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Which of the following oxides will be the least acidic?

1. As2O6
2. As2O10
3. P4O10
4. P4O6

Correct answer: P4O6

Solution

Acidity of oxides decreases as the oxidation state of the central atom decreases. P4O6 has the lowest oxidation state for phosphorus (+3), making it the least acidic among the given options.

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