Question 4

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are
(a) red and blue.
(b) blue and red.
(c) pink and colourless.
(d) colourless and pink

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Solution

Phenolpthalein is a man-made visual indicator used to check acidity or basicity of solutions. Phenolphthalein is colourless in an acidic solution and turns pink in a basic solution.

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Question 3

Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed
(a) Yellow in both acid and base.
(b) Yellow in acid and red in base.
(c) Pink in acid and yellow in base.
(d) Red in acid and blue in base.

Question 4

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are
(a) red and blue.
(b) blue and red.
(c) pink and colourless.
(d) colourless and pink

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are

Q. Study the following table carefully and identify X, Y and Z.

Substance	TurmericSolution	Indicator (Y)	Indicator (Z)
Curd	Yellow	Red	Colourless
X	Red	Blue	Pink
Toothpaste	Red	Blue	Pink

Q. . A drop of vinegar is added to phenolphthalein indicator and its colour gets changed into
(1) Colourless (2) Pink
(3) Yellow (4) Blue

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Phenolphthalein

Standard VII Chemistry

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Question 4 Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are (a) red and blue. (b) blue and red. (c) pink and colourless. (d) colourless and pink

Phenolpthalein is a man-made visual indicator used to check acidity or basicity of solutions. Phenolphthalein is colourless in an acidic solution and turns pink in a basic solution.

Question 4

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are
(a) red and blue.
(b) blue and red.
(c) pink and colourless.
(d) colourless and pink