Advertisements
Advertisements
प्रश्न
Give reasons: Lakes freeze from top towards bottom.
उत्तर
During winter, the temperature of lake water keeps on decreasing. Since cold water is heavier, it moves towards the bottom.
APPEARS IN
संबंधित प्रश्न
Among NH3, H2O and HF, which would you expect to have highest magnitude of hydrogen bonding and why?
Describe the usefulness of water in biosphere and biological systems.
Explain the various properties of water.
Why should a glass bottle completely filled with water never be kept in a freezer?
Which of the following equations depict the oxidising nature of \[\ce{H2O2}\]?
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?
Why does water show high boiling point as compared to hydrogen sulphide? Give reasons for your answer.
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 ______.
