 52 %$

Packing efficiency for BCC(body centred) $= 68 %$

Packing efficiency of CCP(cubic-closed/face-centred) $= 74 %$

The order of close packing would be, $F C C > B C C > S C P$

$Packing density = \frac{Volume of unit cell}{a^{3}}$

Hence, option A is correct.

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Assertion :The close packing of atoms in cubic structure follows the order:FCC > BCC > SC Reason: Packing density=Volume occupied by atoms in a unit cella3

Assertion :The close packing of atoms in cubic structure follows the order:
FCC $>$ BCC $>$ SC
Reason: $Packing density = \frac{Volume occupied by atoms in a unit cell}{a^{3}}$