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Q 2666778675.     (a) Write the steps involved in the preparation of
(i) `K_2 Cr_2 O_7` from `Na_2CrO_4`
(ii)` KMnO_4` from `K_2MnO_4`
(iii) Calomel from corrosive sublimate
(b) What is meant by lanthanoid contraction? What effect does it have on the chemistry of the elements which follow lanthanoids?
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)