Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 73

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Question 1
1 / -0

The copper sulphate solution during crystallization is filtered to:

A
separate copper

B
form crystals

C
separate impurities

D
All of the above

Solution

If the hot solution of copper sulphate contains insoluble impurities, it can be removed by the process of filtration.
For this process, a filter paper is placed cone in a funnel and wet the filter paper with a spray of water is fixed inside the funnel properly to separate impurities.
Option $$C$$ is correct.
Question 2
1 / -0

Arrange the following steps in the crystallisation of copper sulphate.
A. Dissolve it in a minimum amount of water.
B. Take some (approximately 5 g) impure sample of copper sulphate in a china dish.
C. Cover the solution with filter paper and leave it undisturbed at room temperature to cool slowly for a day.
D. Evaporate water from the copper sulphate solution so as to get a saturated solution.
E. Filter the impurities out.

A
A, C, B, D, E

B
B, D, A, C, E

C
B, A, D, E, C

D
B, A, E, D, C

Solution

The correct order of the steps for crystallisation of copper sulphate is B, A, D, E, C.
B. Take some (approximately 5 g) impure sample of copper sulphate in a china dish.
A. Dissolve it in a minimum amount of water.
D. Evaporate water from the copper sulphate solution to get a saturated solution.
E. Filter the impurities out.
C. Cover the solution with filter paper and leave it undisturbed at room temperature to cool slowly for a day.
You will obtain the crystals of copper sulphate in the china dish.
Question 3
1 / -0

The colloidal solutions of gold prepared by different methods have different colours. This is due to:

A
Difference in size of colloidal particles

B
Different concentration of gold

C
Presence of different types of foreign particles

D
The variable valency of gold
Question 4
1 / -0

What do you call a mixture where two substances are mixed in uniform composition?

A
Aerosol

B
Colloid

C
Suspension

D
None of the above

Solution

When two substances are mixed in uniform composition, they are called homogeneous mixtures. Aerosol, colloids, and suspension are heterogeneous mixtures.
Question 5
1 / -0

The suitable method is to separate the following components of the mixtures.
A) Two volatile liquids with appreciable differences in boiling points.
B) Two or more colored constituents soluble in some solvent.

A
A - Fractional distillation, B - decantation

B
A - Simple distillation, B - Evaporation

C
A - Simple distillation, B - Chromatography

D
A - Sublimation, B - Chromatography

E
A - Sublimation, B - Simple distillation

Solution

A) Two volatile liquids with an appreciable difference in boiling point are separated by a $$\text{simple distillation}$$ method. In this method, the liquid with a low boiling point is evaporated first. After condensation is collected in another vessel and by this way get separated from another liquid.
B) Two or more colored constituents are separated by the $$\text{chromatography}$$ method. In this method, the liquid which is more soluble in solvent moves faster and hence gets separated.

Hence, option $$C$$ is correct.
Question 6
1 / -0

Which of the following is made up of atoms of two different elements?

A
Ozone

B
Water

C
Glucose

D
Sulphuric acid

Solution

Ozone has the chemical formula $$O_3$$, that is made up of atoms of the same element (oxygen).
Water is made up of atoms of O and H and has the formula $$H_2O$$.
Glucose has the formula $$C_6H_{12}O_6$$, which means it made up of atoms of C, H and O.
Finally, sulphuric acid is made up of atoms of H, S and O and has the formula $$H_2SO_4$$.
So, the correct option is B.
Question 7
1 / -0

If a chemical is given to you, how would you know that it is pure?

A
By checking its melting point

B
By observing its colour

C
By testing

D
By smelling it
Question 8
1 / -0

Petrol and water can be separated by ............ because................

A
fractional distillation, they are immiscible liquids

B
simple distillation, their boiling points slightly differ.

C
separating funnel, they are immiscible liquids.

D
None of these

Solution

Separating funnel is used to separate immiscible liquids. Since petrol and water are immiscible, we can separate them using separating funnel.

Simple distillation is used to separate homogeneous mixtures that differ in their boiling points. Fractional distillation is based on the same principle, but it is generally used to separate mixtures whose boiling points differ by less than 25 K.
So, option C is correct.
Question 9
1 / -0

Mixture of $$MgCO_{3}$$ & $$NaHCO_{3}$$ on strong heating gives $$CO_{2}$$ & $$H_{2}O$$ in $$3 : 1$$ mole ratio. The weight $$\%$$ of $$NaHCO_{3}$$ present in the mixture is :

A
$$33.33\%$$

B
$$66.66\%$$

C
$$48.6\%$$

D
$$50\%$$

Solution
Question 10
1 / -0

A mixture of mustard oil and water forms

A
a Compound

B
a Homogeneous mixture

C
an Alloy

D
a Heterogeneous mixture

Solution

A mixture of mustard oil and water forms a heterogeneous mixture .when oil and water are combined they don't mix evenly, but instead form two separate layers hence,mixture of mustard oil and water form heterogeneous mixture

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 73

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Is Matter Around Us Pure Test - 73

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Question 1

separate copper

form crystals

separate impurities

All of the above

Solution

Question 2

A, C, B, D, E

B, D, A, C, E

B, A, D, E, C

B, A, E, D, C

Solution

Question 3

Difference in size of colloidal particles

Different concentration of gold

Presence of different types of foreign particles

The variable valency of gold

Question 4

Aerosol

Colloid

Suspension

None of the above

Solution

Question 5

A - Fractional distillation, B - decantation

A - Simple distillation, B - Evaporation

A - Simple distillation, B - Chromatography

A - Sublimation, B - Chromatography

A - Sublimation, B - Simple distillation

Solution

Question 6

Ozone

Water

Glucose

Sulphuric acid

Solution

Question 7

By checking its melting point

By observing its colour

By testing

By smelling it

Question 8

fractional distillation, they are immiscible liquids

simple distillation, their boiling points slightly differ.

separating funnel, they are immiscible liquids.

None of these

Solution

Question 9

$$33.33\%$$

$$66.66\%$$

$$48.6\%$$

$$50\%$$

Solution

Question 10

a Compound

a Homogeneous mixture

an Alloy

a Heterogeneous mixture

Solution

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