Which of the following sulphates is not soluble in water?
Correct answer: D. Barium sulphate
- A. Calcium (Ca)
- B. Chromium (Cr)
- C. Both of the above
- D. Barium sulphate
Explanation
Among the given options, Barium sulphate (BaSO4) has the lowest solubility in water. This is because the strong electrostatic attraction between the large Ba²⁺ cations and the SO₄²⁻ anions makes it difficult for the compound to dissociate in water. In contrast, sodium sulphate (Na2SO4), potassium sulphate (K2SO4), and zinc sulphate (ZnSO4) are highly soluble in water because their ionic bonds are weaker and readily dissociate in the presence of water molecules.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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