JEE Main Chemistry · Coordination Compounds

Oxidation State Calculation

Oxidation State Calculation (Coordination Compounds) was asked 3 times in 3 JEE Main shifts, 2020–2024, out of the 42 shifts Lumi analysed. 1 of the 3 had a numerical answer.

Times asked: 3; in 3 shifts
Years: 2020–2024
Usual format: Single correct; Calculation
Pattern: Comes in cycles; repeats across shifts

How it is asked

Oxidation states in coordination compounds
Formula of complex from precipitation data

Difficulty

Easy 1Medium 2Hard 0

Where it sits

Chapter: Coordination Compounds. Topic: Coordination Nomenclature, 4 questions over 2 ideas.

Every time it came

All 3 questions

Newest first, each with its options and official answer.

8 Apr 2024, Shift 1 · Q70An octahedral complex with the formula $\mathrm{CoCl_3\cdot nNH_3}$ upon reaction with excess of $\mathrm{AgNO_3}$ solution gives 2 moles…MediumSingle correct
3 Aug 2021, Shift 2 · Q40The oxidation states of Fe in $\mathrm{[Fe(NCS)(NH_3)_5]SO_4}$ , $\mathrm{Na_3[Fe(S_2O_3)_3]}$ and $\mathrm{[Fe(CO)_5]}$ respectively areEasySingle correct
2 Sep 2020, Shift 1 · Q49The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are $x$ , $y$ and $z$ . The sum of $x$ , $y$ and $z$ is…MediumNumerical value