Advertisements
Advertisements
Questions
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.
Solution 1
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.
Solution 2
The transition elements form complexes because of the following reasons:
- Comparitively smaller size of their metal ions.
- Their high ionic charges.
- Availability of vacant d-orbitals so that these orbitals can accept lonepairs of electrons donated by the ligands.
APPEARS IN
RELATED QUESTIONS
Account for the following:
Cu+2 salts are coloured, while Zn2+ salts are white.
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?
Give reasons: Transition metals show variable oxidation states.
Account for the following :
Zn is not considered as a transition element.
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iodide.
What is meant by 'disproportionation'? Give two examples of disproportionation reaction in aqueous solution.
What are inner transition elements?
Write down the number of 3d electrons in the following ion:
Cu2+
Indicate how would you expect the five 3d orbitals to be occupied for this hydrated ions (octahedral).
Match the catalysts given in Column I with the processes given in Column II.
| Column I (Catalyst) | Column II (Process) |
| (i) \[\ce{Ni}\] in the presence of hydrogen | (a) Zieglar Natta catalyst |
| (ii) \[\ce{Cu2C12}\] | (b) Contact process |
| (iii) \[\ce{V2O5}\] | (c) Vegetable oil to ghee |
| (iv) Finely divided iron | (d) Sandmeyer reaction |
| (v) \[\ce{TiCl4 + Al (CH3)3}\] | (e) Haber's Process |
| (f) Decomposition of KCIO3 |
Consider the following standard electrode potentials (E° in volts) in aqueous solution:
| Element | M3+/M | M+/M |
| Al | - 1.66 | +0.55 |
| Tl | + 1.26 | -0.34 |
Based on these data, which of the following statements is correct?
