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Standard XII
Chemistry
Question

Four students were given colourless liquids A,B,C of water, lemon juice and a mixture of water and lemon juice respectively. After testing these liquids with pH paper, following sequence in colour change of pH paper were reported :
I. Blue, Red and Green II. Orange, Green and Green
III. Purple, Red and Green IV.Green, Red and Red

The correct sequence of colours observed is-

  1. I
  2. II
  3. IV
  4. III

A
IV
B
I
C
III
D
II
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Solution
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The given solutions are respectively neutral, acidic and acidic solution.
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Q1
Four students were given colourless liquids A,B,C of water, lemon juice and a mixture of water and lemon juice respectively. After testing these liquids with pH paper, following sequence in colour change of pH paper were reported :
I. Blue, Red and Green II. Orange, Green and Green
III. Purple, Red and Green IV.Green, Red and Red

The correct sequence of colours observed is-

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Q2
Three students were given colourless liquids of water, lemon juice and mixture of water and lemon juice After testing these liquids with pH paper a sequence in colour change of pH paper was reported Which is the correct sequence?
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A student tests the pH of pure water using a pH paper. It shows the green color. If a pH paper is used after adding lemon juice to water, what color will be observed?
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Q4

In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations.

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Which one will have pH value of 7?


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Q5
The two colours seen at the extreme ends of the pH chart are:
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