Explain why:(i) Mn2+ is more stable than Fe2+ towards oxidation to +3

1.	Explain why:(i) Mn2+ is more stable than Fe2+ towards oxidation to +3 state. (At. no. of Mn = 25, Fe = 26)(ii) Transition elements usually form coloured ions. (iii) Zr and Hf exhibit similar properties. (At. no. of Zr = 40, Hf = 72)
Answer» (i) This is because Mn²⁺(3d⁵ ) has extra stable electronic configuration but Fe²⁺(3d⁶ ) does not. (ii) This is due to the presence of impaired electrons in their (n-1) d – orbitals. (iii) This is due to lanthanide contraction or ineffective shielding but intervening 4felectrons in Hf.

Explain why:(i) Mn2+ is more stable than Fe2+ towards oxidation to +3 state. (At. no. of Mn = 25, Fe = 26)(ii) Transition elements usually form coloured ions. (iii) Zr and Hf exhibit similar properties. (At. no. of Zr = 40, Hf = 72)

Answer»

(i) This is because Mn²⁺(3d⁵ ) has extra stable electronic configuration but Fe²⁺(3d⁶ ) does not.

(ii) This is due to the presence of impaired electrons in their (n-1) d – orbitals.

(iii) This is due to lanthanide contraction or ineffective shielding but intervening 4felectrons in Hf.