Q.

BaCl2.  2H2O (Barium chloride dihydrate) contains ____ ?

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a

Interstitial water molecule

b

Co-ordinate water molecule

c

Hydrogen bonded water

d

Ionic bonded water molecule

answer is A.

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Detailed Solution

Water of crystallization in BaCl2.  2H2O remains embedded in the interstitial voids or spaces within the crystal lattice of BaCl2 . The binding force is the electrostatic interaction between the barium ion and the lone pairs of the water molecule. This hydrated barium chloride has a monoclinic crystal structure ( refer Solid State ).
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