JEE Main 2024 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 8 April 2024, Shift 1, Chemistry Q70

Question 70 of 90 in this shift, Chemistry question 10 of 30, Section A.

An octahedral complex with the formula

\mathrm{CoCl_3\cdot nNH_3}

upon reaction with excess of

\mathrm{AgNO_3}

solution gives 2 moles of AgCl. Consider the oxidation state of Co in the complex is 'x'. The value of "x + n" is ____________.

(1) $3$
(2) $6$
(3) $5$
(4) $8$ Official answer

Official answer

Option 4

NTA final key.

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

Same idea in other shifts

Asked 7× in all

29 Jul 2022, Shift 2 · Q86Sum of oxidation state (magnitude) and coordination number of cobalt in $\mathrm{Na[Co(bpy)Cl_4]}$ is ____. (Given: bpy = [figure:…EasyNumerical valueHas a figure
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
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

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.