What is the main chemical reason for the effect of acid rain on marble?
Answer and explanation
Correct answer: Marble contains calcium carbonate which reacts with acid
The governing reaction is the reaction of a carbonate with an acid. Marble is composed mainly of calcium carbonate, CaCO₃. Acidic rain supplies hydrogen ions, and carbonate reacts to produce a calcium salt, water, and carbon dioxide; for example, CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂. This gradually erodes the surface, so option A is correct. The other choices misidentify marble or reverse the effect of acids.
Frequently asked questions
What is the correct answer to this question?
Marble contains calcium carbonate which reacts with acid
Why is this the correct answer?
The governing reaction is the reaction of a carbonate with an acid. Marble is composed mainly of calcium carbonate, CaCO₃. Acidic rain supplies hydrogen ions, and carbonate reacts to produce a calcium salt, water, and carbon dioxide; for example, CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂. This gradually erodes the surface, so option A is correct. The other choices misidentify marble or reverse the effect of acids.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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