When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel(II) chloride, the sequence of colour change observed will be: [2025]

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Q.
When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel(II) chloride, the sequence of colour change observed will be: [2025]

1 Pale Blue → Blue → Green → Violet

2 Violet → Blue → Pale Blue → Green

3 Pale Blue → Blue → Violet → Green

4 Green → Pale Blue → Blue → Violet

Ans.
(4)

$\begin{matrix} \underset{Green}{{[Ni(H_{2} O)_{6}]}^{2 +} (aq)} \underset{Pale blue}{\overset{en}{\to} {[Ni(H_{2} O)_{4} (en)]}^{2 +} (aq)} \end{matrix}$ $\overset{en}{\to}$ $\underset{Blue}{{[{Ni(H}_{2} {O)}_{2} {(en)}_{2}]}^{2 +} (aq)} \underset{Violet}{\overset{en}{\to} {[Ni(en)_{3}]}^{2 +} (aq)}$

Solution

Q.
When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel(II) chloride, the sequence of colour change observed will be: [2025]

1 Pale Blue → Blue → Green → Violet

2 Violet → Blue → Pale Blue → Green

3 Pale Blue → Blue → Violet → Green

4 Green → Pale Blue → Blue → Violet

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Solution

Q. When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel(II) chloride, the sequence of colour change observed will be: [2025]

1 Pale Blue → Blue → Green → Violet

2 Violet → Blue → Pale Blue → Green

3 Pale Blue → Blue → Violet → Green

4 Green → Pale Blue → Blue → Violet

Ans. (4) [Ni(H2O)6]2+(aq)Green→en[Ni(H2O)4(en)]2+(aq)Pale blue→en[Ni(H2O)2(en)2]2+(aq)Blue→en[Ni(en)3]2+(aq)Violet

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Q.
When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel(II) chloride, the sequence of colour change observed will be: [2025]