Question

Which of the following changes the blue litmus red ?

This question has multiple correct options
A

B

C

D

Medium

Solution

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Correct option is
B

C

D

Blue litmus paper turns red under acidic conditions, under pH below 4.5.

methanoic acid, ethanoic acid and propanoic acid all have pH below 4.5 so all will change blue litmus red. but ethanol cannot change the colour of blue litmus paper as it has pH above 4.5. 

Out of these the most acidic is Methanoic acid.

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