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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
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-
Water is a universal solvent.
Sea water is a bad conductor of electricity.
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 \[\ce{H2O2}\]?
Give reasons: Ice floats on 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?
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.
How will you account for 104.5° bond angle in water?
The boiling point of water increases with ______ in pressure.
Pure water boils at ______ °C at one atmospheric 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.
What are the physical properties of pure 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 ______.
