Assertion: Zinc blende and wurtzite both have fcc arrangement of $S^{2 -}$ ions.
Reason: A unit cell of both has four formula units of ZnS.

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 Asertion and Reason are not correct

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Solution

The correct option is E Both Asertion and Reason are not correct
Zinc blende has fcc arrangement of $S^{2 -}$ ions while wurtzite has hcp arrangement of $S^{2 -}$ ions.
A unit cell of zinc blende has $4$ formula units while that of wurtzite has $6$ formula units of ZnS.

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Assertion: Zinc blende and wurtzite both have fcc arrangement of S2− ions.Reason: A unit cell of both has four formula units of ZnS.

The correct option is E Both Asertion and Reason are not correctZinc blende has fcc arrangement of S2−ions while wurtzite has hcp arrangement of S2−ions.A unit cell of zinc blende has 4 formula units while that of wurtzite has 6 formula units of ZnS.

Assertion: Zinc blende and wurtzite both have fcc arrangement of $S^{2 -}$ ions.
Reason: A unit cell of both has four formula units of ZnS.

The correct option is E Both Asertion and Reason are not correct
Zinc blende has fcc arrangement of $S^{2 -}$ ions while wurtzite has hcp arrangement of $S^{2 -}$ ions.
A unit cell of zinc blende has $4$ formula units while that of wurtzite has $6$ formula units of ZnS.