MCQ practice · SSC Chemistry Board questions · Chapter 9: Acid-Base Balance
Which gas will form when lemon juice is added to eggshell?
Think it through first, then pick an option.
- a SO₂
- b CO₂
- c H₂
- d Cl₂
Answer and explanation
Correct answer: b CO₂
Eggshell is mainly CaCO₃; the acid in lemon juice gives CO₂ with a carbonate.
Why the other options are wrong
- a SO₂: No SO₂ forms; eggshell is CaCO₃ and gives CO₂ with acid.
- c H₂: H₂ comes from reactive metals; eggshell is a carbonate, not a metal.
- d Cl₂: No Cl₂ forms; carbonate + acid gives CO₂.
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