When you open a soft drink bottle, the bubbles ooze through the opening. The bottle contains gas which is highly compressed. Guess the gas.
A. Dry ice
B. Carbon dioxide
C. Oxygen
D. Nitrogen

Hint: This is a simple experiment which can be checked in home. Soft drink is also termed as sugary drink. Generally it can be explained as a drink which has no alcohol content. It is different from hard drinks which are alcoholic drinks.

Complete step by step solution:
Soft drinks can be carbonated or noncarbonated. Carbonated drinks have carbon dioxide in it. Some carbonated soft drinks are Pepsi, coke, Fanta etc. Non-carbonated drinks do not have carbon dioxide in it. Some non-carbonated soft drinks are juices, nectar, squashes.
The carbon dioxide in the carbonated drinks make them bubbly or fizzy. It also contains acid, mostly phosphoric acid. It makes the pH as low as three.
Carbon dioxide is the reason for the sparkling appearance of the soft drinks and it has a sour taste. This is added to prevent spoilage. Carbonation is the process of dissolving carbon dioxide in any liquid. Usually, it is added with a lot of pressure in it. Due to this pressure, when we open the soft drink bottle, the bubble oozes through the opening.
Also when we open the carbonated soft drinks for some period of time, the drink tastes flat since all the carbon dioxide molecules have escaped.
Hence carbon dioxide is the reason for the bubbles when we open the bottle of soft drink.

So the correct option is B.

Note: Carbonated drinks cause burping due to the presence of carbon dioxide. It also causes heartburn or acid reflux disease. The reaction of carbonation is given below:
${{\text{H}}_2}{\text{O}} + {\text{C}}{{\text{O}}_2} \to {{\text{H}}_2}{\text{C}}{{\text{O}}_3}$, where ${{\text{H}}_2}{\text{C}}{{\text{O}}_3}$ is the carbonic acid.
Cooling is done to prevent the escaping of carbon dioxide molecules into air.