Question
Which substance would you use to test if lemon juice contains acid?
This question was previously asked in
RRB NTPC 2025 Graduate CBT 2 Question Paper PDF (10-Jul-2026) (Shift 1)
The correct answer is
Litmus paper
Litmus paper changes color in the presence of an acid, making it the substance used to test if lemon juice contains acid.
Water, baking soda and sugar do not provide a visible chemical indication of acidity in the way litmus paper does.
Hence, Litmus paper is the correct answer.
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