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प्रश्न
What properties of water make it useful as a solvent? What types of compound can it (i) dissolve, and (ii) hydrolyse?
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उत्तर
A high value of dielectric constants (78.39 C2/Nm2) and dipole moment make water a universal solvent.
Water is able to dissolve most ionic and covalent compounds. Ionic compounds dissolve in water because of the ion-dipole interaction, whereas covalent compounds form hydrogen bonding and dissolve in water.
Water can hydrolyze metallic and non-metallic oxides, hydrides, carbides, phosphides, nitrides and various other salts. During hydrolysis, H+ and OH– ions of water interact with the reacting molecule.
Some reactions are:
\[\ce{CaO + H_2O -> Ca(OH)_2}\]
\[\ce{NaH + H_2O -> NaOH + H_2}\]
\[\ce{CaC_2 +H_2O -> C_2H_2 + Ca(OH)_2}\]
संबंधित प्रश्न
Arrange the following:
CaH2, BeH2 and TiH2 in order of increasing electrical conductance.
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The substance in which a solute dissolves is called a solvent.
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(i) Water is known to be a universal solvent.
(ii) Hydrogen bonding is present to a large extent in liquid water.
(iii) There is no hydrogen bonding in the frozen state of water.
(iv) Frozen water is heavier than liquid water.
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The freezing point of water ______ with an increase in pressure.
Pure water boils at ______ °C at one atmospheric pressure.
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The water having more dissolved O2 is ______.
