Question

For each of the chemical descriptions select from the response list the compound or ion which best fits the description. Responses may be used more than once or need not be used at all. 

(a) H₃PO₄ 

(b) H₂PO₄^– 

(c) HPO₄^2– 

(d) PO₄^3–

(1) Conjugate base of H₃PO₄

(2) Conjugate acid of HPO₄^2–

(3) Will form a buffer with PO₄^3–

(4) Reacts with H₃O+ to form HPO₄ ^2–

(5) Reacts with OH– to form HPO₄^2– 

Answer 1

The Correct option is   

(1) b

(2) b

(3) c

(4) d

(5) b