Q.

Sour taste of lemon is due to the presence of which of the follow-ing?

A. Citric acid
B. Acetic acid
C. Oxalic acid
D. Formic acid
Answer» A. Citric acid
Explanation: Lemon juice is about 5% citric acid, which gives lemons a sour taste and a pH of 2 to 3. Citric acid is found in many fruits but lemon contains large quantity of citric acid. The distinctive sour taste of lemon juice makes it a key ingredient in drinks and foods such as lemonade and lemon meringue pie.
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