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Select a pair of natural indicator from the following :
What colour does red litmus paper turn when dipped into a solution of sodium hydroxide (NaOH)?
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Assertion (A): Litmus solution extracted from lichens turns red in acidic solutions and blue in basic solutions. Reason (R): Litmus is a natural indicator that changes colour depending on the pH of the solution it is placed in.
Litmus solution is extracted from:
