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प्रश्न
How would you account for the following: Transition metals form complex compounds.
Account for the following:
Transition metals form a large number of complexes.
Account for the following:
Transition metals form large number of complex compounds.
Give reasons for the following:
Transition elements form complex compounds.
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उत्तर १
The transition elements form complexes because they are able to accept pairs of electrons from donor molecules or ions to form dative covalent bonds. This happens because they have vacant orbitals of suitable energy which can accept the non-bonding pairs from the ligands.
उत्तर २
The transition elements form complexes because of the following reasons:
- Comparatively smaller size of their metal ions.
- Their high ionic charges.
- Availability of vacant d-orbitals so that these orbitals can accept lone pairs of electrons donated by the ligands.
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संबंधित प्रश्न
Account for the following:
Cu+2 salts are coloured, while Zn2+ salts are white.
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 factors which are related to the colour of transition metal ions.
Which one of the following ions is coloured?
NF3 is possible, but NF5 is not. Why?
Explain why does colour of KMnO4 disappear when oxalic acid is added to its solution in acidic medium.
Reactivity of transition elements decreases almost regularly from Sc to Cu. Explain.
Which of the following ions acts as a typical transition metal ion?
The second ionization enthalpies of chromium and manganese are 1592 and 1509 kJ/mol respectively. Explain the lower value of Mn.
For M2+/M and M3+/M2+systems, the EΘ 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 ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.
