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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3df080

Select the correct statements about the following aqueous ions (spin-only values).

A $Sc X^{3 +}$ is colourless and diamagnetic
B $Ti X^{3 +}$ is coloured with $μ \approx 1.73$ BM
C $Zn X^{2 +}$ is colourless and diamagnetic
D $Mn X^{2 +}$ has $μ \approx 4.9$ BM

Answer: A, B, C

Sc X^{3 +}

(

d^{0}

) and

Zn X^{2 +}

(

d^{10}

) have no

d

-

d

transitions and no unpaired electrons, so both are colourless and diamagnetic.

Ti X^{3 +}

is

d^{1}

: one unpaired electron,

μ = 1.73

BM, and it is coloured.

Mn X^{2 +}

is

d^{5}

with 5 unpaired electrons,

μ = 5.92

BM, not 4.9, so (d) is wrong.

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