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CBSE Class 10 Science 2016 Term 1 Paper

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Question : 4 of 36
Marks: +1, -0
Two solutions A and B have pH\mathrm{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 pH 3\mathrm{pH}\,3 which is acidic in nature.
(ii) Solution B will turn phenolphthalein from colourless to pink as it is basic in nature having pH 10.5\mathrm{pH}\,10.5.
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