Which of the following salt contain interstitial water molecule in it?

Which of the following salt contain interstitial water molecule in it?
  1. $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} .3 \mathrm{Cl}^{-}$
  2. $\mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O}$
  3. $\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\left(\mathrm{NH}_{3}\right)_{5}\right] \mathrm{Cl}_{2}$
  4. $\mathrm{BaCl}_{2} .2 \mathrm{H}_{2} \mathrm{O}$

Solution

$\mathrm{BaCl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}$ Interstitial water molecules can be found in $\mathrm{BaCl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}$ salt. Between the first and second solvation shells, water molecules are primarily trapped. It can be found in the crystal lattice's interstitial locations. Two interstitial water molecules in barium chloride dihydrate.

Asked in: MHT CET 2020 (16 Oct Shift 1)

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