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Question

Three test tubes contains different solutions and are labelled as A, B and C. The table below shows the observations when red and blue litmus papers were dipped in these test tubes.
Analyse the table given below and choose the correct options from the following.

Test tube ATest tube BTest tube CRed LitmusNo changeNo changeNo changeBlue LitmusRedNo changeRed

A
The sample in test tube A is acidic
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B
The sample in test tube A is neutral
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C
The sample in test tube C is acidic
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D
The sample in test tube B is neutral
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Solution

The correct options are
A The sample in test tube A is acidic
C The sample in test tube C is acidic
D The sample in test tube B is neutral
Litmus paper is used to identify the nature of a solution. They are available in two colours- red and blue.
The following table shows the colour of each litmus in different medium:

AcidicNeutralBasicRed LitmusRedRedBlueBlue LitmusRedBlueRed

When a blue litmus paper was put in all these test tubes, it turned red in test tube A and C. So, we can confirm that the samples in test tube A and C were acidic.

No change in the colour of red litmus was introduced in any of the test tubes. It can be noticed that both litmus papers didn't change its colour when kept in test tube B. This means that the solution in test tube B is neutral.


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