IIT-JEE 2010 · Paper 2 · Chemistry Q7

ChemistryInteger+3Question 7 of 57

The total number of diprotic acids among the following is

$\ce{H3PO4}$ , $\ce{H2SO4}$ , $\ce{H3PO3}$ , $\ce{H2CO3}$ , $\ce{H2S2O7}$ , $\ce{H3BO3}$ , $\ce{H3PO2}$ , $\ce{H2CrO4}$ , $\ce{H2SO3}$

Your answer

Answer and worked solution

Official answer: 6

Count ionisable (O-H) hydrogens.

Diprotic: $\ce{H2SO4}$ , $\ce{H3PO3}$ (one H is on P), $\ce{H2CO3}$ , $\ce{H2S2O7}$ , $\ce{H2CrO4}$ , $\ce{H2SO3}$ : six.
Not diprotic: $\ce{H3PO4}$ (triprotic), $\ce{H3BO3}$ (monobasic Lewis acid), $\ce{H3PO2}$ (monoprotic; two H on P).

Answer: 6

Topics:Oxoacids Acids and bases

IIT-JEE 2010 · Paper 2, Chemistry question 7