HCl acid is
Monobasic
Dibasic
Tribasic
All the above
HCl dissociates in an aqueous solution producing 1 H+ per molecule of the acid.
HCl+H2O⟶ H+ +Cl−
H+ +H2O⟶H3O+
And hence HCl is a monobasic acid.
Is dry hcl acid?