Give reasons :(a) Eo value for Mn3+/Mn2+ couple is much more positive

1.	Give reasons :(a) Eo value for Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+. (b) Iron has higher enthalpy of atomization than that of copper. (c) Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.
Answer» (a) Because Mn²⁺ is more stable than Mn³⁺ due to half-filled d⁵ configuration whereas Fe²⁺ becomes unstable after loosing an electron from half filled orbital. (b) Due to presence of higher number of unpaired electrons in iron, they have stronger covalent bonding. Hence, the enthalpy of atomization is more of iron than that of copper. (c) Sc³⁺ is colourless as it does not contain unpaired electrons to undergo d-d transition while Ti³⁺ is coloured as it contains unpaired electrons to undergo d-d transition by absorbing light from visible region and radiate complementary colour.

Give reasons :(a) Eo value for Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+. (b) Iron has higher enthalpy of atomization than that of copper. (c) Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.

Answer»

(a) Because Mn²⁺ is more stable than Mn³⁺ due to half-filled d⁵ configuration whereas Fe²⁺ becomes unstable after loosing an electron from half filled orbital.

(b) Due to presence of higher number of unpaired electrons in iron, they have stronger covalent bonding. Hence, the enthalpy of atomization is more of iron than that of copper.

(c) Sc³⁺ is colourless as it does not contain unpaired electrons to undergo d-d transition while Ti³⁺ is coloured as it contains unpaired electrons to undergo d-d transition by absorbing light from visible region and radiate complementary colour.

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