DIRECTIONS (Q. 3). Read the following passage carefully and give the answer.
A teacher of Class VII demonstrates the following activity in her class
“The teacher takes a small amount of sulphur in a spoon and burns it. She then puts the spoon into a tumbler with a lid to ensure that the gas produced does not escape. After a few minutes, she adds water to the tumbler.”
 What happens if blue and red litmus papers are put into the tumbler?
  • 1

    Blue litmus turns red

  • 2

    No change in both

  • 3

    Blue litmus remains blue

  • 4

    Red litmus turns blue

Answer:- 1
Explanation:-

When sulphur is burned in air, it forms sulphur dioxide gas.When sulphur dioxide reacts with water, it forms sulphurous acid which turns blue litmus red.

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