How many Faraday of electricity is required to deposit $$0.8 \mathrm{~g}$$ of calcium at cathode by the electrolysis of $$\mathrm{CaCl}_2$$ ?

(Molar mass of $$\mathrm{Ca}=40 \mathrm{~g} \mathrm{~mol}^{-1}$$)

Identify lowest positive charge developed (indicated by $$\partial, \partial_1, \partial_2, \partial_3$$) due to inductive effect in following compounds.

$$\mathrm{C{H_3} - \mathop {C{H_2}}\limits^{{\delta _3}} \to \mathop {C{H_2}}\limits^{{\delta _2}} \to \mathop {C{H_2}}\limits^{{\delta _1}} \to \mathop {Cl}\limits^{{\delta _{}}}}$$

What is rate constant of a first order reaction if 0.08 mole of reactant reduces to 0.02 mole in 23.03 minute?

Which element from following lanthanoids has half-filled $$\mathrm{f}$$- orbital in observed and expected electronic configuration?