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Effect on Indicators by Acids and Bases

The indicator...

Question

The indicator which produces a pink colour in an alkaline solution is :

(a) methyl orange

(b) turmeric paper

(c) phenolphthalein

(d) litmus paper

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Solution

In acid-base titrations, phenolphthalein is used as an indicator and give pink color in basic solutions. So option c is correct.

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Similar questions

The indicators which turn red in acid solution are :

(a) turmeric and litmus

(b) phenolphthalein and methyl orange

(c) litmus and methyl orange

(d) phenolphthalein and litmus

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.

Q. Which of the following is incorrectly matched?

	Indicator	Colour change in basic medium
(1)	Litmus paper	Red to blue
(2)	Methyl orange	Orange to red
(3)	Phenolphthalein	Colourless to pink
(4)	Turmeric	Yellow to reddish brown

Q. (a) What is an indicator? Name three common indicators.
(b) Name the acid-base indicator extracted from lichen.
(c) What colour does the turmeric paper turn when put in an alkaline solution?

Q. Which of the following is not an acid-base indicator?

(a) blue litmus
(b) methyl orange
(c) phenolphthalein
(d) Digene

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Effect on Indicators by Acids and Bases

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