When Ethane-1,2-diamine is added progressivel | vedclass

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Question

(C) The reaction proceeds in steps as the ligand Ethane-$1,2$-diamine $(en)$ replaces water molecules in the coordination sphere of the Nickel $(II)$

Vedclass · Accepted Answer

Green $\rightarrow$ Pale Blue $\rightarrow$ Blue $\rightarrow$ Violet

Vedclass · Answer

(C) The reaction proceeds in steps as the ligand Ethane-$1,2$-diamine $(en)$ replaces water molecules in the coordination sphere of the Nickel $(II)$ ion: $1$. $[Ni(H_2O)_6]^{+2} + en \rightarrow [Ni(H_2O)_4(en)]^{+2} + 2H_2O$ (Green) $2$. $[Ni(H_2O)_4(en)]^{+2} + en \rightarrow [Ni(H_2O)_2(en)_2]^{+2} + 2H_2O$ (Pale Blue) $3$. $[Ni(H_2O)_2(en)_2]^{+2} + en \rightarrow [Ni(en)_3]^{+2} + 2H_2O$ (Violet/Blue) Thus,the sequence of colour change is Green $\rightarrow$ Pale Blue $\rightarrow$ Blue/Violet.

When Ethane-$1,2$-diamine is added progressively to an aqueous solution of Nickel $(II)$ chloride,the sequence of colour change observed will be :

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