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Question
A student puts a drop of acetic acid first on a blue litmus paper and then on a red litmus paper. He would observe that
(A) the red litmus paper turns colourless and there is no change in the blue litmus paper.
(B) the red litmus paper turns blue and the blue litmus paper turns red.
(C) there is no change in the red litmus paper and the blue litmus paper turns red.
(D) there is no change in the blue litmus paper and the red litmus paper turns blue.
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Solution
Being an acid, acetic acid turns blue litmus paper red. Thus, on putting a drop of acetic acid on blue and red litmus papers, there is no change in the red litmus paper, while the blue litmus paper turns red.
Hence, the correct option is C.
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