Consider the following metallurgical processes :
(1) Heating impure metal with `CO` and distilling the resulting volatile carbonyl `(BP 43^@ C)` and finally decomposing at `150^@C` to `230^@ C` to get pure metal.
(2) Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged sulphide.
(3) Electrolysing the molten electrolyte containing `CaCl_(2)` to obtain the metal
The processes used for obtaining sodium, nickel, and copper are, respectively

Options

A. `(3)/(2)`
B. `(2)/(3)`
C. 1
D. None of these

Answer

2

Explanation

`Q_(c)=([p_(2)(g)]^(4))/([P_(4)(g)])=((1)^(2))/((3//2))=(2)/(3)`