Question

Choose correct option:-
1. Zinc forms colored ions
2. $[Co{F}_6{]}^{3-}$ is paramagnetic
3.Sc forms +4 oxidation state
4. Zinc is not a transition element

• A. 1 and 2
• B. 1 and 3
• C. 2 and 4
• D. 3 and 4

Answer 1

The correct option is C 2 and 4

Option 1- $Z{n}^{2+}$ has no unpaired electrons, it is diamagnetic and thus, colorless.

Option 2- In co-ordination compound $[Co{F}_6{]}^{3-}$, $C{o}^{3+}$ has 4 unpaired electrons, thus, it is paramagnetic.

Option 3- Maximum oxidation state shown by Sc is +3.

Option 4- Zinc atom has completely filled d orbitals $\left(3d^{10}\right)$ in its ground state as well as in its oxidised state, hence it is not regarded as a transition element.