Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Chemical Sciences Chemical Periodicity

Arrange the following oxides in order of increasing molecular (acidic) character :
SO3 , Cl2O7 , CaO, PbO2 

1
CaO < PbO2 <  SO3 < Cl2O7
2
 PbO2 < CaO  <  SO3 < Cl2O7
3
CaO  <  SO3 < Cl2O7 < PbO2
4
CaO < PbO2 < Cl2O7 <  SO3 
5
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