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Question

Consider the sequence of oxides: Na2O, SiO2, P4O10. Which factor decreases from Na2O to SiO2 to P4O10?
  1. Covalent character 
  2. Solubility in aqueous alkali. 
  3. pH when mixed with water 
  4. Melting point 


Solution

The correct option is C pH when mixed with water 
pH decreases from Na2O to SiO2 and then from SiO2 to P4O10 when these oxides are mixed with water. This is because Na2O is a basic oxide which reacts with water to give a strong base NaOH so that the pH of the solution is higher than both SiO2 and P4O10. Both SiO2 and P4O10 are acidic oxides but SiO2 is insoluble in while P4O10 reacts with water to give acid, H3PO4 and the pH of the solution is lower than that of SiO2 .

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