Respuesta :
Answer: e. Two of these
Explanation:
(a) [tex]SO_2[/tex]
When [tex]SO_2[/tex] is dissolved in water. It reacts to form sulfurous acid. The chemical reaction is shown below:
[tex]SO_2+H_2O\rightarrow H2SO_3[/tex]
Therefore, [tex]SO_2[/tex] is acidic when dissolved in water.
(b) [tex]NO_2[/tex]
When [tex]NO_2[/tex] is dissolved in water. It reacts to form nitric acid. The chemical reaction is shown below:
[tex]3NO_2+H_2O\rightarrow 2HNO_3+NO[/tex]
Therefore, [tex]NO_2[/tex] is acidic when dissolved in water.
(c) [tex]Na[/tex]
Sodium is a metal. It gives sodium hydroxide on reaction with water. The chemical reaction is as follows:
[tex] Na+H_2O\rightarrow NaOH +H_2[/tex]
Therefore, Na is basic when dissolved in water.
(d) [tex]CaO [/tex]
Calcium oxide is a metallic salt. It gives calcium hydroxide on reaction with water. The chemical reaction is as follows:
[tex]CaO+H_2O\rightarrow Ca(OH)_2[/tex],
Therefore, [tex]CaO [/tex] is basic when dissolved in water.
(e) Two of these.
Since both [tex]SO_2[/tex] and [tex]NO_2[/tex] give acids when dissolved in water, both are acidic.
