When sodium hydroxide solution is added to a freshly prepared solution of ferrous sulphate, a green precipitate of ferrous hydroxide is formed which on standing becomes brown because :

Ferric salts are unstable

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The mixture becomes dirty

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Ferrous hydroxide becomes ferric oxide

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Green ferrous hydroxide oxidises to brown ferric hydroxide

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Solution

The correct option is D Green ferrous hydroxide oxidises to brown ferric hydroxide
Ferrous hydroxide or iron(II) hydroxide has a greenish tinge with oxygen which is produced from iron(II) sulfate. If the solution contains oxygen and the iron is reduced the precipitate vary in color from green to reddish brown forming ferric hydroxide.

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