Which of the following pairs is not isomorphous?

B a S O_{4}, K M n O_{4}

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K C l O_{4}, K B F_{4}

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F e S O_{4} .7 H_{2} O, M g S O_{4} . 7 H_{2} O

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N a C l O_{3}, N a N O_{3}

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Solution

The correct option is D $N a C l O_{3}, N a N O_{3}$
Isomorphous structures are those that have the same shape.
Here, the shape of:
$C l O_{3}^{-} \to$ Pyramidal
$N O_{3}^{-} \to$ Planar
as predicted by VSEPR theory.
Hence, $N a C l O_{3}$ and $N a N O_{3}$ are not isomorphous.

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