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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Q. On adding phenolphthalein indicator to a colourless solution, no change is observed. What can be the nature of this solution?

Question 13

State whether the following statements are true or false. Correct the false statements.
(a) All substances are either acidic or basic.
(b) A compound if acidic will turn all indicators red
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(d) Common salt dissolved in water turns blue litmus red
(e) Phenolphthalein is a natural indicator
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Q. Olfactory indicators change their colour when added to an acidic or a basic solution.

State whether the following statements are true or false. Correct the false statements. [5 MARKS]
(a) All substances are either acidic or basic.
(b) A compound if acidic will turn all indicators red.
(c) Lime water turns red litmus blue.
(d) Common salt dissolved in water turns blue litmus red.
(e) Phenolphthalein is a natural indicator.

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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