Question

Assign giving suitable reason which of the following pairs exhibits the property indicated against each.

(i) Sc³⁺ or Cr³⁺ exhibits Para magnetism

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

(iii) V⁴⁺ or  V⁵⁺ exhibits colour

Answer 1

(i) Cr³⁺has three unpaired electron in 3d – sub shell hence it is paramagnetic.

(ii) Mn exhibits more no. of oxidation states as it has five unpaired electrons in (n-1)d and two electrons in ns orbital take part in bonding.

(iii) V⁴⁺ is coloured as it has 3d¹ configuration while V⁵⁺ has 3d⁰ configuration, hence electrons on V⁴⁺ undergoes d-d transition.