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प्रश्न
Which of the following forms a dirty green precipitate on reaction with caustic soda?
विकल्प
CuSO4
MgSO4
FeSO4
PbSO4
MCQ
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उत्तर
FeSO4
Explanation:
Ferrous sulphate (FeSO4) reacts with caustic soda (NaOH) to form ferrous hydroxide [Fe(OH)2], which is a dirty green precipitate.
\[\ce{FeSO4 + 2NaOH → Fe(OH)2↓ + Na2SO4}\]
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