The radius of a divalent cation A2+ is 94pm and that of a divalent anion B2− is 146pm. 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+=94pm Radius of anion, r−=146pm
Radius ratio, r+r−=94146=0.64
It is in the range of 0.414−0.732, 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.