Question

What is/are true statement?

• A. Ions of $d$-block elements are colored due to $d-d$ transition
• B. Ions of $f$-block elements are colored due to $f-f$ transtition
• C. ${\left[Sc{\left(H_{2}O\right)}_6\right]}^{3+},{\left[Ti{\left(H_{2}O\right)}_6\right]}^{4+}$ are colored complexes.
• D. ${Cu}^{+}$ is colorless ion.

Answer 1

Answer: (A), (B), (D)

The correct options are
A Ions of $d$-block elements are colored due to $d-d$ transition
B Ions of $f$-block elements are colored due to $f-f$ transtition
D ${Cu}^{+}$ is colorless ion.

$C{u}^{+}$ is colourless because it doesn't contain any electrons which can absorb light. .

In ${\left[Sc{\left(H_{2}O\right)}_6\right]}^{3+}$, $S{c}^{3+}$ is $d^0$ system and hence colorless.

Hence,option C is incorrect.