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Q.

Tris (ethane-1, 2-diammine) cobalt (III) sulphate is denoted by the formula

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a

[Co(en)]SO4

b

[Co(en)3]3(SO4)2

c

[Co(en)3]SO4

d

[Co(en)3]2(SO4)3

answer is D.

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Detailed Solution

tris(ethane-1,2-diamine)cobalt(III)sulphate:
Contains three molecules of ethane-1,2-diamine, sulphate ion SO4−2​ and Co+3. 

So formula of compound is [Co(en)3​]2​(SO4​)3​.

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