Olympiad Test: Separation of Substances
20 Questions MCQ Test Science Class 6 | Olympiad Test: Separation of Substances
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X is a separation technique based on the difference in weights of the solids in a solid-solid mixture. What is X?
X is winnowing, a process which uses the difference in weights of solids in a solid- solid mixture for separating the components.
Steel is uniform in its composition. Hence, it is a homogeneous mixture of solids.
Vinegar is a solution of acetic acid in water. What kind of mixture is vinegar?
Acetic acid and water are miscible liquids.
Which of the following separation techniques is used for separating a mixture of two or more gases?
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.
Direction: The following flow chart which gives the techniques a student adopted to separate the constituents of a mixture.
What could the mixture be?
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.
The following flow chart which gives the techniques a student adopted to separate the constituents of a mixture.
What could R be?
R should be a substance which is soluble in water i.e., sugar.
The following flow chart which gives the techniques a student adopted to separate the constituents of a mixture.
What is substance Q?
Q should be a substance that is solid and insoluble in water i.e., chalk powder.
How are grain seeds removed from their stalks?
By threshing (i.e., beating the stalks on a slab) grain seeds are separated from their stalks.
A compound is a pure substance containing only one kind of molecules.
A Identify the mixture from the following.
Air is mixture of many gases and water vapours. The components of air are not chemically combined with one another.
Identify the compound from the following.
A compound is a substance which contains only one type of molecules i.e. CO2
An element is a substance which is made up of only one type of atoms. Oxygen (O2) is diatomic in nature.
Which of the following is an example of a solid-in-gas mixture?
Minute solid particles float along with vapours (fumes) in the smoke. Hence, smoke is a solid-in-gas mixture.
Which of the following does NOT belong to the group formed by the others?
Water is a pure substance and all others are solid-in-solid and solid-in-liquid mixtures.
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
Which of the following statements about a mixture is TRUE?
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.
The components of a mixture are not chemically bound. Therefore, they retain their individual properties.
What is the process by which a gas changes into a liquid?
When a gas changes into a liquid, the process is known as condensation.
A mixture of solid-in-solid is called an alloy.
What kind of mixtures are aerated drinks?
Aerated drinks are a mixture of carbon dioxide and water i.e. gas in liquid.
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