Which of the following is used to test whether a substance is acidic or basic?
Litmus solution
Sugar solution, distilled water, and salt solution are all chemically neutral and do not change colour in the presence of acids or bases, so they cannot be used as indicators.
Litmus solution is a natural indicator extracted from lichens that turns red in acidic conditions and blue in basic conditions.
This distinct colour change makes litmus solution a simple and reliable way to test whether a substance is acidic or basic.
Hence, the correct answer is litmus solution.
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