State whether the following statement is true or false:

To show that air is dissolved in the water we take water in a pan and heat it. Just before it boils, you will notice some bubbles at the inner surface of the pan. These bubbles are formed because of air dissolved in water.

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True

False

answer is A.

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Detailed Solution

The given statement is true.
Concept: Water is an all-purpose solvent that can dissolve almost any substance. At room temperature, it is a colourless, odourless, and tasteless liquid. Its chemical formula is H2O. It has 2 moles of hydrogen and 1 mole of oxygen in it. As a result, it's clear that it's made of air.

2 H_{2} O = 2 H_{2} + O_{2}

.
To demonstrate that it is made of air, we can perform the following simple experiment.
Take some water and observe it in a vessel. Boil the water now. What are your observations?
There are bubbles in the water-filled vessel, as we can observe. The evacuation of air that has been dissolved in the water causes these bubbles to appear.
Due to the increase in temperature, the solubility of gases in water decreases. The increase in temperature increases the kinetic energy of the molecules, resulting in breaking of intermolecular bonds.And hence, the air dissolved in the water is expelled out.
Hence, the given statement is true.

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