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Question

The radius of a divalent cation A2+ is 94 pm and that of a divalent anion B2 is 146 pm. The compound AB has:

A
Rock salt structure
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B
Zinc blende structure
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C
Antifluorite structure
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D
Caesium chloride like structure
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Solution

The correct option is A Rock salt structure
Radius ratio of ionic compounds helps in determining the structure of compounds.


Radius of cation, r+=94 pm
Radius of anion, r=146 pm
Radius ratio,
r+r=94146=0.64
It is in the range of 0.4140.732, which represent octahedral type of structure.
Thus, it has the coordination number of 6.
Rock salt has the octahedral type of structure.
Hence, correct option is Rock salt structrue.

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