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Which among the following pairs of compounds is not isomorphous?
A. `NaNO_(3)` and `CaCO_(3)`
B. `K_(2)SO_(4)` and `K_(2)SeO_(4)`
C. NaCl and KCl
D. NaF and MgO

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Correct Answer - C
lsomorphous substance have generally similar chemical formulas and the polarisibility and the ratio of anion and cation radii are usually comparable. Crystals of isomorphous substances are almost identical. Among the given pair of compounds, NaCl and KCI are not isomorphous because they have different crystal structures.

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