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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.

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Updated on: 10-Oct-2022

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