Attempt any five of the following: (a) Which of the following ions will have a magnetic moment value of 1.73 BM. Sc3+, Ti3+, Ti2+, Cu2+, Zn2+ (b) In order to protect iron from corrosion, which one will you prefer as a sacrificial electrode, Ni or Zn? Why? (Given standard electrode potentials of Ni, Fe and Zn are -0.25 V, -0.44 V and -0.76 V respectively.) (c) The second ionization enthalpies of chromium and manganese are 1592 and 1509 kJ/mol respectively. Explain the lower value of Mn. (d) Give two similarities in the properties of Sc and Zn. (e) What is actinoid contraction? What causes actinoid contraction? (f) What is the oxidation state of chromium in chromate ion and dichromate ion? (g) Write the ionic equation for reaction of KI with acidified KMnO 4.
