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

Alkaline.

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Acidic and neutral.

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Acidic and alkaline.

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None of these

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Solution

The correct option is B Acidic and neutral.
Phenolphthalein is an acid-base indicator which is colourless in acidic and neutral solutions. It turns pink to red in alkaline solutions.

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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

Q. Mention the colour changes observed when the following indicators are added to acids:
(a) Alkaline phenolphthalein solution.
(b) Methyl orange solution.
(c) Neutral litmus solution.

Name an indicator which is pink in alkaline solution but turns colourless in acidic solution.

Q. Phenolphthalein indicator is colourless in an acid and turns pink in an alkaline solution. When an aqueous solution of potassium iodide is electrolysed with phenolphthale in indicator, what colours appear at the electrodes?
Cathode:

2 H_{2} O_{(l)} + 2 e^{-} \to H_{(g)} + 2 O H^{-} (a q)

Anode:

2 I_{(a q)}^{-} \to I_{2 (s)} + 2 e^{-}

Q. Turmeric is a natural indicator. On adding its paste to acid and base separately, which colour would be observed ?

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

The correct option is B Acidic and neutral.Phenolphthalein is an acid-base indicator which is colourless in acidic and neutral solutions. It turns pink to red in alkaline solutions.

The correct option is B Acidic and neutral.
Phenolphthalein is an acid-base indicator which is colourless in acidic and neutral solutions. It turns pink to red in alkaline solutions.