Phase change from gas to solid is called
Important Questions on Chemistry
Consider the following statements.
1. Evaporation is a surface phenomenon.
2. The rate of evaporation depends upon the surface area exposed to the atmosphere, the temperature, the humidity and the wind speed.
3. Evaporation causes cooling.
Which of the statements given above are correct about evaporation?
Consider the following statements
1. The forces of attraction between the particles are maximum in solids, intermediate in liquids and minimum in gases.
2. Sublimation is the change of solid state directly into gaseous state without going through liquid state and vice-versa.
Which of the statement(s) given above is/are correct?
Consider the following statements about plasma state
1. Plasma state consists of super energetic and super excited particles.
2. These particles are in the form of ionised gases.
3. The fluorescent tube and neon sign bulbs consist of plasma.
4. The sun and the stars glow because of the presence of plasma in them.
Which of the statement given above are correct?
Consider the following statements
1. The particles of nail polish remover pour on your palm, the particles gain energy from your palm or surroundings and evaporate causing the palm to feel cool.
2. After a hot sunny day, people sprinkle water on the roof or open ground because the large latent heat of vaporisation of water helps to cool the hot surface.
Which of the statement(s) given above is/are correct?
Assertion (A) All molecules of an ideal gas move with the same speed.
Reason (R) There is no attraction between the molecules in an ideal gas.
