HNO2\mathrm{HNO}_{2}HNO2
HNO3\mathrm{HNO}_{3}HNO3
H2SO4\mathrm{H}_{2} \mathrm{SO}_{4}H2SO4
H2SO3\mathrm{H}_{2} \mathrm{SO}_{3}H2SO3