Pair of ions which gives blue colour in aqueo | vedclass

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Question

Most of the compounds of transition metals are coloured as a result of $d$-d transition. The transfer of electron from anion to cation takes face, whe

Vedclass · Accepted Answer

$V^{+4},\, Cu^{+2}$

Vedclass · Answer

Most of the compounds of transition metals are coloured as a result of $d$-d transition. The transfer of electron from anion to cation takes face, when ligand has free electrons. During this process energy is alesorleed, which is responsible for colour.

Colour of $Ni ^{2+}$ in aqueous state is $=$ Green

Colour of $V ^{4+}$ in aqueous state is Blue

Colour of $T_i{ }^{3+}$ in aquesous state is = Purple

Colour of $Co ^{2+}$ in aqueous state is $=$ Pink

Colour of $Fe ^{3+}$ in aqueous state is = Yellow

Colour of $Cu ^{2+}$ in aqueous state is = Blue

we know, that colour of $CuSO _4$ solution is blue)

So, $V ^{+4}$ and $Cu ^{+2}$ ions give blue colour in aqueous state.

Pair of ions - V ${ }^{+4}, Cu ^{+2}$ which give blue colour.

Pair of ions which gives blue colour in aqueous state :

$V^{+4},\,Ni^{+2},\, Ti^{+3}, \,Co^{+2}, \,Fe^{+3}, \,Cu^{+2}$

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