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6. Universal indicator paper is used to tell whether chemicals are acid or alkali.
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6. Universal indicator paper is used to tell whether chemicals are acid or alkali.

User Jonathon Faust
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A universal indicator can be in paper form or present in a form of a solution.
Paper form: It is a strip of coloured paper which changes colour to red if the solution is acidic and to blue, if the solution is basic.
User Bruce Nielson
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