Concept:Soda water is made by dissolving carbon dioxide gas under high pressure into water, producing a fizzy, bubbly drink.
Explanation:Soda water is also known as carbonated water or sparkling water.
Carbon dioxide gas is forced into water under pressure, where it dissolves and forms carbonic acid.
This gives the water its characteristic bubbles and slightly tangy taste.
When the bottle is opened, the pressure drops and the gas escapes as bubbles.
Other gases like carbon monoxide, oxygen, or marsh gas (methane) cannot produce the same fizzy effect safely.
Carbon dioxide is non-toxic and widely used in the beverage industry for carbonation.
Therefore, the gas used in soda water is carbon dioxide.
Answer:Option B – Carbon dioxide.