Question

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

Answer 1

Universal indicator is used to check the pH of unknown solutions. Acids give red color on the addition of universal indicator while bases give blue color. So sodium hydrogen carbonate is a base so it will turn the colorless solution to blue.

Hence the correct option is 1.