(1) blue(2)green
(3)mustard(4) yellow
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A student adds a few drops of the universal indicator solution to a dilute solution of sodium hydrogencarbonate taken in a test-tube. Which of the following colour would he observe?

(1) blue(2)green
(3)mustard(4) yellow
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Correct answer: (1) blue 

Explanation: Universal indicator is used to check the pH of unknown solutions. Bases give blue colour, as sodium hydrogencarbonate is a base, so it will turn the colourless solution blue.

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Updated on: 10-Oct-2022

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