The correct order of acidic strength is :

C l_{2} O_{7} > S O_{2} > P_{4} O_{10}

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C O_{2} > N_{2} O_{5} > S O_{3}

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N a_{2} O > M g O > A l_{2} O_{3}

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K_{2} O > C a O > M g O

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Solution

The correct option is A $C l_{2} O_{7} > S O_{2} > P_{4} O_{10}$
Non-metallic oxides are acidic and acidic character decreases with increase in metallic character.

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