Assertion: In the rock salt type structure, all the octahedral voids are occupied by $N a^{+}$ ions.
Reason: Number of octahedral voids $=$ Number of $C l^{-}$ ions in the packing.

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

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

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Assertion is correct but Reason is not correct

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Assertion is not correct but Reason is correct

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Both Assertion and Reason are not correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
In rock salt structure, $C l^{-}$ ions are present at ccp sites and $N a^{+}$ ions are present at all the octahedral voids.
In cubic closed packing, the number of octahedral voids is equal to the number of atoms at the ccp sites.

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Similar questions

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(a) Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

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(d) Assertion is wrong statement but Reason is correct statement.

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(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
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Assertion: In the rock salt type structure, all the octahedral voids are occupied by Na+ ions.Reason: Number of octahedral voids = Number of Cl− ions in the packing.

Assertion: In the rock salt type structure, all the octahedral voids are occupied by $N a^{+}$ ions.
Reason: Number of octahedral voids $=$ Number of $C l^{-}$ ions in the packing.