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Q.

Which complex compound is most stable?

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a

$[CoCl (en)_{2}] {NO}_{3}$

b

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

c

${[Co {({NH}_{3})}_{6}]}_{2} {({SO}_{4})}_{3}$

d

$[Co {({NH}_{3})}_{4} (H_{2} O) Br] {({NO}_{3})}_{2}$

answer is D.

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Detailed Solution

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Ethylene diamine, shows chelation with central metal, and hence, gives more stability.

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