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Question

Sulphurous acid turns _________ litmus paper __________.
  1. red, red
  2. blue, red
  3. red, blue
  4. blue, blue

A
blue, blue
B
blue, red
C
red, blue
D
red, red
Solution
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Sulphurous acid turns blue litmus red as it is the property of acids to turn blue litmus red.

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