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A complex compound consists of 1 mole of ${Co}^{3 +}$ ion, 6 moles of ${NH}_{3},$ 6 moles of ${NO}_{2}^{-}$ and 1mole of ${Cr}^{3 +}$ ion. The complex has neither the highest value nor the lowest value of electrical conductivity. The possible formulae for the complex is/are

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$[Cr {({NH}_{3})}_{4} {({NO}_{2})}_{2}] [Co {({NH}_{3})}_{2} {({NO}_{2})}_{4}]$

$[Co {({NH}_{3})}_{5} ({NO}_{2})] [Cr ({NH}_{3}) {({NO}_{2})}_{5}]$

$[Co {({NH}_{3})}_{6}] [Cr {({NO}_{2})}_{6}]$

$[Cr {({NH}_{3})}_{5} ({NO}_{2})] [Co ({NH}_{3}) {({NO}_{2})}_{5}]$

answer is A, D.

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Detailed Solution

A & D are $2 : 2$ type electrolytes, which are intermediate between B & C.

Complex having + 3 and -3 charges have the highest conductivity while the complex having + 1 and -1 charge has the lowest electrical conductivity.

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