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Question

Identify the correct order of acidic strengths of CO2,CuO,CaO and H2O

A
CaO<CuO<H2O<CO2
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B
H2O<CuO<CaO<CO2
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C
CaO<H2O<CuO<CO2
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D
H2O<CO2<CaO<CuO
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Solution

The correct option is A CaO<CuO<H2O<CO2
We know that non - metallic oxides are acidic and metallic oxides are basic in nature.

Thus, the order of acidic character is CaO<CuO<H2O<CO2.

H2O is an amphoteric oxide and CO2 is a non metal oxide.
CaO and CuO 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 CuO is more acidic in nature compared to CaO

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