Which of the following pairs of ions is not coloured in aqueous solution?

T i^{3 +}

and

V^{3 +}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C u^{+}

and

S c^{3 +}

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

C u^{2 +}

and

F e^{2 +}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C o^{2 +}

and

N i^{2 +}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C $C u^{+}$ and $S c^{3 +}$
The ions which have unpaired electrons are found to be coloured. Those with fully-filled or empty d-orbitals are mostly colourless.
Thus, $T i^{3 +} (3 d^{1}), V^{3 +} (3 d^{2}), C r^{3 +} (3 d^{3}), C u^{2 +} (3 d^{9}), F e^{3 +} (3 d^{5})$ and $C o^{2 +} (3 d^{2})$ are all coloured due to $d - d$ transition as they have unpaired elctrons.
Only $S c^{3 +} (3 d^{0})$ and $C u^{+} (3 d^{10})$ ions are colourless since they have no unpaired electron.

Suggest Corrections

Similar questions

T i^{3 +}, V^{3 +}

C u^{+}, S c^{3 +}

F e^{2 +}, F e^{3 +}

C o^{2} +, N i^{2 +}

Z n^{2 +}, A g^{+}

T i^{3 +}, V^{3 +} (i i) C u^{+}, S c^{3 +} (i i i) F e^{2 +}, F e^{3 +} (i v) C o^{2 +}, N i^{2 +} (v) Z n^{2 +}, A g^{+}

$(i) T i^{3 +}, V^{3 +} (i i) C u^{+}, S c^{3 +} (i i i) F e^{2 +}, F e^{3 +} (i v) C o^{2 +}, N i^{2 +} (v) Z n^{2 +}, A g^{+}$

S c^{3 +}

T i^{3 +}

C u^{+}, F e^{2 +}, M n^{2 +}, C r^{3 +}, S c^{3 +}, T i^{4 +}

Join BYJU'S Learning Program