Select all of the correct statements about the relative acid strengths of pairs of acids from the choices below. HCl is a stronger acid than H2S because Cl is more electronegative than S. NH3 is a stronger acid than PH3 because N is more electronegative than P. H3PO4 is a stronger acid than H2PO4- because it has more acidic H atoms. PH3 is a stronger acid than NH3 because P atoms are larger than N atoms. HCl is a stronger acid than HI because Cl is more electronegative than I. H2Se is a stronger acid than H2S because Se atoms are larger than S atoms.