Question 68 of 209

The correct order of acid strength is:

(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) ${\mathrm{K}}_2\mathrm{O}>\mathrm{CaO}>\mathrm{MgO}$