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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?
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:
\[\ce{CaO + H_2O -> Ca(OH)_2}\]
\[\ce{NaH + H_2O -> NaOH + H_2}\]
\[\ce{CaC_2 +H_2O -> C_2H_2 + Ca(OH)_2}\]
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संबंधित प्रश्न
Describe the usefulness of water in biosphere and biological systems.
Why is it said that-
Water is a universal solvent.
State whether the following statement is true or false.
The substance in which a solute dissolves is called a solvent.
Explain the various properties of water.
Why should a glass bottle completely filled with water never be kept in a freezer?
Define the following.
Freezing 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.
\[\ce{H2O2}\] is a better oxidising agent than water. Explain.
Explain why \[\ce{HCl}\] is a gas and \[\ce{HF}\] is a liquid.
How will you account for 104.5° bond angle in water?
The freezing point of water ______ with an increase in pressure.
Freezing of water will cause an ______ is the volume.
What is the taste of distilled water & boiled water?
The density of gold is 19 g/cm3. If 1.9 × 10−4 g of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 nm, the number of gold particles per mm3 of the sol will be ______ × 106.
The water having more dissolved O2 is ______.
