A solution turns the red litmus paper to blue. Excess addition of which of the following solution Class 7
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A solution turns the red litmus paper to blue. Excess addition of which of the following solution Class 7
A solution turns the red litmus paper to blue. Excess addition of which of the following solution would reverse the change? Class 7
(i) Lime water
(ii) Baking soda
(iii) Vinegar
(iv) Common salt solution
Answer:
(iii) Vinegar. As the solution turns from red to blue, it means it is basic.
Justification: To reverse this change, an acid like (iii) vinegar is needed and will change the colour back to red. As the lime water and baking soda are basic, and the common salt solution is neutral, so they will not reverse the change.