[" 56.A "0.010M" solution of maleic acid,a monoprotic "],[" organic acid is "14" per cent ionized.What is the "K_(a)],[" for maleic acid? "],[[" (a) "2.3times10^(-3)," (b) "2.3times10^(-4)],[" (c) "2.0times10^(-4)," (d) "2.0times10^(-6)]]