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

$CaO<CuO<H_{2}O<C{O}_2$

Clearly, water is neutral. CuO is mildly basic whereas CaO is much more basic than Copper (II) oxide.

$C{O}_2$ is acidic. Hence, $CaO<CuO<H_{2}O<C{O}_2$