Natural Indicators Around Us

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Important Questions

On washing with soap, a turmeric stain on the cloth turns to red because
A. soap solution is alkaline.
B. soap solution is acidic.
C. turmeric contains a natural indicator.
D. turmeric contain litmus.
Select the correct alternative.

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You are provided with three test tubes A, B and C which contain distilled water, acidic solution and basic solution respectively. If you are given blue litmus paper only, how will you identify the contents of each test tube.

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Which one of the following will turn blue-litmus red?

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Which of the following set of substances contain acids only?

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You are provided with three test tubes A, B and C as shown in Figure  with different liquids. What will you observe when you put
a) A piece of blue litmus paper in each test tube.
b) A piece of red litmus paper in each test tube.
c) A few drops of phenolphthalein solution to each test tube.

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State whether the following statements are true or false. Correct the false statements.

Phenolphthalein is a natural indicator.

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

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Which of the following is acid-base indicator?

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

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Look at Figure which shows solutions taken in test tubes A,B,C and D. What colour is expected when a piece of red litmus paper is dropped in each test tube?
Nature of the solutions is given in the table for your help.
TestNature of solutionChange in colour of red litmus
ANeutral
BBasic
CAcidic
DNeutral

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