✓ 3 MARKS
Short Answer
🔥 APPEARED IN 3 BOARD SETS
Give explanation for each of the following observations :
(a) With the same d-orbital configuration ($d^4$), $\text{Mn}^{3+}$ ion is an oxidising agent whereas $\text{Cr}^{2+}$ ion is a reducing agent.
(b) Actinoid contraction is greater from element to element than that among lanthanoids.
(c) Transition metals form large number of interstitial compounds with H, B, C and N.
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2025 | Series 56-4 | Set 1 | Question 24 |
| CBSE 2025 | Series 56-4 | Set 2 | Question 26 |
| CBSE 2025 | Series 56-4 | Set 3 | Question 22 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)