NCERT Exemplar Solutions
Class 10 - Science - CHAPTER 2: Acids, Bases and Salts - Long Answer QuestionsQuestion 46
Class 10 - Science - CHAPTER 2: Acids, Bases and Salts - Long Answer Questions
Question. 46
46. A dry pellet of a common base B, when kept in open absorbs moisture and turns sticky. The compound is also a by-product of chloralkali process. Identify B. What type of reaction occurs when B is treated with an acidic oxide? Write a balanced chemical equation for one such reaction.
Answer:
B = sodium hydroxide (\(\mathrm{NaOH}\)).
Type of reaction with acidic oxide (e.g. CO₂) — acid–base reaction (neutralisation) producing a salt and water/other product. Example: \(\mathrm{2NaOH + CO_2 \to Na_2CO_3 + H_2O}\).
Type of reaction with acidic oxide (e.g. CO₂) — acid–base reaction (neutralisation) producing a salt and water/other product. Example: \(\mathrm{2NaOH + CO_2 \to Na_2CO_3 + H_2O}\).
Detailed Answer with Explanation:
Steps: NaOH is hygroscopic (absorbs moisture). It reacts with acidic oxide CO₂ to form sodium carbonate and water (a neutralisation/acid–base reaction).