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Q.

A solution of complex salt, $C r C l_{3} . 6 H_{2} O$ . having co-ordination no. 6 shows an osmotic pressure 73.89atm at 300K, when 1.0 molar solution of complex is used. One litre of this solution on treatment with excess of $A g N O_{3}$ solution $(α_{A g N O_{3}} = 1)$ leads to the formation of AgCl:

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a

2

b

1

c

1.5

d

3

answer is B.

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Detailed Solution

$π = C R T \times i$
$i = \frac{73.89}{1 \times 0.0821 \times 300} = 3$
Thus, $[C r {(H_{2} O)}_{5} C l] C l_{2} \cdot H_{2} O \to {[C r {(H_{2} O)}_{5} \cdot C l]}_{a q} + 2 C l_{a q}^{-}$
Or, 1 mole (mole $= M \times V_{i n} L)$ of complex will give 2 mol of $C l^{-}$
2 mole of $C l^{-}$ will give 2 mole of AgCl

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A solution of complex salt, CrCl3.6H2O. having co-ordination no. 6 shows an osmotic pressure 73.89atm at 300K, when 1.0 molar solution of complex is used. One litre of this solution on treatment with excess of AgNO3solution (αAgNO3=1) leads to the formation of AgCl: