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  4. The correct order of acidic strength is

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Q. The correct order of acidic strength is

IIT JEEIIT JEE 2000The p-Block Elements - Part2

Solution:

The species $Cl_2O_7$, $SO_2$ and $P_4O_{10}$ are the anhydrides of $HClO_4$, $H_2SO_3$ and $H_3PO_4$ respectively. The acid strength of these acids follows the order $HClO_4 > H_2SO_3 > H_3PO_4$. The corresponding anhydrides also follow the same order.