Question 10

On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
(a) Basic
(b) Either acidic or basic
(c) Either acidic or neutral
(d) Either basic or neutral

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Solution

Phenolphthalein changes to pink when added to a basic solution. It does not change colour in either an acidic solution or a neutral solution. So, c is the correct option.

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Phenolphthalein

Standard VII Chemistry

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Question 10 On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution? (a) Basic (b) Either acidic or basic (c) Either acidic or neutral (d) Either basic or neutral

Phenolphthalein changes to pink when added to a basic solution. It does not change colour in either an acidic solution or a neutral solution. So, c is the correct option.

Question 10

On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
(a) Basic
(b) Either acidic or basic
(c) Either acidic or neutral
(d) Either basic or neutral