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  •  In following pairs, the one in which both transition metal ions are colourless is : Option: 1 <img alt="\mathrm{\mathrm{Sc}^{3+}, \mathrm{

 In following pairs, the one in which both transition metal ions are colourless is : 

Option: 1

\mathrm{\mathrm{Sc}^{3+}, \mathrm{Zn}^{2+}}


Option: 2

\mathrm{\mathrm{Ti}^{4+}, \mathrm{Cu}^{2+}}


Option: 3

\mathrm{\mathrm{V}^{2+}, \mathrm{Ti}^{3+}}


Option: 4

\mathrm{\mathrm{Zn}^{2+}, \mathrm{Mn}^{2+}}


Answers (1)

best_answer

We know the colours of some of the transition metal ions.

\mathrm{Sc^{3+}\longrightarrow 3d^{0}\longrightarrow colourless}
\mathrm{Ti^{4+}\longrightarrow 3d^{0}\longrightarrow colourless}
\mathrm{Ti^{3+}\longrightarrow 3d^{1}\longrightarrow purple}
\mathrm{V^{2+}\longrightarrow 3d^{3}\longrightarrow violet}
\mathrm{Hn^{2+}\longrightarrow 3d^{5}\longrightarrow pink}
\mathrm{Cu^{2+}\longrightarrow 3d^{9}\longrightarrow blue}
\mathrm{Zn^{2+}\longrightarrow 3d^{10}\longrightarrow colourless}

So, pair  \mathrm{Sc^{3+}\; and\; Zn^{2+}} are colourless.
Option (1) is correct.

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mansi

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