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Q.

A solution of $Cr {({NO}_{3})}_{2}$ slowly turns green when concentrated hydrochloric acid is added because of the formation of

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a

${CrCl}_{3}$

b

${CrO}_{2}^{-}$

c

Chloro complexes

d

${Cr}_{2} O_{3}$

answer is D.

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Detailed Solution

The reaction is,

$\begin{aligned} Cr {({NO}_{3})}_{2} + 3 HCl + (H_{2} O ⟶ \\ [(Cr {(H_{2} O)}_{6}] {Cl}_{3} + 3 {HNO}_{3} \end{aligned}$

which is chloro complexes.

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