Test: Matter In Our Surroundings - 1

When salt is dissolved in water, the particles of salt disappear in water. This happen because particles of salt get adjusted in the space b/w the particles of water.
Additionally, you will notice that there is no rise of water level take place when one or more teaspoons of salt is added in the glass of water, this is because salt particles get adjusted in the space b/w the particles of water and no rise in the water level comes in result.

During summer, water kept in an earthen pot becomes cool because of the phenomenon of evaporation. This water evaporates continuously and take the latent heat required for vaporization from the remaining water. In this way, the remaining water loses heat and gets cooled.

Because on increasing temperature, kinetic energy of the molecules increases, so the molecules present on the liquid surface would leave the surface quickly and go into the vapour state.
Diffusion and expansion of gases also increases as the molecules move more rapidly and try to occupy more space.

Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. Deposition is a thermodynamic process. The reverse of deposition is sublimation and hence sometimes deposition is called desublimation. 

During summer, water kept in an earthen pot becomes cool because of the phenomenon of evaporation. This water evaporates continuously and take the latent heat required for vaporization from the remaining water. In this way, the remaining water loses heat and gets cooled.

The correct order of boiling points of diethyl ether ,acetone and n- butyl alcohol in kelvin scale is 308k,329k and 391k which can be explained as (vT^oc + 273 = 7k)
boiling point of diethyl ether = 35^oc + 273 = 308k
boiling point acetone = 56^oc + 273 = 329k
boiling point of n-butyl alcohol = 118^oc + 273 = 391k

Normally, when liquids tend to reach their lower fixed point/freezing point they tend to expand which is the opposite of solids. If the bottle was left in the freezer for some time the bottle is going to explode.

If some hydrogen leaves the container then there will be lesser number of particles in the same volume so the distance between particles will increase.
If the volume of container is increased then the space available for same number of particles will increase and so the distance between them increases.

So option C is correct.

Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.

The particles of the solids are tightly packed there is no space in between the particles of solids so they can't move freely in a limited space.

So option D is correct