Question

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change
1.quick lime
2.ammonium hydroxide solution
3.hydrochloric acid
4.baking soda

Answer 1

I think HCl would be the answer...

As it is acidic in nature, excess addition of it can reverse the base( it is given that litmus turns red to blue)

So cheers.....

Answer 2

Answer:

The correct answer of this question is option 3, hydrochloric acid.

Explanation:

Litmus is actually an indicator substance which is used for rectifying acid and base.

The colour of the litmus is blue in the basic solution and the colour of the litmus is red in the acidic solution.

Similarly,to turn blue litmus into red,we have to use any acidic solution.And among the four options in the question , only option c is an acid.

That's why option c is the correct answer of this question.