The correct order of increasing electrical conductivity in aqueous solutions of the following complexes is:
I. $[P t (N H_{3})_{4}] C l_{4}$
II. $[C r (N H_{3})_{6}] C l_{3}$
III. $[C r (N H_{3})_{4} C l_{2}] C l$
IV. $K_{2} [P t C l_{6}]$

III < IV < II < I

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IV < II < III < I

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II < I < IV < III

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I < II < IV < III

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Solution

The correct option is A III < IV < II < I
The following complexes ionize in water to give ions as:
(i) $[P t (N H_{3})_{4}] C l_{4} \to$ 5 ions
(ii) $[C r (N H_{3})_{6}] C l_{3} \to$ 4 ions
(iii) $[C O (N H_{3})_{4} C l_{2}] C l \to$ 2 ions
(iv) $K_{2} [P t C l_{6}] \to$ 3 ions

Greater the number of ions, more will be the electrical conductivity of aqueous solution of the corresponding complex.

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