Question

Small amount of a mineral salt present naturally in water makes it a . . . . . of electricity.

• A. Insulator
• B. good conductor
• C. good semiconductor
• D. No effect

Answer 1

The correct option is B good conductor

Electroplating is a process that uses electric current to reduce dissolved metal cations so that they form a coherent metal coating on an electrode. The term is also used for electrical oxidation of anions onto a solid substrate.
The part to be plated is the cathode of the circuit. The anode is made of the metal to be plated on the part. Both components are immersed in a solution called an electrolyte containing one or more dissolved metal salts as well as other ions that permit the flow of electricity. A power supply supplies a direct current to the anode, oxidizing the metal atoms that it comprises and allowing them to dissolve in the solution. At the cathode, the dissolved metal ions in the electrolyte solution are reduced at the interface between the solution and the cathode, such that they "plate out" onto the cathode. The rate at which the anode is dissolved is equal to the rate at which the cathode is plated depending on the current in the circuit. In this manner, the ions in the electrolyte bath are continuously replenished by the anode.
Hence, small amount of a mineral salt present naturally in water makes it a good conductor of electricity.