EVERYDAY SCIENCE

Detailed explanation-1: -In the electrolysis of molten copper chloride, the substance liberated at the anode is chlorine and the substance deposited at cathode is copper. So, the correct answer is “Option B”.

Detailed explanation-2: -Copper chloride solution (CuCl2(aq)) contains chloride ions (Cl-(aq)). These can be oxidised to chlorine molecules (Cl2). This is seen by bubbles of chlorine gas forming at the positively charged electrode.

Detailed explanation-3: -At the positive electrode (anode), oxygen is produced unless the solution contains halide ions when the halogen is produced. This happens because in the aqueous solution water molecules break down producing hydrogen ions and hydroxide ions that are discharged.

Detailed explanation-4: -Cl-ions that collide with the positive electrode are oxidized to Cl2 gas, which bubbles off at this electrode. The net effect of passing an electric current through the molten salt in this cell is to decompose sodium chloride into its elements, sodium metal and chlorine gas.

Detailed explanation-5: -Electrolysis of CuCl : The negative (chloride) ions go to the Positive electrode, lose electrons and form Chlorine gas. The positive (copper) ions go to the Negative electrode, gain electrons and form Copper. Copper is formed at the negative electrode and Chlorine gas is formed at the positive electrode.