(i) Describe the steps involved in the preparation of : (a) K 2 Cr2O 7 from Na 2 CrO 4 . (b) KMnO 4 from K 2 MnO 4 . (ii) Assign a possible chemical equations (a) La 3+ and Lu 3+ do not show any colour. (b) The third ionisation enthalpy of La is very low (La 57)
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