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Which of the following statements about acids is incorrect?

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They change the colour of red litmus to blue

They may change the colour of indicator

They have sour taste

They change the colour of blue litmus to red

answer is D.

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Detailed Solution

When litmus solution is exposed to an acidic pH, it turns red; when it is exposed to a basic pH, it turns blue.

Properties of acids are

Acids are sour to taste.
A litmus test is used to confirm the presence of an acid.
They are able to change the colour of litmus.
Acids are able to change the colour of the litmus paper from blue litmus to red when they are in contact with it.

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