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(B) $CrCl_3 \cdot 6 H_2 O$ exists as $[Cr(H_2 O)_6]Cl_3$,where $6$ water molecules are coordinated to the $Cr^{3+}$ ion.$BaCl_2 \cdot 2 H_2 O$ is a hy

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$I, III$ only

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(B) $CrCl_3 \cdot 6 H_2 O$ exists as $[Cr(H_2 O)_6]Cl_3$,where $6$ water molecules are coordinated to the $Cr^{3+}$ ion.$BaCl_2 \cdot 2 H_2 O$ is a hydrated salt where water molecules are present in the crystal lattice but not coordinated to the metal ion.$CuSO_4 \cdot 5 H_2 O$ exists as $[Cu(H_2 O)_4]SO_4 \cdot H_2 O$,where $4$ water molecules are coordinated to the $Cu^{2+}$ ion.Therefore,compounds $I$ and $III$ contain coordinated water.

The compounds having coordinated water are

$I$. $CrCl_3 \cdot 6 H_2 O$ $II$. $BaCl_2 \cdot 2 H_2 O$ $III$. $CuSO_4 \cdot 5 H_2 O$

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The compounds having coordinated water are $I$. $CrCl_3 \cdot 6 H_2 O$ $II$. $BaCl_2 \cdot 2 H_2 O$ $III$. $CuSO_4 \cdot 5 H_2 O$