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