Question

Which of the following is a method of purifying water? A. Aeration B. Combustion C. Fixation D. Freezing

Answer 1

$\boxed{{\text{A}}{\text{. Aeration}}}$ is a method of purifying water.

Further Explanation:

A. Aeration

The technique in which air is dissolved in any liquid or substance is called aeration. It is also known as aerification or aeriation. It can be done by allowing air to pass through a liquid with the help of aeration turbines. Due to this process, water and air are brought closer to each other and as a result, dissolved gases are removed from the water. It is the initial step at the water treatment plant. It is also helpful to remove dissolved metals via oxidation, followed by filtration.

Generally, ammonia, carbon dioxide, methane, hydrogen sulfide, iron, manganese and volatile organic compounds like benzene are removed from water through the process of aeration.

B. Combustion

It is a type of chemical reaction occurring between any fuel and an oxidizing agent. It usually takes place when the hydrocarbon is allowed to react with oxygen. Energy, normally in the form of heat and light is produced during this process.

C. Fixation

It is a process that is required to fix a specimen with chemicals in order to stop autolysis during the preparation of the specimen. It has to be carried out just after the removal of tissues to avoid autolysis.

D. Freezing

It is a phase transition that occurs when a substance is to be converted from its liquid to a solid state. This is done by lowering the temperature of the substance below its freezing point. For example, water is transformed into ice by the process of freezing.

Therefore aeration is used to purify water.

Learn more:

1. Identify the phase change in which crystal lattice is formed: brainly.com/question/1503216
2. The main purpose of conducting experiments: brainly.com/question/5096428

Answer details:

Grade: Senior School

Chapter: Methods of purification

Subject: Chemistry

Keywords: aeration, fixation, combustion, freezing, purify, water, solid, liquid, specimen, autolysis, air, aeration tubes.

Answer 2

Answer: A 


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