Stability of ferrous ions and iron(II) hydroxide in acidic conditions
The stability of iron(II) hydroxide J. Chem. Educ., 1957, vol. 34 pages 178-179 shows that the book isn't entirely correct.  


  ...Iron(II)
  hydroxide would thus appear to be unstable in neutral
  solutions and to possess increasing stability as the
  basicity of the medium increases.
  
  The foregoing reasoning led to the attempt to prepare
  iron(II) hydroxide from the chloride under such
  conditions that the hydroxyl ion concentration was not
  allowed to fall below approximately one molal until the chloride ion had been removed. The hydroxide was precipitated from strongly basic solution by the addition of dilute iron(II) chloride to a saturated solution of
  sodium hydroxide in an air-free system with vigorous
  stirring. The precipitate was repeatedly washed with
  molal sodium hydroxide (oxygen and carbonate-free)
  until a test for chloride ion with silver nitrate could
  no longer he obtained. Five additional one-liter washings with normal base completed the preparation of the
  iron(II) hydroxide used for the solubility studies.
  This technique led to the formation of a coarse-grained
  precipitate, white when viewed by reflected light and
  slightly greenish tinged by transmitted light. Dilutions
  of the material were made to one-tenth molal base
  without evidence of darkening when maintained under
  an oxygen-free atmosphere.