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  4. 3 moles of metal complex with formula Co ( en )2 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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Q. $3$ moles of metal complex with formula $Co ( en )_{2} Cl _{3}$ 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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Solution:

$3\left[ Co ( en )_{2} Cl _{2}\right] Cl +\underset{\text { (excess) }}{ AgNO _{3}} \rightarrow \underset{\text { (white ppt.) }}{3 AgCl }$
Secondary valency of $Co =6$