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Question

Which of the following gases on dissolution in water make the solution acidic?
  1. CO
  2. CO2
  3. SO3
  4. PH3

A
CO2
B
PH3
C
CO
D
SO3
Solution
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Reaction of the given compounds with water is as follows:
  1. CO+H2OCO2+H2
  2. CO2+H2OH2CO3 (Acid)
  3. SO3+H2OH2SO4) (Acid)
  4. when pure PH3 does not react with water

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