Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.2 $$ \times $$ 10^$$-$$4 mol L^$$-$$1. Solubility product of Ag₂C₂O₄ is

The percentage of pyridine (C₅H₅N) that forms pyridinium ion (C₅H₅N⁺H) ina 0.10 M aqueous pyridine solution (K_b for C₅H₅N = 1.7 $$ \times $$ 10^$$-$$9) is

The solubility of AgCl_(s) with solubility product 1.6 $$ \times $$ 10^$$-$$10 in 0.1 M NaCl solution would be

Which of the following fluro-compounds is most likely to behave as a Lewis base ?