Molten `NaCl` is electrolyzed in a cell called

Options

A. Downs cell
B. Castner cell
C. Kellner cell
D. Hall cell

Answer

a., b,c., d.

Explanation

In a Downs cell, molten `NaCl` is electrolyzed to give `Na` at cathode and `Cl_(2)(g)` at anode.
`b,c.,` A Castner Kellner cell is used for the preparation of caustic soda `(NaOH)`.
`NaOH` is prepared by the electrolysis of a saturated solution of `NaCl` using `Hg` as cathode and carbon rods as anode.
`d.` In a Hall cell `(` or Hall `-` Heroult cell `)`, aluminium `(Al)` is obtained from the electrolysis of molten `Al_(2)O_(3)(` alumina `)+` cryolite `(Na_(3)AlF_(6))+CaF_(2)+AlF_(3)`.