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Class 7
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Chemistry
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Acids, Bases and Salts
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Natural Indicators Around Us
Natural Indicators Around Us
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Important Questions
Phenolphthalein is a synthetic indicator and its color in acidic and basic solutions, respectively are:
Medium
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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.
Easy
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Which one of the following will turn blue-litmus red?
Medium
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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.
Medium
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Which of the following set of substances contain acids only?
Medium
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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.
Medium
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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.
Test
Nature of solution
Change in colour of red litmus
A
Neutral
B
Basic
C
Acidic
D
Neutral
Medium
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In the titration of ferrous ammonium sulphate and potassium dichromate, the external indicator used is:
Medium
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An organic dye, cousins used to detect the endpoint of precipitation titration by the process of
Hard
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An aqueous solution turns red litmus blue. Excess addition of which of the following solution would reverse the change?
Medium
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