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Study the following statements
I) Blue litmus turn red in acidic medium
II) Red litmus turn blue in basic medium
III) Both blue and red litmus show no change in neutral medium
IV) When an acid is mixed with a base, the resulting solution change of colour with litmus

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I and II are correct

III and IV are correct

II and IV are correct

All are correct

answer is D.

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Detailed Solution

Acids turn blue litmus to red in acidic medium. Bases turn red litmus to blue in basic medium, the colour of blue or red litmus papers does not change in neutral medium.

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