HNO3\mathrm{HNO}_{3}HNO3
HI\mathrm{HI}HI
K2CrO4\mathrm{K}_{2} \mathrm{CrO}_{4}K2CrO4
K2Cr2O7\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}K2Cr2O7