Identify the correct order of acidic strengths of ${C O}_{2}, C u O, C a O$ 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 D $C a O < C u O < H_{2} O < {C O}_{2}$
As we know,
Acidic character increases along the period and as oxidation state increases, acidic nature increases. Also, metal oxides are basic, non-metal oxides are acidic.
$C a O$ is more basic than $C u O$ .
Water ( $H_{2} O$ ) is amphoteric.
So order is $C a O < C u O < H_{2} O < {C O}_{2}$ .

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