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प्रश्न
H2O is liquid while H2S is gas at room temperature. Explain.
उत्तर
1) Due to greater electronegativity of O than S, H2O undergoes extensive intermolecular H-bonding. As a result, H2O exists as an associated molecule in which each O is tetrahedrally surrounded by four water molecules. Quite a larger amount of energy is required to break these H-bonds. Therefore, H2O is a liquid at room temperature.
2) In contrast, H2S does not undergo H-bonding. It exists as discrete molecules which are held together by weak van der Waals forces of attraction. To break these forces of attraction, only a small amount of energy is required. Therefore, H2S is a gas at room temperature.
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संबंधित प्रश्न
Which of the following compounds contain S = O as well as S = S bonds?
(A) Sulphuric acid
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| Column I | Column II |
| (A) \[\ce{Pb3O4}\] | (1) Neutral oxide |
| (B) \[\ce{N2O}\] | (2) Acidic oxide |
| (C) \[\ce{Mn2O7}\] | (3) Basic oxide |
| (D) \[\ce{Bi2O3}\] | (4) Mixed oxide |
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