(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?
(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