CBSE Class 10 Science 2016 Term 1 Paper

Question : 4

Total: 36

Two solutions A and B have pH values of 3.0 and 10.5 respectively. Which of these will turn :
(i) Blue litmus solution to red and
(ii) Phenolphthalein from colourless to pink?
Justify your answer in each case.

Solution:

(i) Solution A will turn blue litmus red as it has pH‌3 which is acidic in nature.
(ii) Solution B will turn phenolphthalein from colourless to pink as it is basic in nature having pH‌10.5.

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