The Faraday constant is $......$

During the electrolysis of molten sodium chloride,the time required to produce $0.10 \ mol$ of chlorine gas using a current of $3 \ A$ is .......... $\min.$

How many atoms of calcium will be deposited from molten $CaCl_2$ by a current of $25 \, mA$ flowing for $60 \, s$?

If $96500 \ C$ of electricity liberates one gram equivalent of any substance,the time taken for a current of $0.15 \ A$ to deposit $20 \ mg$ of copper from a solution of copper sulphate is (Chemical equivalent of copper = $32$).

The amount of $Ag$ (atomic mass $= 108$) deposited at the cathode when a current of $0.5 \, A$ is passed through a solution of $AgNO_3$ for $1 \, h$ is closest to $... \, g$.

Cells $A$ and $B$ contain aqueous solutions of ferrous chloride $(FeCl_2)$ and ferric chloride $(FeCl_3)$ respectively. If the same quantity of electricity is passed through both cells, what is the ratio of the mass of iron deposited in cell $A$ to that in cell $B$?