Question

if the red litmus changes its colour so the given solution will be​

Answer 1

Answer:

The main use of litmus is to test whether a solution is acidic or basic. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).

Answer 2

Basic solution

It has the property to change red litmus blue in colour.

eg:- soap solution, potassium hydroxide etc.