Pure Substances and Mixtures; Separation of Mixtures Test - 2

Hand picking can be used for separation of slightly larger sized impurities.

Threshing machine is called thresher.

Cream can be separated from milk by filtration process. Churning is used for separation of butter from milk.

Oil and water form different layers on standing and they can be separated by decantation (Oil being lighter forms upper layer).

X is winnowing, a process which uses the difference in weights of solids in a solid- solid mixture for separating the components.

Winnowing is used to separate heavier and lighter components of a mixture by wind.

Thresher; it is used in threshing.

A substance is pure if its composition is constant throughout and is made up of only one type of particles i.e. atoms or molecules.

Filtration method is used for the removal of tea leaves from brew.

Acetic acid and water are miscible liquids.

To separate salt from salt solution (salt and water mixture) we use the process of evaporation.

When a gas changes into a liquid, the process is known as condensation.

In decantation process, water (along with dirt) is removed.

Minute solid particles float along with vapours (fumes) in the smoke. Hence, smoke is a solid-in-gas mixture.

The components of a mixture are not chemically bound. Therefore, they retain their individual properties.

Paneer is separated by filtering using a strainer or fine cloth.

It is the process of filtration. In it cloth acts as a filter.

By threshing (i.e., beating the stalks on a slab) grain seeds are separated from their stalks.

Pulp from juice is separated by filtration method.

Steel is uniform in its composition. Hence, it is a homogeneous mixture of solids.

An element is a substance which is made up of only one type of atoms. Oxygen (O₂) is diatomic in nature.

A saturated solution can dissolve more solute at a higher temperature it cannot dissolve more solute at given temperature.

Air is mixture. The components of air are not chemically combined with one another.

Water is a pure substance and all others are solid-in-solid and solid-in-liquid mixtures.

In a mixture, the constituent substances are mixed only physically but not combined chemically. A mixture is not a pure substance as its constituents retain their properties. So, a mixture can be either homogeneous or heterogeneous.

Aerated drinks are a mixture of carbon dioxide and water i.e. gas in liquid.

The process that is used to separate grains from stalks is threshing.

through figure-of-eight movements of the head, forming a structure called the cocoon.

Salt is obtained from sea water by the process of Evaporation.

Liquification involves condensation of gases. The gas which condenses first gets separated. In all the other options, atleast one of the constituents is a solid.

In winnowing, the components of a mixture are separated by wind or blowing air.

A compound is a pure substance containing only one kind of molecules.

A compound is a substance which contains only one type of molecules i.e. CO₂.

The seeds of grain being heavier will forma heap near the platform of winnowing.

When the heavier insoluble component of substance settles at the bottom the process is called sedimentation.

It is a mixture of chalk powder, sugar and water. The chalk powder gets separated from sugar water by filtration. Later, sugar from sugar water is separated by distillation.

R should be a substance which is soluble in water i.e., sugar.

Q should be a substance that is solid and insoluble in water i.e., chalk powder.

A mixture of solid-in-solid is called an alloy.

We allow the suspended soil particles to settle down (sedimentation) and then remove clear water using the process of decantation.