Assertion: The close packing of atoms in cubic structure is in the order: scp > bcc > ccp.

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

Both Assertion and Reason are correct and Reason is correct explanation of Assertion.

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Both Assertion and Reason are correct but Reason is not a correct explanation of Assertion.

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Assertion is wrong but Reason is correct.

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Assertion is correct but Reason is not correct.

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Solution

The correct option is C Assertion is wrong but Reason is correct.
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, FCC<BCC<SCP

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

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Assertion: The close packing of atoms in cubic structure is in the order: scp > bcc > ccp.Reason: Packing density=Volume of unit cella3

The correct option is C Assertion is wrong but Reason is correct.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, FCC<BCC<SCPPacking density=Volume of unit cella3

Assertion: The close packing of atoms in cubic structure is in the order: scp > bcc > ccp.

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