Updated By SaraNextGen

On April 21, 2024, 11:35 AM

Question 7.18:

Why does O₃ act as a powerful oxidising agent?

Answer:

Ozone is not a very stable compound under normal conditions and decomposes readily on heating to give a molecule of oxygen and nascent oxygen. Nascent oxygen, being a free radical, is very reactive.

Therefore, ozone acts as a powerful oxidising agent.

Question 7.19:

How is O₃ estimated quantitatively?

Answer:

Quantitatively, ozone can be estimated with the help of potassium iodide. When ozone is made to react with potassium iodide solution buffered with a borate buffer (pH 9.2), iodine is liberated. This liberated iodine can be titrated against a standard solution of sodium thiosulphate using starch as an indicator. The reactions involved in the process are given below.