Question

Identify the correct order of acidic strength of $C{O}_2,CuO,CaO,$ and $H_{2}O$:

• A. $CaO<CuO<H_{2}O<C{O}_2$
• B. $H_{2}O<CuO<CaO<C{O}_2$
• C. $CaO<H_{2}O<CuO<C{O}_2$
• D. $H_{2}O<C{O}_2<CaO<CuO$

Answer 1

The correct option is A $CaO<CuO<H_{2}O<C{O}_2$

$C{O}_2$ is an acidic oxide, $H_{2}O$ is neutral, $CaO$ is strongly basic and $CuO$ is weakly basic. Therefore, the order of acid strength is: $CaO<CuO<H_{2}O<C{O}_2$