Q.

Lithium selenide can be described as a 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

Li2Se

b

LiSe

c

LiSe2

d

Li3Se

answer is A.

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Detailed Solution

Selenide ions occupy ccp =4Since there are 4 lattice points tetrahedral voids are 8.Lithium ions occuoy all tetrahedral voids =8Ratio of Li+ and Se-2  8 : 4 Thus, its formula will be Li2Se.
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