Which among the following pairs of compounds | vedclass

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(C) Substances that possess the same crystal structure and similar chemical composition are called isomorphous. $NaNO_3$ and $CaCO_3$ are isomorphous

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$NaCl$ and $KCl$

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(C) Substances that possess the same crystal structure and similar chemical composition are called isomorphous. $NaNO_3$ and $CaCO_3$ are isomorphous (both have calcite structure). $K_2SO_4$ and $K_2SeO_4$ are isomorphous. $NaF$ and $MgO$ are isomorphous (both have rock salt structure). $NaCl$ and $KCl$ are not isomorphous because the ionic radii of $Na^+$ and $K^+$ are significantly different,leading to different crystal lattice parameters despite both having a face-centered cubic structure.

Which among the following pairs of compounds is $NOT$ isomorphous?

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