i. Acids are sour in taste

ii. The chemical nature of such substances is acidic

iii. Acid turns blue litmus red

iv. Do not give any colour with phenolphthalein indicator

v. Acids are generally found in Vinegar, Curd, Spinach, lemons, Citrus fruits, Amla, Tamarind, grapes, unripe mangoes, Citrus fruits such as oranges, etc.