When bubbles are observed in a reaction mixture, what do they most commonly indicate?
Answer and explanation
Correct answer: Evolution of a gas
A common visible indicator of a chemical reaction is the evolution of a gas. If a gaseous product is formed in the liquid mixture, it escapes as bubbles, so option A is the best answer. Melting changes the physical state of a solid, a precipitate is an insoluble solid that settles or remains suspended, and a colour change alone does not specifically explain bubbles. Therefore B, C, and D do not fit.
Frequently asked questions
What is the correct answer to this question?
Evolution of a gas
Why is this the correct answer?
A common visible indicator of a chemical reaction is the evolution of a gas. If a gaseous product is formed in the liquid mixture, it escapes as bubbles, so option A is the best answer. Melting changes the physical state of a solid, a precipitate is an insoluble solid that settles or remains suspended, and a colour change alone does not specifically explain bubbles. Therefore B, C, and D do not fit.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
