Question

When a drop of an unknown solution X is placed on a strip of pH paper, a deep blue colour is produced.This solution should be:
a)NaOH
b) Lemon juice
c)Water
d)HCL

Answer 1

Hey dear friend ,

When a drop of an unknown solution X is placed on a strip of a ph paper it shows blue colour , it means it is acid , so it is - LEMON JUICE .

Answer 2

alkaline substances change red litmus to blue so lemon juice is right one