Question

A sample of air is slowly passed through aqueous Sodium hydroxide and then over heater copper.

Answer 1

Answer:

Option b) Carbon dioxide and oxygen

Explanation:

Thinking process:

Sodium hydroxide is an alkaline solid substance. It reacts with acids to form salts and water. In this case, it is known that carbon dioxide, CO₂, is an acidic gas. Therefore, the reaction gives a salt that results in carbon dioxide being absorbed by the sodium hydroxide.

Heated copper is an excellent removal of oxygen. This is because monovalent copper, Cu, has a deep binding affinity for oxygen.  Hence the the oxygen trapped by the atom.

Answer 2

A sample of air is slowly passed through aqueous Sodium hydroxide and then over heater copper Carbon dioxide and oxygen.