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Assertion: Hexagonal close packing in mo...

Assertion: Hexagonal close packing in more light than cubic close packing.
Reason: Hexagonal close packing has C.N of 12 whereas cubic close packing has C.N. of 8.

A

If both assertion and reason are correct and reason is correct explanation for assertion

B

If both assertion and reason are correct but reason is not correct explanation for assertion

C

If assertion is correct but reason is incorrect

D

If both assertion and reason are incorrect

Text Solution

Verified by Experts

The correct Answer is:
D
Correct Assertion: Both hexagonal and cubic close packing are equally tight (occupied space =`74%`)
Correct Reason: The co-ordination number in both the cases is 12.
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Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is the maximum and the contituents occupy the maximum available space. In two dimensions, there are hexagonal close packing and cubic close packing. In three dimentions, there are hexagonal, cubic as well as body centred close packings. A certain oxide of a metal M crystallises in such a way that O^(2-) ions occupy hcp arrangement following ABAB... pattern. The metal ions however occupy 2//3 rd of the octahedral voids. The formula of the compound is :

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