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Which of the following statements are incorrect?

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The co-ordination number of each type of ions in $C s C l$ crystals is 8

A metal which crystallises in $B C C$ structure has co-ordination number of 12

The Length of unit cell in $N a C l$ is $552 P m (r_{N a^{+}} = 95 P m, r_{C l^{-}} = 181 P m)$

A unit cell of an ionic crystals shares some of its ions with other unit cells

answer is B.

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A metal which crystallises in $B C C$ structure has co-ordination number of 8

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