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Question

the correct increasing order of acidity of CO2,  H2O and H2O2 is:
  1. H2O<H2O2<CO2
  2. CO2<H2O2>H2O
  3. H2O<H2O2>CO2
  4. H2O2>CO2>H2O


Solution

The correct option is A H2O<H2O2<CO2
CO2 is stronger acid than H2O2 since it liberates H2O2  from BaO2.
Also, water is a weaker acid than H2O2

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