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Ionisable and Non-Ionisable Compounds

Which one of ...

Question

Which one of the following solutions would you use to test the pH of a given sample?
(1) blue litmus solution
(2) red litmus solution
(3) universal indicator solution
(4) mixture of red and blue litmus solution

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Solution

Universal indicator is made up of several solutions having a wide range of pH values, to indicate the acidity and alkalinity of solutions. So, to test a sample we would use a universal indicator.

Hence the correct option is 3.

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