โ 3 MARKS
Short Answer
๐ฅ APPEARED IN 3 BOARD SETS
(a) (i) On the basis of crystal field theory, write the electronic configuration for d^4 ion if ฮ_0 < P.
(ii) Using valence bond theory, predict the hybridization and magnetic character of [Ni(CN)_4]^{2-}.
(Atomic number of Ni = 28)
(iii) Write the formula of the following complex using IUPAC norms :
Dichlorobis (ethane-1,2-diamine) cobalt (III)
OR
(b) When a co-ordination compound NiCl_2ยท6H_2O mixed with AgNO_3, 2 moles of AgCl are precipitated per mole of the compound. Write
(i) Structural formula of the complex.
(ii) Secondary valency of โNiโ in the complex.
(iii) IUPAC name of the complex.
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2022 | Series 56-1 | Set 1 | Question 5 |
| CBSE 2022 | Series 56-1 | Set 2 | Question 4 |
| CBSE 2022 | Series 56-1 | Set 3 | Question 7(a) |
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)