3 moles of metal complex|Coordination Compounds|JEE MAIN2021

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3 moles of metal complex with formula $\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_3$ gives 3 moles of silver chloride on treatment with excess of silver nitrate. The secondary valency of Co in the complex is $\_\_\_\_$ . (Round off to the nearest integer)

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