Question

A compound which liberates reddish brown gas around the anode during electrolysis in its molten state is -

• A. Sodium chloride
• B. Copper (II) oxide
• C. Lead (II) bromide
• D. Copper (II) sulphate

Answer 1

Answer: (C)

We know that Bromine gas is reddish brown in colour and which can only liberates during electrolysis of Lead (II) bromide $\left(PbB{r}_2\right)$

During electrolysis of Lead (II) bromide , Positive lead ions (cations) move to the cathode and gain electrons to become lead metal and . negative bromide ions (anions) move to the anode and loose an electron to make chlorine atoms. Two bromine atoms then combine and the diatomic bromine gas $\left(B{r}_2\right)$ is released at the anode.

Therefore, D is correct option.