Question

If molten magnesium bromide (MgBr) is split by electrolysis, which of the following reactions occurs at the anode?

Question 1 options:

2Br2 (g) --> 2Br (l) + 2e-


2Mg+ (l) --> 2Mg+ (l) + 2e-


2Br- (l) --> Br2 (g) + 2e-


2Mg+ (l) + 2e- --> 2Mg (l)

Answer 1

C. Oxidation occurs at the anode!

Answer 2

Answer : The correct option is,
`Br_2+2e^-\rightarrow 2Br^-`

Explanation :

Electrolytic cell : It is defined as the cell in which the chemical reaction occurs by passing of the current from external source.

In this electrolytic cell, the oxidation occurs at anode which is a positive electrode and reduction occurs at cathode which is a negative electrode.

For example : On passing electricity in the molten
`MgBr_2`.

The two half-reaction equation are :

Reduction :
`Mg\rightarrow Mg^(2+)+2e^-` (cathode)

Oxidation :
`Br_2+2e^-\rightarrow 2Br^-` (anode)

The balanced chemical reaction will be,

`MgBr_2\rightarrow Mg^(2+)+2Br^-`

Hence, the correct option is,
`Br_2+2e^-\rightarrow 2Br^-`