The formula for the compound tris ( ethane $-$ 1, 2 $-$ diamine ) cobalt ( III ) sulphate is :

[C o {(e n)}_{3}] S O_{4}

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[C o {(S O)}_{4} {(e n)}_{3}]

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[C o {(e n)}_{3}] {(S O_{4})}_{2}

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{[C o {(e n)}_{3}]}_{2} {(S O_{4})}_{3}

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Solution

The correct option is D ${[C o {(e n)}_{3}]}_{2} {(S O_{4})}_{3}$
tris(ethane-1,2-diamine)cobalt(III)sulphate:
Contains three molecules of ethane-1,2-diamine, sulphate ion $S O_{4}^{- 2}$ and $C o^{+ 3}$ . So formula of compound is $[C o (e n)_{3}]_{2} (S O_{4})_{3}$ .

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