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Q.

Lithium selenide can be described as a cubic closest-packed array of selenide ions with lithium ions in all of the tetrahedral holes. Formula of lithium selenide is

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a

LiSe

b

LiSe2

c

Li2Se

d

Li3Se

answer is A.

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Detailed Solution

Se - CCP (Z = 4)
∴ Se4, for CCP T.V = 8
Li occupies all T.V = Li8
∴ Li8 Se4 or Li2Se

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