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(B) The reaction $Cr(OH)_3 \downarrow + NH_3 	ext{ (excess)} \longrightarrow [Cr(NH_3)_6]^{3+}$ represents the dissolution of a precipitate into a co

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for coloured solution

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(B) The reaction $Cr(OH)_3 \downarrow + NH_3 	ext{ (excess)} \longrightarrow [Cr(NH_3)_6]^{3+}$ represents the dissolution of a precipitate into a complex ion.$Cr(OH)_3$ is a green-coloured precipitate.Upon adding excess $NH_3$,it forms the hexamminechromium$(III)$ ion,$[Cr(NH_3)_6]^{3+}$,which is a coloured solution (typically violet/purple).Therefore,this reaction corresponds to the formation of a coloured solution.

Assign $A, B, C, D$ from the given type of reaction.
$Cr(OH)_3 \downarrow + NH_3 \text{ (excess)} \longrightarrow [Cr(NH_3)_6]^{3+}$

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Assign $A, B, C, D$ from the given type of reaction.$Cr(OH)_3 \downarrow + NH_3 \text{ (excess)} \longrightarrow [Cr(NH_3)_6]^{3+}$