UPSC CAPF (AC) 2024 Paper I · Question 13

Question 13 of the UPSC CAPF (AC) 2024 Paper I (4 August 2024). Try it first, then open the answer and explanation.

1. CAPF 2024 · P-I · Q13 · General Science · Chemistry

   Water is a good solvent for dissolving ionic compounds because

   1. It has a high specific heat
   2. It has no colour
   3. It has a high dipole moment
   4. It has a high boiling point

   आयनिक यौगिकों को घोलने के लिए जल अच्छा विलायक है क्योंकि

   1. इसमें उच्च विशिष्ट ऊष्मा होती है
   2. यह रंगहीन होता है
   3. इसमें उच्च द्विध्रुव आघूर्ण होता है
   4. इसका उच्च क्वथनांक होता है
   Show answer

   Answer: (3) It has a high dipole moment

   उत्तर: (3) इसमें उच्च द्विध्रुव आघूर्ण होता है

   A water molecule is bent and strongly polar (dipole moment about 1.85 D), so its partially negative oxygen end attracts cations and its partially positive hydrogen ends attract anions, pulling ions out of the crystal and surrounding them (hydration). This polarity also gives water a very high dielectric constant that weakens the attraction between ions; specific heat, colour and boiling point do not explain its dissolving power.

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