HCl\mathrm{HCl}HCl
H2SO4\mathrm{H}_{2} \mathrm{SO}_{4}H2SO4
HNO3\mathrm{HNO}_{3}HNO3
HO+H2O\mathrm{HO}+\mathrm{H}_{2} \mathrm{O}HO+H2O
Ans: a,b,c