[" 56.Hydrogen ion concentration in mol/L in a "],[" solution of "pH=5.4" will be "quad [AlEEE2005]],[[" (a) "3.98times10^(-6)," (b) "3.68times10^(-6)],[" (c) "3.88times10^(6)," (d) "3.98times10^(8)]]