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 A $C a O < C u O < H_{2} O < C O_{2}$
We know that non - metallic oxides are acidic and metallic oxides are basic in nature.

Thus, the order of acidic character is $C a O < C u O < H_{2} O < C O_{2}$ .

$H_{2} O$ is an amphoteric oxide and $C O_{2}$ is a non metal oxide.
$C a O and C u O$ are metallic oxides.

Again basicity of oxides decreases as we move from left to right in a period of the periodic table, and conversely acidic character icreases. Thus $C u O$ is more acidic in nature compared to $C a O$

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