Description : Citric acid is present in free form in – (1) Tamarind (2) Milk (3) Apple (4) Lemon
Last Answer : (4) Lemon Explanation: Lemons, oranges, limes, and other citrus fruits naturally possess high concentrations of citric acid. The juice of the lemon is about 5% to 6% citric acid, which gives lemons ... first isolated in 1784 by the chemist Carl Wil-helm Scheele, who crystallized it from lemon juice.