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  4. The correct formula of the complex tetraammineaquachlorocobalt (III) chloride is

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Q. The correct formula of the complex tetraammineaquachlorocobalt (III) chloride is

VITEEEVITEEE 2010

Solution:

The correct formula of the complex tetraammine aqua chlorocobalt (III) chloride is $\left[ CoCl \left( H _{2} O \right)\left( NH _{3}\right)_{4}\right] Cl _{2}$, because in it the oxidation number of Co is $+3$.
${\left[ CoCl \left( H _{2} O \right)\left( NH _{3}\right)_{4}\right] Cl _{2}}$
$x+(-1)+0+(0 \times 4)+(-1) 2=0$
$x-3=0$
$x=+3$