What is the colour of the precipitate formed when solution of ferrous sulphate is mixed with sodium hydroxide solution?

Dirty green

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Dark blue

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Dark brown

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Dirty yellow

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Solution

The correct option is A
Dirty green

When sodium hydroxide is added to ferrous sulphate solution, a dirty green coloured precipitate (ppt) of ferrous hydroxide, Fe(OH)2, is formed.
This confirms that a chemical change, i.e., a chemical reaction has occurred.
FeSO₄(aq)+2NaOH(aq)→Na₂SO4(aq)+Fe(OH)₂(s)
Hence the correct answer is option A.

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