What is the colour of ferrous sulphate crystals?
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This SSC CGL Chemistry question asks: “What is the colour of ferrous sulphate crystals?” The correct answer is Green. Ferrous sulphate (FeSO4.7H2O) crystals are green in colour due to Fe2+ ions. Option A (“White”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option B (“Blue”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Red”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question.