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A drop of a liquid sample was put on the pH paper. It was observed that the colour of the pH paper turned blue. The liquid sample is- lemon juice
- sodium bicarbonate solution
- distilled water
- hydrochloric acid
Correct Answer: (b) sodium bicarbonate solution
Explanation: The liquid sample is of sodium bicarbonate (NaHCO3) solution. It is a basic solution. And we know that a basic solution turns pH paper blue.
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