Citric acid is present in free form in
A
Tamarind
B
Milk
C
Apple
D
Lemon
Correct Answer: Lemon
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 a sour taste. In fact, Citric acid was first isolated in 1784 by the chemist Carl Wilhelm Scheele, who crystallized it from lemon juice.