The correct order of number of unpaired electrons is

Question

The correct order of number of unpaired electrons is (A) Cu2+ > Ni2+ > Cr3+ > Fe3+ (B) Ni2+ > Cu2+ > Fe3+ > Cr3+ (C) Fe3+ > Cr3+ >Ni2+ > Cu2+ (D) Cr3+ > Fe3+ >Ni2+ > Cu2+

Tardigrade Admin · Accepted Answer

Fe3+ - 3d5 No. of unpaired electrons = 5 Cr3+ - 3d3 No. of unpaired electrons = 3 Ni2+ - 3d8 No. of unpaired electrons = 2 Cu2+ - 3d9 No. of unpaired electrons = 1

Q. The correct order of number of unpaired electrons is

$C u^{2 +} > N i^{2 +} > C r^{3 +} > F e^{3 +}$

$N i^{2 +} > C u^{2 +} > F e^{3 +} > C r^{3 +}$

$F e^{3 +} > C r^{3 +} > N i^{2 +} > C u^{2 +}$

$C r^{3 +} > F e^{3 +} > N i^{2 +} > C u^{2 +}$

$F e^{3 +} - 3 d^{5}$ No. of unpaired electrons $= 5$
$C r^{3 +} - 3 d^{3}$ No. of unpaired electrons $= 3$
$N i^{2 +} - 3 d^{8}$ No. of unpaired electrons $= 2$
$C u^{2 +} - 3 d^{9}$ No. of unpaired electrons $= 1$

Q. The correct order of number of unpaired electrons is

Cu2+>Ni2+>Cr3+>Fe3+

Ni2+>Cu2+>Fe3+>Cr3+

Fe3+>Cr3+>Ni2+>Cu2+

Cr3+>Fe3+>Ni2+>Cu2+

Fe3+−3d5 No. of unpaired electrons =5 Cr3+−3d3 No. of unpaired electrons =3 Ni2+−3d8 No. of unpaired electrons =2 Cu2+−3d9 No. of unpaired electrons =1

$C u^{2 +} > N i^{2 +} > C r^{3 +} > F e^{3 +}$

$N i^{2 +} > C u^{2 +} > F e^{3 +} > C r^{3 +}$

$F e^{3 +} > C r^{3 +} > N i^{2 +} > C u^{2 +}$

$C r^{3 +} > F e^{3 +} > N i^{2 +} > C u^{2 +}$

$F e^{3 +} - 3 d^{5}$ No. of unpaired electrons $= 5$
$C r^{3 +} - 3 d^{3}$ No. of unpaired electrons $= 3$
$N i^{2 +} - 3 d^{8}$ No. of unpaired electrons $= 2$
$C u^{2 +} - 3 d^{9}$ No. of unpaired electrons $= 1$