A pale green compound X reacts with caustic soda to form dirty green gelatinous precipitate along with sodium sulphate. Name this precipitate.
Ferrous hydroxide
When ferrous sulphate reacts with caustic soda, a dirty green gelatinous ppt. of ferrous hydroxide is formed along with sodium sulphate. Ferrous sulphate is pale green in colour.
FeSO4+2NaOH→Fe(OH)2+Na2SO4