20. (a) What is a universal indicator ? For what purpose is it used ?
(b) How does a universal indicator work?
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A universal indicator is collectively a mixture of indicators which show a colour change in a solution . Which interprets how acidic or basic in nature
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Universal indicator is used to detect weather the given solution is an acid or an base and when it is dipped in any of the solution it changes its colors and informs us the type of solution and it is also an pH indicator and can be also used to detect the strength of the solution
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