Q.

Which of the following will turn red litmus blue?

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a

Washing soda

b

Soft drink 

c

Vinegar

d

Baking soda

answer is D.

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Detailed Solution

The blue litmus paper will turn red when it comes into contact with an acidic solution. 

Baking soda, washing soda and soft drinks are basic in nature. Vinegar is an aqueous solution of acid. So, it will release H+ ions in an aqueous solution and turn red litmus into the blue.

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