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Which of the following is the most acidic in nature?
A
Cl2O7
B
Al2O3
C
Na2O
D
As2O3
Explanation
The normal oxide formed by the element of extreme left is the most basic (e.g., Na2O), whereas that formed by the element on extreme right is the most acidic (e.g., Cl2O7). Oxides of elements in the centre are amphoteric (e.g., Al2O3, As2O3) or neutral (e.g., CO, NO, N2O).
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