CBSE Class 10 Science 2019 · Paper 31/3/2 · Question 14
A dry pellet of a common base B, when kept in open absorbs moisture and turns sticky. The compound B is also a by-product of chlor-alkali process. Identify B. State the type of reaction that occurs when B is treated with an acidic oxide, say sulphur dioxide. Also write chemical equation for the reaction involved.
Answer
B is sodium hydroxide; its reaction with sulphur dioxide is neutralisation: .
B is sodium hydroxide, NaOH. Its dry pellets absorb moisture from the air and turn sticky (it is deliquescent), and it is produced in the chlor-alkali process, the electrolysis of brine: .
When B is treated with an acidic oxide such as sulphur dioxide, a neutralisation reaction takes place: a base reacts with an acidic oxide to give a salt and water.
(sodium sulphite and water).
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