Which pair is not isomorphous?

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(B) Isomorphous substances have the same crystal structure and similar chemical composition. $NaF$ and $MgO$ are isomorphous as they have the same cry

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$CuSO_4 \cdot 5H_2O$ and $FeSO_4 \cdot 7H_2O$

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(B) Isomorphous substances have the same crystal structure and similar chemical composition. $NaF$ and $MgO$ are isomorphous as they have the same crystal lattice structure. $CaCl_2$ and $K_2S$ are isomorphous. $MgCO_3$ and $KNO_3$ are isomorphous. $CuSO_4 \cdot 5H_2O$ and $FeSO_4 \cdot 7H_2O$ are not isomorphous because they have a different number of water molecules of crystallization,which leads to different crystal structures.

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