a) Halides of B and Al are Lewis acids. Comment upon it. b) CACO3 decomposes on heating but Na,CO3 does not. Give reason. c) Transition metals are less reactive than alkali and alkaline earth metals. Give reason. d) Among Co*2 and Co*3 which should be a better oxidizing agent? Why? e) Why Sc+3 is more stable than Sc+2? f) Why the second ionization energy for Cu and Cr are higher than expectation? g) Cupric salts are blue in colour while cuprous salts are colourless. Give reason? h) Calculate the spin magnetic moment for Fe*3 i) Lanthanides have poor tendency to form complex. Why?