Question

(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?

Answer 1

(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.