The pH of lemon juice is:

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2.2 to 2.4

answer is D.

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Detailed Solution

Concept- Substances can be classified as acidic, basic and neutral on the basis of their chemical properties.Acidic substances release hydrogen ions (

H^{+}

) in their solution, basic substances release hydroxide ions (

{OH}^{-}

) in their solution and neutral substances have equal numbers of hydrogen ions and hydroxide ions.
Now, pH scale is a scale that tells whether a substance is acidic, basic or neutral and it ranges from 1-14. pH 7 means the solution is neutral, pH less than 7 means the solution is acidic and pH more than 7 means the solution is basic.
Lemon juice's pH ranges from 2.2 to 2.4, making it a very acidic substance by nature.
Due to the high concentration of citric acid in lemon juice, it has an acidic character.
Hence, the correct option is (4).

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