Q.

What is a universal indicator?

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a

A type of physical indicator that measures temperature

b

A type of environmental indicator that measures air pollution

c

A type of chemical indicator that changes color based on the pH of a solution

d

A type of biological indicator that detects the presence of pathogens

answer is B.

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Detailed Solution

A universal indicator is a chemical species that changes color according to the pH of a solution.  It is a mixture of several different indicators that gives a wide range of colors depending upon the pH of the solution which is used to determine the acidity or basicity of a solution.

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