WILL GIVE BRAINLIEST TO WHO IS CORRECT - Which of the following is the conjugate base of H3PO4? A- HPO4^-2
B- PO4^-3
C- H2PO4^-
D- H4PO4^+

i believe it is 40–40–20%

explanation:

the ratio of the conjugate base to the acid required to attain the desired ph.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.