(a) How does permanganate solution react with Fe(II) ions? Write balanced ionic equations for the reaction.
(b) Why do transition metals and many of their compounds act as good catalysts?

Explain why transition metals and their many compounds act as good catalyst.

Explain why transition metals and their many compounds act as goodd catalyst.

How would you account for the fact that the transition metals and their compounds are found to be good catalysts in many processes?

Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with oxalic acid? Write the ionic equation for the reaction. OR Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with (i) an iodide (ii) H_(2)S .

Assign reasons for the following : (i) The enthalpies of atomisation of transition elements are high. (ii) The transition metals and many of their compounds act as good catalyst. (iii) From element to element the actinoid contraction is greater than the lanthanoid contraction. (iv) The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) . (v) Scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as transition element.

(a) What is Lanthanoid contraction? Give the cause of lanthanoid contraction. (b) Why do transition metals form many coloured ions?

(a) Members of second and third transition series exhibit similar atomic radii. Explain. (b) Account for the following: (i) Transition metals and their many compounds act as good catalysts. (ii) Actinoids has greater tendency to form complexes in comparison to Lanthanoids.

When you mix solutions of lead (II) nitrate and potassium iodide, Write a balanced chemical equation for the reaction.