Lemon juice contains ________ which when mixed with baking soda reacts to form carbon dioxide and sodium citrate causing the liquid to fizz and bubble.

citric acid

The correct answer is Option (3)- citric acid

Lemon juice contains citric acid, which, when mixed with baking soda (sodium bicarbonate), reacts to form carbon dioxide and sodium citrate, causing the liquid to fizz and bubble.

Explanation:

• Citric acid is a weak organic acid found in citrus fruits, including lemons.
• When citric acid reacts with baking soda (sodium bicarbonate), it undergoes an acid-base reaction.
• The reaction produces carbon dioxide gas, which creates bubbles and fizziness in the liquid.
• The chemical equation for the reaction is as follows: Citric acid (lemon juice+Baking soda→Carbon dioxide+Sodium citrate+Water

So, the correct answer is citric acid.