Question

When vinegar is added to baking soda, confirms the occurrence of a chemical change.

• A. evolution of gas
• B. change in colour
• C. change in state

Answer 1

The correct option is A evolution of gas

Vinegar (acetic acid) reacts with baking soda (sodium bicarbonate) to form sodium acetate salt along with carbon dioxide gas and water. This can be represented as:

Acetic acid + Sodium bicarbonate $\to$ Sodium acetate + Carbon dioxide + Water

The carbon dioxide gas evolved causes effervescence and confirms the occurrence of a chemical change.