Calculate the emf of the following cell at 25⁰C

(a) How would you account for the following?

(i) Actinoid contraction is greater than Lanthanoid contraction.

(ii) Transition metals form coloured compounds.

(b) Complete the following equation:

(i) Draw the geometrical isomers of complex [Pt(NH₃)₂Cl₂]

(ii) On the basis of crystal field theory, write the electronic configuration for d⁴ ion if .

(iii) Write the hybridization and magnetic behaviour of the complex [Ni(CO)₄].

(Atomic no of Ni = 28)

Give reasons for following observations:

(i) Leather gets hardened after tanning.

(ii) Lyophilic sol is more stable than lyophobic sol.

(iii) It is necessary to remove CO when ammonia is prepared by Haber’s process.

Write the names and structures of the monomers of the following polymers: