Question

Effervescence is seen when a bottle of soda water is opened.
(A) True
(B) False

Answer 1

Hint: The soda water is also known as carbonated water. In the soda water, carbon dioxide is dissolved under high pressure. Soda waters are widely used in carbonated beverages.

Complete answer:
Before judging the truth of the statement mentioned above, let us first know about the soda water.
What is soda water?
 Soda water is a special type of water in which carbon dioxide ($C{ O }_{ 2 }$) is dissolved. The carbon dioxide is injected artificially into water and it stays under high pressure in the water. The soda water is also known as carbonated water.
In some soda waters or sparkling mineral waters, a small amount of other minerals like sodium bicarbonate or potassium bicarbonate is also added. The carbonated waters are the most widely used component in the soft drink market.
Now, let us know why effervescence occurs when a bottle of soda is opened.
As it has been mentioned before, in the soda water, carbon dioxide gas is dissolved under high pressure. When the cap of the bottle is opened, the dissolved carbon dioxide gas is depressurized suddenly. As a result, the depressurized carbon dioxide desperately wants to expand. Hence, at this point, the water cannot hold that much of carbon dioxide and some of the dissolved carbon dioxide gets released from the water. This excess carbon dioxide gets released as bubbles and hence, the effervescence is created.
Thus, we can say, it is true that effervescence is observed when a soda bottle is opened.
Hence, option A is the correct answer to this question.

Note: Carbon dioxide stays under high pressure in soda water. When the bottle cap is opened, there is a sudden release of pressure due to which some of the carbon dioxide is released as bubbles. These bubbles are observed by us as effervescence.