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Question

Which of the following are not isomorphous to each other?

A
BaSO4 and KMnO4
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B
KNO3 and NaClO4
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C
K2CO3 and K2SO3
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D
Na2CO3 and Mg(NO3)2
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Solution

The correct options are
A KNO3 and NaClO4
B K2CO3 and K2SO3
D Na2CO3 and Mg(NO3)2
In crystallography, crystals are described as isomorphous if they are closely similar in shape.

In order to form isomorphous crystals, two substances must have the same chemical formulation, they must contain atoms which have corresponding chemical properties and the sizes of corresponding atoms should be similar.

Out of these compounds, only BaSO4 and KMnO4 are isomorphous due to similar shape of anions.

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