When any solution passess through a cation exchange resin that is in acidic form, H ion of the resin is replaced by cations of the solution. A solution containing 0.319 g of an isomer with molecular formula `CrCl_(3).6H_(2)O` is passed through a cation exchange resin in acidic form. The eluted solution requires 19 `cm^(3)` fo 0.125 N NaOH. The isomer is
A. triaquatichloro chromium (III) chloride trihydrate
B. hexaaqua chromium (III) chloride
C. pentaaquamonochloro chromium (III) chloride monohydrate
D. tetraaquadichloro chromium (III) chloride dihydrate.
