A monobasic acid " contains 1 replaceable H+ ion per molecule of the acid (if water soluble ) " What this means ?(same for Di basic acids and tri basic acids)
A monobasic acid means acid with only one Hydrogen to be donated during acid-base reaction. HF, HBr,etc are example for monobasic acids. The acid which dissociate on dissolving in water to produce one hydrogen ion per molecule of an acid. This is the answer for your first question. Dear student I'm supposed to answer more than one question at a time. Kindly ask next question another time.
Briefly I'll explain the question. Dibasic acid means there will be 2 replaceable hydrogen and for tribasic there will be 3 replaceable hydrogen. For details kindly ask it as another question.