Many transition metals are paramagnetic. Why?

Distinguish between paramagnetism and ferro-magnetism. How does ferro magnetism arise?

What are actinoids? Mention two characteristics of actinoids.

(i) Breifly explain the physical properties of lanthanoids.
(ii)  The chemical reactivity of lanthanoids resembles to which other elements of the periodic table.

How does the acidified KMnO₄ react with the following:
(a) Iron(II) solution, (b)SO₃^2–, (c) Iodide (I^–) ion, (d) oxalic acid, (e) NO₂^– (Nitrite ion).

316.

Explain the oxidising property of KMnO₄ in neutral medium with example.

Explain any one of following statement:
(i) The transition metals are well known for the formation of interstitial compounds.
(ii) The largest number of oxidation states are exhibited by mangnese in the first series of transition elements.

Answer the following questions:
(i) Which element in the first series of transition elements does not exhibit variable oxidation states and why?
(ii) Why do actinoids in general exhibit a greater range of oxidation states than the Lanthanoids?

i)Describe how potassium permanganate is made from pyrolusite. Write the chemical equations for the involved reactions. 
ii) Describe with an example each of the oxidising actions of permanganate ion in alkaline and acidic media. What acid and alkali are usually used?

Describe how potassium dichromate is made from chromate ore and give the equations for the chemical reactions involved.
Write balanced ionic equations for reacting ions to represent the action of acidified potassium dichromate solution on:
(a)    Potassium iodide solution.
(b)    Acidified ferrous sulphate solution. Write two uses of potassium dichromate.