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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
Among NH3, H2O and HF, which would you expect to have highest magnitude of hydrogen bonding and why?
Arrange the following:
CaH2, BeH2 and TiH2 in order of increasing electrical conductance.
Why is it said that-
There is no alternative to water for cleaning purposes.
State whether the following statement is true or false.
The substance in which a solute dissolves is called a solvent.
Why should a glass bottle completely filled with water never be kept in a freezer?
Define the following.
Boiling point
Which of the following equations depict the oxidising nature of \[\ce{H2O2}\]?
Some of the properties of water are described below. Which of them is/are not correct?
(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.
Give reasons: Ice floats on water.
Why does water show high boiling point as compared to hydrogen sulphide? Give reasons for your answer.
Write two reactions to explain amphoteric nature of water.
The boiling point of water increases with ______ in pressure.
The freezing point of water ______ with an increase in pressure.
Freezing of water will cause an ______ is the volume.
______ has the highest latent heat of fusion.
One gram of water requires ______ of heat to raise its temperature by l°C.
Water is circulated around the car engine using the ______ pump and the heat is absorbed.
What are the physical properties of pure water?
Which of the following ion is responsible for the temporary hardness of water?
