Question : Acid changes the colour of blue litmus to ______.
Option 1: yellow
Option 2: red
Option 3: pink
Option 4: orange
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Correct Answer: red
Solution : The correct answer is red .
An acid changes the colour of blue litmus paper to red. Blue litmus paper is used as an indicator to test for the presence of acids. When an acidic substance comes into contact with blue litmus paper, it turns the paper from blue to red, indicating the acidic nature of the solution.
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