Question

Which one of the following is dibasic acid?

• A. ${\mathrm{H}}_3{\mathrm{PO}}_4$
• B. ${\mathrm{H}}_3{\mathrm{BO}}_3$
• C. ${\mathrm{H}}_3{\mathrm{PO}}_3$
• D. ${\mathrm{H}}_3{\mathrm{AsO}}_4$

Answer 1

The correct option is C

${\mathrm{H}}_3{\mathrm{PO}}_3$

Explanation for the correct option:

(c ) ${\mathrm{H}}_3{\mathrm{PO}}_3$

• It has $2\mathrm{OH}$ groups.
• ${\mathrm{H}}_3{\mathrm{PO}}_3$ is a diabasic acid
• Hence this option is correct

Explanation for the incorrect options:

(a) ${\mathrm{H}}_3{\mathrm{PO}}_4$

• it has $3\mathrm{OH}$ groups.
• ${\mathrm{H}}_3{\mathrm{PO}}_4$ is a tribasic acid
• Hence this option is not correct

(b)${\mathrm{H}}_3{\mathrm{BO}}_3$

• it has $3\mathrm{OH}$ groups.
• ${\mathrm{H}}_3{\mathrm{BO}}_3$ is a tribasic acid
• Hence this option is not correct

(d) ${\mathrm{H}}_3{\mathrm{AsO}}_4$

• it has $3\mathrm{OH}$ groups.
• ${\mathrm{H}}_3{\mathrm{AsO}}_4$ is a tribasic acid
• Hence this option is not correct

Hence the correct option is (c ) ${\mathrm{H}}_3{\mathrm{PO}}_3$