Electrolysis Test - 2

Water is decomposed into hydrogen and oxygen by means of an electric current by the method of Electrolysis.

• Producing chemical changes in an electrolyte by passing a current through it.
• The principle of electrolysis is, whenever the DC electric current is made to pass through the solution of salt, some metals can be separated from it.
• Water is decomposed into hydrogen and oxygen by means of an electric current.

 Hence, the correct option is (A).

Reduction occurs by the cathode electrode during electrolysis.

Electrolysis:

• Passing of direct electric current in the compound.
• It decomposes ionic compounds into their elements.

At Cathode:

• Reduction occurs at the cathode.
• It acts as a positive terminal.

At Anode:

• Oxidation occurs at the anode.
• It acts as a negative terminal.

Hence, the correct option is (B).

When a beam of light is passed through a colloidal solution, colloidal particles scatter light and we can see the path of light. Thus, the Tyndall effect is observed.

​The Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions and some very fine suspensions. Therefore, it can be used to verify if a given solution is a colloid. The intensity of scattered light depends on the density of the colloidal particles as well as the frequency of the incident light.

When a beam of light passes through a colloid, the colloidal particles present in the solution do not allow the beam to completely pass through. The light collides with the colloidal particles and is scattered (it deviates from its normal trajectory, which is a straight line). This scattering makes the path of the light beam visible.

Hence, the correct option is (A).

Electrolysis is not applicable in the process of photography.

Electrolysis is used for the following applications:

• Purification of metals: The impure metals can be purified by the electrolysis process. Pure metals like aluminum, copper, iron, and titanium are separated by their ores by the electrolysis process.
• Electrotyping: Electrotyping (Electro-forming) is a chemical method for forming metal parts that exactly reproduce a model. It is also done by electrolysis.
• Electroplating: Electroplating is the process of coating a metal with a thin layer of another metal by electrolysis to improve the metals. It is also done by electrolysis.
• On a large scale, various chemicals can be produced by electrolysis.
• The Reduction of Metals from their Compounds is done by electrolysis.

Photography: Photographic film captures the image formed by light reflecting from the surface being photographed.

• The sensitive elements in the film are crystals of, most often, silver halide which can change their structure when excited by light (photons).
• So it is not an application of the electrolysis process.

Hence, the correct option is (B).