(1)turned yellow (2)turned violet(3)remained blue(4)turned red"">

A student prepared hydrogen chloride gas by treating sodium chloride with concentrated sulphuric acid in a test-tube. He held a strip of dry blue litmus paper in HCl gas coming out of the test-tube. The student observed that on coming in contact with HCl gas, the colour of blue litmus paper :
(1)turned yellow (2)turned violet
(3)remained blue(4)turned red

Correct answer: (4) turned red

Explanation: Litmus is an acid-base indicator. Acids turn blue litmus to red and bases turn red litmus to blue. As HCl is an acid, it will turn blue litmus to red.


Simply Easy Learning

Updated on: 10-Oct-2022


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