question_answer

The total number of diprotic acids among the following is

\[{{H}_{3}}P{{O}_{4}}\]	\[{{H}_{2}}S{{O}_{4}}\]	\[{{H}_{3}}P{{O}_{3}}\]	\[{{H}_{2}}C{{O}_{3}}\]	\[{{H}_{2}}{{S}_{2}}{{O}_{7}}\]
\[{{H}_{3}}B{{O}_{3}}\]	\[{{H}_{3}}P{{O}_{2}}\]	\[{{H}_{2}}Cr{{O}_{4}}\]	\[{{H}_{2}}S{{O}_{3}}\]

 

Answer:

6