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Relation between Coefficient and Indices of x and y

The radius of...

Question

The radius of $N a^{+}$ is 95 pm and that of $C l^{-}$ is 181 pm. The edge length of unit cell in NaCl would be

A

181 pm

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B

95 pm

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C

276 pm

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D

552 pm

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Solution

The correct option is D 552 pm
Edge length $= 2 (r_{c} + r_{a})$
= 2(181 + 95) = 552 pm

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