Answer:
Tetrahedral molecules are normally spy hybridized.
Explanation:
Given is the ratio of conjugate base and conjugate acid of phosphoric acid. pH of a substance is the concentration of the hydrogen ions in its solution and higher this concentration lower is the value of pH.
pKa value is a measure of the strength of acid, it is the negative log of acid dissociation constant Ka.
It is a poly atomic anion because it has more than one atom and a negative charge