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प्रश्न
Give reasons: Ice floats on water.
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उत्तर
Density of ice is less than that of water that is why it floats on the surface of water.
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संबंधित प्रश्न
Arrange the following:
CaH2, BeH2 and TiH2 in order of increasing electrical conductance.
What properties of water make it useful as a solvent? What types of compound can it (i) dissolve, and (ii) hydrolyse?
Why is the density of seawater more than that of rain 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 \[\ce{H2O2}\]?
Which of the following equation depicts reducing 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: Lakes freeze from top towards bottom.
\[\ce{H2O2}\] is a better oxidising agent than water. Explain.
Melting point, enthalpy of vapourisation and viscosity data of \[\ce{H2O}\] and \[\ce{D2O}\] is given below :
| \[\ce{H, O}\] | \[\ce{D2O}\] | |
| Melting point / K | 373.0 | 374.4 |
| Enthalpy of vapourisation at (373 K)/kJ mol–1 | 40.66 | 41.61 |
| Viscosity/centipoise | 0.8903 | 1.107 |
On the basis of this data explain in which of these liquids intermolecular forces are stronger?
Why does water show high boiling point as compared to hydrogen sulphide? Give reasons for your answer.
How will you account for 104.5° bond angle in water?
Write two reactions to explain amphoteric nature of water.
The freezing point of water ______ with an increase in pressure.
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.
Which of the following ion is responsible for the temporary hardness of water?
