Advertisements
Advertisements
प्रश्न
The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume. If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume.
- Name the substances (i) X (ii) Y and (iii) Z.
- What is the process of conversion of X into Y known as ?
- At which temperature X gets converted into Y ?
- What is the process of conversion of X into Z known as ?
- At which temperature X gets converted into Z ?
Advertisements
उत्तर
- the substances X, Y and Z are water, ice and steam, respectively.
- The process of conversion of X into Y is known as freezing
- At 0°C X is converted to Y.
- Boiling or vaporisation is the name of the process of conversion of X to Z.
- At 100°C X gets converted to Z.
APPEARS IN
संबंधित प्रश्न
Comment upon the following:
rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.
Give reasons:
We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert.
Give a reason for the following observation.
Naphthalene balls disappear with time without leaving any solid.
Name two gases which are supplied in compressed form in homes and hospitals.
Write the full forms of the following
- LPG
- CNG
If the fish is being fried in a neighbouring home, we can smell it sitting in our own home. Name the process which brings this smell to us.
A girl is cooking some food in the kitchen. The smell of food being cooked soon reaches her brother's room. Explain how the smell could have reached her brother's room.
A substance has neither a fixed shape nor a fixed volume. State whether it is a solid, a liquid or a gas.
Comment upon the following:-
fluidity
 |
|
| Fig. I | Fig. II |
In figure-I, an air column of length ℓ1 is entrapped by a column of Hg of length 8 cm. In figure-II length of same air column at the same temperature is ℓ2. The `ℓ_1/ℓ_2` is:
(1 atm = 76 cm of Hg)
