Homework Answers
Solution: 7
Oxide that gives an acidic solution when dissolved in water is to be determined.
(a) SO2
When SO2 is dissolved in water. It undergoes a reaction in order to form sulfurous acid. This compound is one of the components of acid rain. The chemical reaction is shown below:
Therefore, SO2 is acidic when dissolved in water.
(b) NO2
When NO2 is dissolved in water. It reacts with water to form nitric acid. Nitric acid is known as one of the components of acid rain. The chemical reaction is shown below:
Therefore, NO2 is acidic when dissolved in water.
(c) Na2O
Sodium oxide (Na2O) is a strongly basic salt. It gives sodium hydroxide on reaction with water. The chemical reaction is as follows:
Therefore, Na2O is basic when dissolved in water.
(d) CaO
Calcium oxide (CaO) has a basic chemical nature. It gives calcium hydroxide on reaction with water. The chemical reaction is as follows:
Therefore, CaO is basic when dissolved in water.
(e)
Two of these.
Answer: Since both SO2 and NO2 are acidic in nature. The correct option is (e).
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