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JEE Main 202122 JulyMorning Shift
Exam
JEE Main
Year
2021
Date
22 July
Shift
Morning Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2021 · 22 July · Morning Shift · Chemistry · d and f Block Elements

The set having ions which are coloured and paramagnetic both is -

The set having ions which are coloured and paramagnetic both is -

Options

  1. ACu2+,Cr3+,Sc+{Cu}^{2 +}, {Cr}^{3 +}, {Sc}^{+}
  2. BCu2+,Zn2+,Mn4+{Cu}^{2 +}, {Zn}^{2 +}, {Mn}^{4 +}
  3. CSc3+,V5+,Ti4+{Sc}^{3 +}, {V}^{5 +}, {Ti}^{4 +}
  4. DNi2+,Mn7+,Hg2+{Ni}^{2 +}, {Mn}^{7 +}, {Hg}^{2 +}

Correct answer

A. Cu2+,Cr3+,Sc+{Cu}^{2 +}, {Cr}^{3 +}, {Sc}^{+}

Step-by-step solution

Cu2+:[Ar]3d94s0{Cu}^{2 +}: [ Ar ] 3{d}^{9}4{s}^{0}
Cr3+:[Ar]3d34s0{Cr}^{3 +}: [ Ar ] 3{d}^{3}4{s}^{0}
Sc+:[Ar]3d14s1{Sc}^{+}: [ Ar ] 3{d}^{1}4{s}^{1}

All are coloured and paramagnetic due to presence of unpaired electrons.

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