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 7× in all

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30 Jul 2022, Shift 2 · Q50In the ring test of $\mathrm{NO_3^-}$ ion what is the oxidation number of iron in the complex (brown ring)…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
4 Aug 2021, Shift 1 · Q57Among the following species, the number of species with oxidation state of Fe in +3 is ________. A.…MediumNumerical valueHas a figure
4 Aug 2021, Shift 2 · Q38The oxidation states of Mn in $\mathrm{Mn_2(CO)_{10}}$ , $\left[\mathrm{Mn(CO)_5Br}\right]$ and $\mathrm{K}\left[\mathrm{Mn(CN)_6}\right]$ …EasySingle 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 108 of the 174 JEE Main shifts held from 2017 to 2026.