CBSE Class 7 Science
Question 8 of 19
Exploring Substances Acidic Basic and Neutral — Question 8
Back to all questions 8
Question A solution turns the red litmus paper to blue. Excess addition of which of the following solution would reverse the change?
(i) Lime water
(ii) Baking soda
(iii) Vinegar
(iv) Common salt solution
(iii) The solution turns from red to blue, it means it is basic. To reverse this, an acid is needed. Lime water and baking soda are basic, and the common salt solution is neutral, so they will not reverse the change. Vinegar is acidic, so it will change the colour back to red.