Which of the following would have the highest pH?

H N_{3}

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C_{2} H_{5} O H

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M g O

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S O_{2}

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C O_{2}

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Solution

The correct option is C $M g O$
$p H$ highest $\Rightarrow$ strong basic
Metal oxides are more basic than non-metal oxide
$M g O + H_{2} O \to M g {(O H)}_{2}      \Rightarrow ({M g}^{2 +} + {2 O H}^{-})$
most basic

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