✓ Board-verified
Chemistry · 2022 · 3 marks
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)3 marksAnalyseshort answer
CBSE 2022 · Region 1 · Set 3 · Q10
Following ions of 3d transition series are given: Ti^2+, Fe^2+, Cu^2+, Zn^2+ (Atomic number: Ti =22, Fe =26, Cu =29, Zn =30 ) Identify the ion, which…
Following ions of 3d transition series are given : \[\mathrm{Ti}^{2+}, \mathrm{Fe}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Zn}^{2+} \] (Atomic number : $\displaystyle \mathrm{Ti}=22, \mathrm{Fe}=26, \mathrm{Cu}=29, \mathrm{Zn}=30$ ) Identify the ion, which is
(i)
a strong reducing agent in aqueous solution.
(ii)
more stable than its +$\displaystyle 1$ oxidation state.
(iii)
colourless in aqueous solution. Give a suitable reason in each.
Marking-scheme solution
(i)
\(\displaystyle \mathrm{Fe}^{2+}\), Fe is more stable in \(\displaystyle \mathrm{Fe}^{3+}\) due to half-filled \(\displaystyle \mathrm{d}^{5}\) configuration.
(ii)
\(\displaystyle \mathrm{Cu}^{2+}\), due to high \(\displaystyle \Delta_{\mathrm{hyd}} H^{\circ}\) of \(\displaystyle \mathrm{Cu}^{2+}\) than \(\displaystyle \mathrm{Cu}^{+}\).
(iii)
\(\displaystyle \mathrm{Zn}^{2+}\), no unpaired electrons / no d-d transition.
All The d-and f-Block Elements questions2022 question paperNCERT solutions: The d-and f-Block ElementsPractice The d-and f-Block Elements →
More from The d-and f-Block Elements
- Assertion: Transition metals show their highest oxidation state with oxygen. Reason (R): The ability of oxygen to form multiple bonds to metals.2023 · asked 2×
- Which of the following transition metals shows +1 and +2 oxidation states?2026 · asked 2×
- Assertion: Actinoids show wide range of oxidation states. Reason (R): Actinoids are radioactive in nature.2025 · asked 2×
- With increase in atomic number, the melting point of transition metals:2025
- In which of the following does the central atom exhibit an oxidation state of+3?2023
- (i) Silver atom has completely filled d-orbitals in its ground state, it is still considered to be a transition element. Justify the statement. (ii)…2022
- Give reasons for the following statements: Copper does not displace hydrogen from acids. Transition metals and most of their compounds show…2022
- Which one among the following metals of 3d series has the lowest melting point?2023
CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.