Question

Which of the following compounds are monobasic proton donor acids in water?
A)- $H_3PO_2$, $H_3BO_3$
B)- $H_3BO_3$, $H_3PO_3$
C)- $H_3PO_3$, $H_3PO_2$
D)- $H_3PO_2$, $HCLO_4$

Answer 1

Hint :If it gives only one proton, then it is monobasic. Complete answer: - H3BO3 is also known as Boric acid or Orthoboric acid. It exists in the form of colourless crystals or a white powder that dissolves in water.

Complete Step By Step Answer:
(a) ${H_3}P{O_2} \to \,Monobasic\,proton\,donor \\   {H_3}P{O_3} \to Dibasic$
(b) ${H_3}B{O_3} \to Monobasic\,Lewis\,acid \\   {H_3}P{O_2} \to Monobasic\,proton\,donor$
(c) $HCl{O_3} \to Monobasic\,proton\,donor \\   {H_3}B{O_3} \to Monobasic\,Lewis\,acid$
${H_3}PO3,{H_3}P{O_2}$ , are monoprotic, diprotic and triprotic acids, respectively, and they are about equal strong acids. $HCl{O_2},HCl{O_3},HCl{O_4}$ are all monoprotic acids, but $HCl{O_2}$ is a weaker acid than $HCl{O_3}$ which is weaker than $HCl{O_4}$ .

Note :
A monobasic or monoprotic acid, able to donate one proton per molecule. A monobasic salt, with one hydrogen atom, with respect to the parent acid, replaced by cations Monobasic, or Monotypic taxon, a taxonomic group (taxon) that contains only one immediately subordinate taxon.