In which reaction is carbon dioxide gas most likely to be evolved?
Answer and explanation
Correct answer: Sodium carbonate and hydrochloric acid
The governing reaction pattern is acid plus carbonate producing salt, water, and carbon dioxide. Sodium carbonate reacts with hydrochloric acid as Na2CO3 + 2HCl → 2NaCl + H2O + CO2↑, so option B is correct. Zinc with acid usually releases hydrogen, sodium hydroxide with acid gives neutralisation, and magnesium oxide with acid gives salt and water without carbon dioxide.
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What is the correct answer to this question?
Sodium carbonate and hydrochloric acid
Why is this the correct answer?
The governing reaction pattern is acid plus carbonate producing salt, water, and carbon dioxide. Sodium carbonate reacts with hydrochloric acid as Na2CO3 + 2HCl → 2NaCl + H2O + CO2↑, so option B is correct. Zinc with acid usually releases hydrogen, sodium hydroxide with acid gives neutralisation, and magnesium oxide with acid gives salt and water without carbon dioxide.
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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