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प्रश्न
Why +2 oxidation state of manganese is more stable?
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उत्तर
- Manganese, having five unpaired electrons, exhibits six different oxidation states. The small energy difference between the 3d and 4s orbitals allows manganese to lose electrons from both, resulting in oxidation states ranging from +2 to +7.
- Electronic configuration of Mn2+ = [Ar]3d54s0
- Half-filled (d5) d-orbitals provide the Mn2+ ion additional stability, making Mn in the +2 oxidation state more stable.
संबंधित प्रश्न
Give reasons:
Transition metals show variable oxidation states.
|
`E_((M^(2+)/M)` |
Cr | Mn | Fe | Co | Ni | Cu |
| -0.91 | -1.18 | -0.44 | -0.28 | -0.25 | -0.34 |
From the given data of E0 values, answer the following questions :
(1) Why is `E_(((Cu^(2+))/(Cu)))` value exceptionally positive
(2) Why is `E_(((Mn^(2+))/(Mn)))` value is highly negative as compared to other elements
(3) Which is the stronger reducing agents Cr2+ or Fe2+ ? Give Reason.
Out of Mn3+ and Cr3+, which is more paramagnetic and why ?
(Atomic nos. : Mn = 25, Cr = 24)
In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomization of zinc is the lowest, i.e., 126 kJ mol−1. Why?
How would you account for the irregular variation of ionization enthalpies (first and second) in the first series of the transition elements?
What are the characteristics of the transition elements and why are they called 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:
Electronic configurations
Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number
Account for the following :
Ti4+ is colourless whereas V4+ is coloured in an aqueous solutions.
Which is the most stable oxidation state of iron?
Transition elements show high melting points. Why?
On the basis of the figure given below, answer the following questions:
- Why Manganese has lower melting point than Chromium?
- Why do transition metals of 3d series have lower melting points as compared to 4d series?
- In the third transition series, identify and name the metal with the highest melting point.
The orientation of an atomic orbital is governed by
The product of oxidation of I– with \[\ce{MnO^{-}4}\] in alkaline medium is:-
The basic character of transition metals monoxide follow the order.
Which of the following transition metal is not coloured?
Why are all copper halides known except that copper iodide?
Give reasons for the following statement:
Transition metals and most of their compounds show paramagnetic behaviour.
Give reasons for the following statement:
Zn, Cd, and Hg are soft metals.
The electrode potential of M2+/M of 3d-series elements shows the positive value for ______.
Assertion (A): Transition metals have high enthalpy of atomisation.
Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.
Complete the following reaction and justify that it is a disproportionation reaction:
\[\ce{3MnO^{2-}4 + 4H^+ -> \underline{}\underline{}\underline{}\underline{} + \underline{}\underline{}\underline{}\underline{} + 2H2O}\]
Which of the following ions has the electronic configuration 3d6?
(Atomic number: Mn = 25, Co = 27, Ni = 28)
Account for the following:
Copper has an exceptionally positive `"E"_("M"^(2+)//"M")^0` value.
Give two similarities in the properties of Sc and Zn.
Give a reason for the following.
Some transition metals and their compounds get attracted towards the magnetic field.
