Question

A small amount of copper oxide was taken in a beaker and dilute hydrochloric acid was added with continuous stirring of the solution. Name the compound formed and state the colour of its solution. Write balanced chemical equation for the reaction that occurs. Based on the reaction, state the nature (acidic/basic) of copper oxide.

Assertion (A) : Oxides of metals show basic characters. Reason (R) : Oxides of metals react with acid to form salt and water.

Sodium metal is stored under kerosene oil. Why ?

Some metal oxides are soluble in water. What are the aqueous solutions of these oxides called ? Write one example of such a solution.