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

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 B $C a O < C u O < H_{2} O < C O_{2}$
Non-metal oxides are acidic in character. They show acidic nature on reaction with water.
The non-metallic character and the same will be the order for acidity.

Non-metallic nature decreases down the group and increases down the period.

$C O_{2}$ - Acidic, $C u O$ -Weak base

$C a O$ - Basic, $H_{2} O$ - Acidic

Hence the non-metallic nature order: C>H>Cu>Ca

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