Advertisements
Advertisements
प्रश्न
How would you account for the following:
The d1 configuration is very unstable in ions.
Advertisements
उत्तर
In ions, the d1 configuration is unstable, but after losing one electron, it becomes more stable due to the vacant d-orbitals. All elements with d1 configuration are reduced or undergo disproportionation. e.g.,
\[\ce{3\overset{+6}{\underset{3d^1}{Mn}}O^2-_4 + 4H+ -> 2\overset{+7}{\underset{3d^0}{Mn}}O^-_4 + \overset{+4}{Mn}O2 + 2H2O}\]
APPEARS IN
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 +2 oxidation state of manganese is more stable?
Account for the following:
Cr2+ is a strong reducing agent.
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element shows only +3 oxidation state?
Why do the transition elements have higher enthalpies of atomisation?
To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? Illustrate your answer with examples.
What may be the stable oxidation state of the transition element with the following d electron configurations in the ground state of its atom?
3d3
NF3 is possible, but NF5 is not. Why?
Why do transition metal ions possess a great tendency to form complexes?
How is potassium dichromate prepared from chrome iron ore?
Transition metals with highest melting point is ____________.
Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why?
Answer the following question:
Which element of the first transition series has highest second ionisation enthalpy?
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 spin magnetic moment of cobalt in the compound Hg [Co(SCN)4] is:-
Which does not belong to first transition series?
Which of the following ions has the maximum magnetic moment?
The electrode potential of M2+/M of 3d-series elements shows the positive value for ______.
Which property of transition metals enables them to behave as catalysts?
The given graph shows the trends in melting points of transition metals:
Explain the reason why Cr has the highest melting point and manganese (Mn) has a lower melting point.
