Which of the following ions will exhibit colour in aqueous solutions?

Question

Which of the following ions will exhibit colour in aqueous solutions? (A) Sc3 +(.Z=21.) (B) La3 +(.Z=57.) (C) Ti3 +(.Z=22.) (D) Lu3 +(.Z=71.)

Tardigrade Admin · Accepted Answer

Here only Ti3 + has one unpaired electron so it gives colour in aqueous solution due to d-d e- transition. Rest ions are colourless as they don’t any un-paired electron so no d-d electronic transition.

Q. Which of the following ions will exhibit colour in aqueous solutions?

$S c^{3 +} (Z = 21)$

$L a^{3 +} (Z = 57)$

$T i^{3 +} (Z = 22)$

$L u^{3 +} (Z = 71)$

Here only $T i^{3 +}$ has one unpaired electron so it gives colour in aqueous solution due to d-d $e^{-}$ transition. Rest ions are colourless as they don’t any un-paired electron so no d-d electronic transition.

Q. Which of the following ions will exhibit colour in aqueous solutions?

Sc3+(Z=21)

La3+(Z=57)

Ti3+(Z=22)

Lu3+(Z=71)

Here only Ti3+ has one unpaired electron so it gives colour in aqueous solution due to d-d e− transition. Rest ions are colourless as they don’t any un-paired electron so no d-d electronic transition.

$S c^{3 +} (Z = 21)$

$L a^{3 +} (Z = 57)$

$T i^{3 +} (Z = 22)$

$L u^{3 +} (Z = 71)$

Here only $T i^{3 +}$ has one unpaired electron so it gives colour in aqueous solution due to d-d $e^{-}$ transition. Rest ions are colourless as they don’t any un-paired electron so no d-d electronic transition.