Question

The electroplating of chromium is undertaken because
A) Electrolysis of chromium is easier
B) Chromium can form alloys with other metals
C) Chromium gives protective and decorative coating to the base metal
D) Of the high reactivity of metallic chromium

Answer 1

Hint: Electroplating is the term used to describe a method that involves using a direct electric current to reduce the cations of a metal to form a metal coating on a solid substrate. The cathode (negative electrode) of an electrolytic cell is the portion to be coated; the electrolyte is a solution of a salt of the metal to be coated; and the anode (positive electrode) is often a block of that metal or another inert conductive substance. An external power supply provides the current.

Complete answer:
Electroplating is frequently used in industry and the decorative arts to improve item surface properties like abrasion and corrosion resistance, lubricity, reflectivity, electrical conductivity, and beauty. It may also be used to increase the thickness of undersized or worn-out components, as well as to electroform metal plates with complicated shapes. It's also used to clean metals like copper. Occasionally, the term "electroplating" is applied to techniques that employ an electric current to accomplish an oxidation of anions on a solid substrate, such as the production of silver chloride on silver wire to create silver/silver-chloride electrodes. Electroplating a thin coating of chromium onto a metal item is known as chrome plating (or chromium plating). Chrome is the final result of chrome plating. The chromed coating might be attractive, offer corrosion protection, make cleaning easier, or improve the hardness of the surface. For cosmetic reasons, a less costly chrome imitator is sometimes employed. Higher cathode efficiency and throwing power are two functional advantages of trivalent chromium. Better throwing power equates to higher output rates. Because the current densities required are smaller, less energy is required. The following steps are usually followed when chrome plating a component:
Heavy soiling must be removed by degreasing.
Cleaning by hand to eliminate all traces of dirt and surface contaminants.
Depending on the substrate, several pretreatments are used.
Place it in the chrome plating vat and let it warm up to solution temperature.
To achieve the specified thickness, apply plating current for the needed period.

Hence option C is correct.

Note:
Depending on the type of substrate being plated, there are several variants to this technique. Various etching solutions, such as hydrochloric, hydrofluoric, and sulfuric acids, are required for different substrates. The etching of nimonic alloys with ferric chloride is very popular. When the component is electrically live, it may enter the chrome plating vat. A complying anode composed of lead/tin or platinized titanium is sometimes used in the component.