Is Matter Around Us Pure Test - 32

The immiscible liquid does not dissolve in each other. Kerosene and water are immiscible liquid as they do not dissolve in each other.

Option A is correct.

Nitrogen and Hydrogen gets react and converted into ammonia their occurs a chemical change hence separation of nitrogen and hydrogen is most difficult.

Sublimation is a method in which a solid substance directly changes to the gas phase without changing into the liquid phase. 

Ammonium chloride is separated from common salt(sodium chloride) by sublimation. This happens because ammonium chloride is volatile in nature whereas common salt is non-volatile in nature. 

Hence when a mixture of ammonium chloride and common salt is heated, ammonium chloride changes its state from solid to vapour. The vapours of ammonium chloride are then condensed on a cold surface. The common salt(sodium chloride) is left behind.

Filteration will remove sand and glass from the mixture, as they won't pass through the filter paper. But sugar along with water will pass through the filter paper. Hence X will be sugar solution, Y would be glass and sand.
Solution X on distillation will separate water from the solid sugar, as water will boil off leaving sugar behind. Hence Z is sugar,

A pure substance has only one kind of atom or molecule and has a definite composition throughout. A refined substance is a substance without any impurity. But a mixture is neither pure nor a refined substance.

A mixture consists of different elements or compounds combined physically in an unknown ratio. The constituents of a mixture are not combined chemically, and so the mixture still shows all the properties of its constituents. A mixture doesn't have a definite boiling or freezing point. All of these properties of a mixture make it an impure substance. Thus option B is correct.

Filtration is a process used to separate out the solid components from a heterogeneous mixture. Solid components generally remain behind on the filter paper and the liquid is allowed to pass through.