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प्रश्न
Account for the following:
E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+.
उत्तर १
In case of Mn '+2' oxidation state is more stable than '+3' oxidation state and in case of Cr '+3' oxidation state is more stable than '+2' oxidation state.
उत्तर २
The E° value for the Mn3+/Mn2+ couple is much more positive than that for the Cr3+/Cr2+ couple. This is because the Mn2+ ion is particularly stable due to the extra stability of its half-filled valence electronic configuration (3d5). Thus Mn3+ ion has a very high tendency to gain an electron and form the much more stable Mn2+ ion.
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संबंधित प्रश्न
Which of the following cations are coloured in aqueous solutions and why ?
Sc3+, V3+, Ti4+, Mn2+ (At. Nos. Sc = 21, V = 23, Ti = 22, Mn = 25)
Why do the transition elements have higher enthalpies of atomisation?
Why are Mn2+ compounds more stable than Fe2+ towards oxidation to their +3 state?
In what way is the electronic configuration of the transition elements different from that of the non-transition elements?
Following are the transition metal ions of 3d series:
Ti4+, V2+, Mn3+, Cr3+
(Atomic numbers: Ti = 22, V = 23, Mn = 25, Cr = 24)
Answer the following:
1) Which ion is most stable in an aqueous solution and why?
2) Which ion is a strong oxidising agent and why?
3) Which ion is colourless and why?
Although fluorine is more electronegative than oxygen, but the ability of oxygen to stabilise higher oxidation states exceeds that of fluorine. Why?
Account for the following:
In case of transition elements, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number.
Assertion (A): Transition metals have high enthalpy of atomisation.
Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.
Which of the following ions has the electronic configuration 3d6?
(Atomic number: Mn = 25, Co = 27, Ni = 28)
Give two similarities in the properties of Sc and Zn.
