Which of the following is a disadvantage of using a universal indicator?

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It is expensive and difficult to obtain

It can only measure the pH of a solution accurately within a narrow range

It is not sensitive to changes in pH

It is toxic and can cause harm to the user

answer is A.

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Detailed Solution

A universal indicator can give a rough approximate reading for the pH of a solution and also it is not accurate within a narrow range. As the natural indicator is a mixture of several different indicators that give a range of colors depending on the pH of the solution. In order to get a more accurate reading of pH, a more specific indicator should be used.

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