JEE Main 2020 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 2 September 2020, Shift 1, Chemistry Q49

Question 49 of 75 in this shift, Chemistry question 24 of 25.

The 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 ______. (A)

\mathrm{Na_4[Fe(CN)_5(NOS)]}

(B)

\mathrm{Na_4[FeO_4]}

(C)

\mathrm{[Fe_2(CO)_9]}

Official answer

6.00

NTA final key (Sep 2020).

Chapter: Coordination Compounds
Topic: Coordination Nomenclature
Idea tested: Oxidation State Calculation

Same idea in other shifts

Asked 3× in all

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

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.