Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 43

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Weekly Quiz Competition

Question 1
1 / -0

Tincture of iodine is:

A
iodine in water

B
iodine in alcohol

C
iodine in sugar

D
iodine in kerosene

Solution

A solution in alcohol known as tincture of iodine. Iodine (solid) as the solute and alcohol (liquid) as the solvent.
Question 2
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Why alloys are always considered as mixtures?

A
They have a fixed composition

B
They shows the properties of its constituents

C
They can be seperated into its constituents by physical method

D
All of the above

Solution

Alloys are homologous mixtures of metals and cannot be separated into their constituents by physical methods. It is still considered a mixture because it shows the property of its constituents and can have variable composition.
Hence, the correct option is $$\text{B}$$.
Question 3
1 / -0

Among the following, identify the mixtures:

Soil, silver, tin, air

A
Soil

B
Silver, tin, air

C
Soil, air

D
All are mixtures

Solution

A mixture is a form of matter in which two or more elements or compounds are present in any proportion. Among the given substances, soil and air are a mixture of different substances. Silver and tin are elements, and so are pure substances.
Question 4
1 / -0

In brass,

A
zinc is the solvent and copper acts as solute.

B
copper acts as solvent and zinc acts as solute.

C
copper and zinc both act as solutes.

D
copper and zinc both act as solvents.

Solution

Brass is a solid solution (alloy) containing 70% copper and 30% zinc. The substance in larger quantity is the solvent and the one in lesser quantity is the solute. So, in brass, copper acts as solvent and zinc as solute.
Question 5
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Sugar obtained from dates and sugarcane are mixed. Then :

A
it will be a mixture.

B
it will be a pure substance.

C
it will be a colloid.

D
none of these.

Solution

According to the law of constant composition or definite proportions, irrespective of the source of a chemical compound it is always found to be made of the same elements combined in the same fixed proportion by mass. Thus, according to the above law, it will be a pure substance because sugar obtained by different sources like dates and sugarcane will have the same chemical composition.
Question 6
1 / -0

Kerosene is an example of :

A
homogeneous mixture

B
heterogeneous mixture

C
both A and B

D
none of the above

Solution

Kerosene is an example of a homogeneous mixture of many hydrocarbons. The chemical composition depends on its source, but it usually consists of about ten different hydrocarbons, each containing $$10$$ to $$16$$ carbon atoms per molecule. Properties and composition are uniform throughout.
Question 7
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Mark the incorrect statement.

A
The solute particle can be separated from the mixture by the process of filtration.

B
Solute particles settle down when left undisturbed.

C
Solution is unstable.

D
All of the above

Solution

The solute particle cannot be separated from the mixture by the process of filtration.
The solute particles do not settle down when left undisturbed, that is why the solution is stable.
Question 8
1 / -0

Why is sugar a compound?

A
Because the composition is not fixed

B
Because it's composition is fixed

C
Because it is crystalline in nature

D
Because it is soluble in water

Solution

Sugar is a compound because it's composition is fixed.
Question 9
1 / -0

Identify the heterogeneous mixture among the following:
Brass, common salt and sulphur, water and oil, aerated water, steel

A
Common salt and sulphur, Water and oil

B
Brass, Aerated water, Steel

C
Common salt and sulphur, Steel, Brass

D
All of the above

Solution
Question 10
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Why crystallisation is used as a method of obtaining pure $$CuSO_4$$ from impure sample?

A
Because $$CuSO_4$$ is a liquid

B
Because $$CuSO_4$$ is a crystalline solid

C
Because $$CuSO_4$$ is a gas

D
None of the above

Solution

Crystallisation is a method used to purify solids. $$CuSO_4$$ is a crystalline solid, hence it can be obtained as in a pure crystal form from impure samples using crystallisation.

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 43

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Is Matter Around Us Pure Test - 43

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Question 1

iodine in water

iodine in alcohol

iodine in sugar

iodine in kerosene

Solution

Question 2

They have a fixed composition

They shows the properties of its constituents

They can be seperated into its constituents by physical method

All of the above

Solution

Question 3

Soil

Silver, tin, air

Soil, air

All are mixtures

Solution

Question 4

zinc is the solvent and copper acts as solute.

copper acts as solvent and zinc acts as solute.

copper and zinc both act as solutes.

copper and zinc both act as solvents.

Solution

Question 5

it will be a mixture.

it will be a pure substance.

it will be a colloid.

none of these.

Solution

Question 6

homogeneous mixture

heterogeneous mixture

both A and B

none of the above

Solution

Question 7

The solute particle can be separated from the mixture by the process of filtration.

Solute particles settle down when left undisturbed.

Solution is unstable.

All of the above

Solution

Question 8

Because the composition is not fixed

Because it's composition is fixed

Because it is crystalline in nature

Because it is soluble in water

Solution

Question 9

Common salt and sulphur, Water and oil

Brass, Aerated water, Steel

Common salt and sulphur, Steel, Brass

All of the above

Solution

Question 10

Because $$CuSO_4$$ is a liquid

Because $$CuSO_4$$ is a crystalline solid

Because $$CuSO_4$$ is a gas

None of the above

Solution

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