Question

why litmus rubbed with lemon

Answer 1

heya

lemon is rubbed with litmus to test whether it is acid or base

Answer 2

Hi there!

When litmus is rubbed against lemon, blue litmus turns red and red litmus doesn't change colour. This is because lemon has an acid which gives it a sour taste. This acid is citric acid. Litmus is a natural indicator, which helps us to determine whether a given substance is an acid or a base.

Hope it helps!!