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प्रश्न
Give reasons: Lakes freeze from top towards bottom.
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उत्तर
During winter, the temperature of lake water keeps on decreasing. Since cold water is heavier, it moves towards the bottom.
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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-
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 picture in your own words.
Explain the various properties of water.
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.
Boiling point
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.
If same mass of liquid water and a piece of ice is taken, then why is the density of ice less than that of liquid water?
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?
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.
Which of the following ion is responsible for the temporary hardness of water?
The water having more dissolved O2 is ______.
