CBSE - Class 12 Chemistry The d- and f-Block Elements Worksheet
1.
Explain giving reasons: (iii) The transition metals generally form coloured compounds.
2.
Compare the stability of +2 oxidation state for the elements of the first transition series.
3.
Compare the chemistry of the actinoids with that of lanthanoids with reference to: (ii) oxidation states
4.
What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.
5.
Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.
6.
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with: (iii) \(H_{2}S\)
7.
What may be the stable oxidation state of the transition element with the following d electron configurations in the ground state of their atoms : \(3d^{3}\), \(3d^{5}\), \(3d^{8}\) and \(3d^{4}\)?
8.
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with: (ii) iron(II) solution
9.
How would you account for the following: (ii) Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.
10.
Compare the chemistry of actinoids with that of the lanthanoids with special reference to: (iv) chemical reactivity.
11.
Compare the chemistry of the actinoids with that of lanthanoids with reference to: (i) electronic configuration
12.
Write down the electronic configuration of: (i) \(Cr^{3+}\)
13.
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 points: (iv) atomic sizes.
14.
Why are \(Mn^{2+}\) compounds more stable than \(Fe^{2+}\) towards oxidation to their +3 state?
15.
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with: (i) iodide
16.
How would you account for the following: (i) Of the \(d^{4}\) species, \(Cr^{2+}\) is strongly reducing while manganese(III) is strongly oxidising.
17.
The chemistry of the actinoid elements is not so smooth as that of the lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements.
18.
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 points: (iii) ionisation enthalpies
19.
Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?
20.
Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element.
