1.

Which of the following oxides is not a mixed anhydride?A. `NO_(2)`B. `P_(4)O_(8)`C. Both (1)and (2)D. `N_(2)O_(3)`

Answer» Correct Answer - 4
They are all acidic oxygen which dissolve in water to from oxyacids,hence they are also called acid anhydrides of corresponding acids.
`N_(2)O_(3)+H_(2)Orarr2HNO_(2)`
`2NO_(2)+H_(2)OrarrHNO_(2)+HNO_(3)`
`P_(4)O_(8)+H_(2)Orarr2H_(3)PO_(3)+2H_(3)PO_(4)`
Last two oxides which form two oxyacids are called mixed anhydrides.
Acidic oxides combines with bases to form salts and water but with basic oxides they form salts only.


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