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Q.

In an experiment a solution turned red litmus paper to blue color. So the solution may be

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a

Pure water

b

Surf water

c

Lemon Juice

d

Sugar water

answer is D.

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Detailed Solution

Surf water is a basic solution and it turns red litmus paper to blue color. Pure water is neutral since its pH is 7.

A sugar solution is completely neutral since sugar can't take hydrogen ions out of the water or donate them in. 

Lemon juice – Acidic; since its pH < 7.

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