p-Block Elements-I - Result Question 12-1
12. Identify the correct order of acidic strength of $\mathrm{CO}_2, \mathrm{CuO}, \mathrm{CaO}, \mathrm{H}_2 \mathrm{O}$.
(2002, 3M)
(a) $\mathrm{CaO}<\mathrm{CuO}<\mathrm{H}_2 \mathrm{O}<\mathrm{CO}_2$
(b) $\mathrm{H}_2 \mathrm{O}<\mathrm{CuO}<\mathrm{CaO}<\mathrm{CO}_2$
(c) $\mathrm{CaO}<\mathrm{H}_2 \mathrm{O}<\mathrm{CuO}<\mathrm{CO}_2$
(d) $\mathrm{H}_2 \mathrm{O}<\mathrm{CO}_2<\mathrm{CaO}<\mathrm{CuO}$
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Answer:
Correct Answer: 12. (a)
Solution:
- $\mathrm{CO}_2$ is acidic oxide, $\mathrm{H}_2 \mathrm{O}$ is neutral, CaO is strongly basic and CuO is weakly basic. Therefore, order of acid strength is :
$ \mathrm{CaO}<\mathrm{CuO}<\mathrm{H}_2 \mathrm{O}<\mathrm{CO}_2 $
BETA
