Identify the correct order of acidic strengths of $C u O, C O_{2}, C a O$ and $H_{2} O$ :

C a O < C u O < H_{2} O < C O_{2}

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H_{2} O < C u O < C a O < C O_{2}

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C a O < H_{2} O < C u O < C O_{2}

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H_{2} O < C O_{2} < C a O < C u O

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Solution

The correct option is A $C a O < C u O < H_{2} O < C O_{2}$
Non-metallic oxides are acidic and metallic oxides are basic. An increase in metallic (i.e. electropositive) character increases the basic nature of the oxides and an increase in non-metallic (i.e. electronegative) character increases the acidic nature of oxide.
Hence, the correct order of acidic strengths is $C a O < C u O < H_{2} O < C O_{2}$ i.e., option (a) is correct.

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