MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions
Which compound is soluble in water?
Think it through first, then pick an option.
- a K₂SO₄
- b CaSO₄
- c Fe(OH)₂
- d BaSO₄
Answer and explanation
Correct answer: a K₂SO₄
Potassium salts dissolve in water, so K₂SO₄ stays dissolved.
Why the other options are wrong
- b CaSO₄: CaSO₄ is only slightly soluble; it is not called soluble.
- c Fe(OH)₂: Fe(OH)₂ is insoluble: it falls as a green precipitate when NaOH meets FeSO₄.
- d BaSO₄: BaSO₄ is insoluble: it precipitates from Na₂SO₄ + BaCl₂.
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