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प्रश्न
Why are Mn2+ compounds more stable than Fe2+ towards oxidation to their +3 state?
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उत्तर
- The electronic configuration of Mn2+ is [Ar] 3d5 while that of Fe2+ is [Ar] 3d6.
- Since Mn2+ has a half-filled orbit (3d5), it is not easily oxidised to Mn3+ because of its very high third ionization enthalpy.
- In contrast, Fe2+ compounds are easily oxidised to Fe3+ due to a lower third ionization enthalpy, which results in the more stable half-filled 3d5 configuration.
- This is the reason why Mn2+ compounds are more stable than Fe2+ towards oxidation to their +3 state.
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संबंधित प्रश्न
Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?
ln which pair highest oxidation states of transition metals are found:
What are the transition elements? Write two characteristics of the transition elements.
Account for the following:
E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+.
Out of Mn3+ and Cr3+, which is more paramagnetic and why ?
(Atomic nos. : Mn = 25, Cr = 24)
How would you account for the following:
The d1 configuration is very unstable in ions.
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?
Electronic configuration of Mn2+ is ____________.
Transition elements form binary compounds with halogens. Which of the following elements will form \[\ce{MF3}\] type compounds?
(i) \[\ce{Cr}\]
(ii) \[\ce{Co}\]
(iii) \[\ce{Cu}\]
(iv) \[\ce{Ni}\]
Which of the following will not act as oxidising agents?
(i) \[\ce{CrO3}\]
(ii) \[\ce{MoO3}\]
(iii) \[\ce{WO3}\]
(iv) \[\ce{CrO^{2-}4}\]
While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why?
Which of the following ions has the maximum magnetic moment?
Match List - I with List - II.
| List - I | List - II | ||
| (A) | [Fe(CN)6]3− | (i) | 5.92 BM |
| (B) | [Fe(H2O)6]3+ | (ii) | 0 BM |
| (C) | [Fe(CN)6]4− | (iii) | 4.90 BM |
| (D) | [Fe(H2O)6]2+ | (iv) | 1.73 BM |
Choose the correct answer from the options given below.
Which of the following transition metals shows +1 and +2 oxidation states?
Which property of transition metals enables them to behave as catalysts?
A transition element X has an electronic configuration [Ar]4s23d3. Predict its likely oxidation states.
Explain the use of different transition metals as catalysts.
Give a reason for the following:
Zinc, cadmium and mercury are considered as d-block elements but not regarded as transition elements.
Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:
Oxidation states
