i) Mn Shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4.
ii) Cr²⁺ is a strong reducing agent.
iii) Cu²⁺ salts are coloured while Zn²⁺ salts are white.

b) Complete the following equations:

i) Mn Shows the highest oxidation state of +7 with oxygen but with fluorine, it shows the highest oxidation state of +4 because of the ability of oxygen to form multiple bonds with Mn metal.

ii) Cr²⁺ is strongly reducing in nature. It has a d⁴ configuration. Cr²⁺ is a stronger reducing agent because it can lose one of its electrons to become Cr³⁺ in which the t2g level of d-orbital is half filled and the eg level is empty.which is a more stable configuration.

iii) The electronic configuration of Zn = 3d¹⁰ 4s²
Zn²⁺ = 3d¹⁰
where as the electronic configuration of Cu = 3d¹⁰ 4s¹

Cu²⁺ =3d⁹
In the case of Zn fully filled d orbital is present therefore no d-d transition can be possible in this case and it is colourless.
In the case of copper 3d⁹ because of d-d transition electrons emits light in the visible range and hence they are coloured compounds.