Question

what will be the change in colour of PH strip when it us dipped into (i) HCI SOLUTION (ii) NaOH solution (iii) lemon juice

Answer 1

HCI SOLUTION - Blue to red
(ii) NaOH solution - Red to Blue
(iii) lemon juice - Blue to red

Answer 2

Since HCl is a strong acid so the color of the pH strip will change to red.
Being a strong alkali, NaOH will turn the strip into purple color. And lastly lemon juice contains mostly citric acid. So it will give red color.