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  4. Which complex among the following gives a white precipitate on treatment with an aqueous solution of barium chloride?

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Q. Which complex among the following gives a white precipitate on treatment with an aqueous solution of barium chloride?

MHT CETMHT CET 2019

Solution:

Among the given coordination compounds, $\left[ Co \left( NH _{3}\right)_{5} NO _{2}\right] SO _{4}$ gives a white precipitate on treatment with an aqueous solution of barium chloride. This can be explained by the following reaction.

$\left[ Co \left( NH _{3}\right)_{5} NO _{2}\right] SO _{4} + BaCl _{2}(a q) $
$\longrightarrow \left[ Co \left( NH _{3}\right)_{5} NO _{2}\right] Cl _{2}+ \underset{\text {White ppt.}}{BaSO _{4}(s)}$

The other given compounds do not give white ppt. due to absence of $SO _{4}^{2-}$ ions.