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प्रश्न
Which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why?
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उत्तर
- Copper (Cu) in the first series of transition metals most frequently exhibits the +1 oxidation state.
- This occurs because Cu has the electronic configuration [Ar] 3d10 4s1.
- When Cu forms the +1 ion (Cu+), it achieves a completely filled and very stable 3d10 configuration.
- The extra stability of the filled d-subshell makes the +1 oxidation state common for copper compared to other first transition metals.
संबंधित प्रश्न
Which is a stronger reducing agent, Cr2+ or Fe2+ and why?
For M2+/M and M3+/M2+ systems, the E° values for some metals are as follows:
| Cr2+/Cr | −0.9 V |
| Mn2+/Mn | −1.2 V |
| Fe2+/Fe | −0.4 V |
| Cr3/Cr2+ | −0.4 V |
| Mn3+/Mn2+ | +1.5 V |
| Fe3+/Fe2+ | +0.8 V |
Use this data to comment upon:
- The stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+ and
- the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.
Compare the stability of +2 oxidation state for the elements of the first transition series.
Calculate the number of unpaired electrons in the following gaseous ions:
Mn3+, Cr3+, V3+ and Ti3+. Which one of these is the most stable in an aqueous solution?
Why do transition metal ions possess a great tendency to form complexes?
How is potassium dichromate prepared from chrome iron ore?
Account for the following :
Ti4+ is colourless whereas V4+ is coloured in an aqueous solutions.
Two metallic elements A and B have the following standard oxidation potentials: A = 0·40v B = - 0·80v. What would you expect if element A was added to an aqueous salt solution of element B? Give a reason for your answer.
Explain why Mn2+ is more stable than Fe2+ towards oxidation to +3 state. (At. no. of Mn = 25, Fe = 26)
When \[\ce{KMnO4}\] solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because ______.
Which of the following is non-metallic?
The standard electrode potentials of four elements A, B, C and D are – 3.05, – 1.66, – 0.40 and + 0.80. The highest chemical reactivity will be exhibited by
The spin magnetic moment of cobalt in the compound Hg [Co(SCN)4] is:-
Photographic film and plates have - au essential ingredient of
Which of the following transition metal is not coloured?
Which of the following ions acts as a typical transition metal ion?
In the ground state of atomic Fe (Z = 26), the spin-only magnetic moment is ______ × 10-1 BM.
(Round off to the nearest integer).
[Given: `sqrt3 = 1.73, sqrt2 = 1.41`]
Write the number of unpaired electrons in Cr3+.
(Atomic number of Cr = 24)
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
The E° value for the Mn2+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due to the change of:
