1.

Give reasons for the following: (i) Transition metals for large number of complex compounds (ii) Iron has higher enthalpy of atomisation that of copper (iii) Mn2+ compounds are more stable than Fe2+ compounds towards oxidation to +3 state

Answer»

(I) Transition metals form a large number of compounds due to: 

(a) Comparatively small size 

(b) High ionic charges 

(c) Availability of d-orbitals 

(ii) Iron has great number of unpaired electrons than copper, hence higher the enthalpy of atomisation. 

(iii) The electronic configuration of Mn2+ is 3d5 which is stable. In Fe2+ the configuration is 3d6 , it can lose an electron easily to give stable 3d5 configuration.



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