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in Chemistry by (65.8k points)

Decide giving reason which one of the following pairs exhibit the property indicated:

 (i) Sc3+ or Cr3+ exhibits paramagnetism

(ii) V or Mn exhibits more number of oxidation states

(iii) V4+ or V5+ exhibits colour

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(i) Sc = [Ar] 3d14s2;   Sc3+ = [Ar] ; it has no unpaired electron so diamagnetic

Cr = [Ar] 3d54s1; Cr3+ = [Ar]3d3;  it has three unpaired electrons paramagnetic

(ii) V =  [Ar] 3d34s2;   Mn = [Ar]3d54s2 Thus V exhibit oxidation states of +2, +3, +4, +5  whereas Mn exhibit oxidation states of +2 to +7.

(iii) V4+ = [Ar] 3d1 → coloured    V5+ = [Ar] → Colourless

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