A student adds a few drops of the universal indicator to a solution of dilute hydrochloric acid in the way shown here. He would observe that the colour of the solution changes form colourless to:

(1) red
(2) yellow
(3) violet
(4) green

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Correct answer: (1) red

Explanation: Universal indicator is used to test the pH of unknown solutions. Acids give red color with universal indicator. 

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Updated on: 10-Oct-2022

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