(i) Why do we add ethanol to petrol in these days?
(ii) Give one use of ethanol in medicines.
(iii) Why is vinegar used in pickles?
Answers
Answer:
Explanation:
(i) Ethanol is added to petrol because ethanol is a cleaner fuel which when
burnt in a sufficient amount of air to give carbon dioxide and water
(ii) Ethanol is a good solvent and is widely used in cough syrups and tonics.
(iii) Vinegar is a commonly used preservative. It helps in storing food for a long time
Answer:
(i) Ethanol is added to petrol in these days because it reduces the carbon monoxide emissions from the petrol and fuel octane is improved
(ii) Ethanol is used as a disinfectant in medicines like tinctures.
(iii) Vinegar is used in the food products that are to be preserved. It slows or stops the food from spoiling. The pH of vinegar inhibits bacterial growth which is known as pickling process. So they are also used in the pickles.