Advertisements
Advertisements
प्रश्न
Give reasons: Lakes freeze from top towards bottom.
Advertisements
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
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 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.
Explain the various properties of water.
Define the following.
Freezing point
Define the following.
Boiling point
Which of the following equation depicts reducing nature of \[\ce{H2O2}\]?
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?
Explain why \[\ce{HCl}\] is a gas and \[\ce{HF}\] is a liquid.
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.
______ has the highest latent heat of fusion.
One gram of water requires ______ of heat to raise its temperature by l°C.
Which of the following ion is responsible for the temporary hardness of 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 ______.
