✓ Board-verified
Chemistry · 2022 · 3 marks
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)3 marksUnderstandshort answer
CBSE 2022 · Region 5 · Set 3 · Q8
Give reasons for the following statements: (a) Transition elements and their compounds act as good catalysts. (b) E^o ( Mn^2+ / Mn ) value is highly…
Give reasons for the following statements :
(a)
Transition elements and their compounds act as good catalysts.
(b)
$\displaystyle \mathrm{E}^{\mathrm{o}}\left(\mathrm{Mn}^{2+} / \mathrm{Mn}\right)$ value is highly negative as compared to other elements.
(c)
$\displaystyle \mathrm{Cr}^{2+}$ is a strong reducing agent.
Marking-scheme solution
(a) Variable or multiple oxidation state / ability to form complexes / they provide large surface area for adsorption (utilises (n-$\displaystyle 1$) d and ns electrons for bonding).
(b) \(\displaystyle \mathrm{3d}^{5}\) or half-filled stable configuration in \(\displaystyle \mathrm{Mn}^{2+}\).
(c) because it changes to more stable +$\displaystyle 3$ oxidation state having \(\displaystyle \mathrm{t}_{2 \mathrm{~g}}{ }^{3}\) configuration.
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.