pBlock ElementsII 1 Question 31
31. The correct order of acidic strength is
(2000, 1M)
(a) $\mathrm{Cl} _{2} \mathrm{O} _{7}>\mathrm{SO} _{2}>\mathrm{P} _{4} \mathrm{O} _{10}$
(b) $\mathrm{CO} _{2}>\mathrm{N} _{2} \mathrm{O} _{5}>\mathrm{SO} _{3}$
(c) $\mathrm{Na} _{2} \mathrm{O}>\mathrm{MgO}>\mathrm{Al} _{2} \mathrm{O} _{3}$
(d) $\mathrm{K} _{2} \mathrm{O}>\mathrm{CaO}>\mathrm{MgO}$
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Answer:
Correct Answer: 31. (a)
Solution:
- Corresponding acids are $\mathrm{HClO} _{4}, \mathrm{H} _{2} \mathrm{SO} _{3}$ and $\mathrm{H} _{3} \mathrm{PO} _{4}$. Hence, the order of acidic strength is
$ \mathrm{Cl} _{2} \mathrm{O} _{7}>\mathrm{SO} _{2}>\mathrm{P} _{4} \mathrm{O} _{10} $
