Sudha took lemon juice in two flasks. She put salt in flask 1 and washing soda in flask II. She observed lots of bubbles in flask Il but nothing in flask I. What could be the reason for this?

Options

A. In flask I, a chemical change takes place.
B. In flask II, a chemical change takes place and bubbles of carbon dioxide are seen.
C. In flask II, a physical change takes place producing lots of bubbles.
D. In flask I, salt reacts with lemon juice and forms a new compound.

Answer

B

Explanation

Lemon juice (acid) reacts with washing soda (base) and liberates carbon dioxide gas i.e., a new substance is formed. Thus, it is a chemical change. Addition of salt in lemon juice is a physical change as salt only gets dissolved in lemon juice, no chemical reaction takes place.