Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 41

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Weekly Quiz Competition

Question 1
1 / -0

Calculate the concentration of solution which contains 5 g of salt dissolved in 100 g water.

A
5.26

B
9.52

C
4.54

D
4.76

Solution

Concentration of solution $$= \dfrac{\text{weight of salt} \times 100}{\text{weight of solution}}$$$$= \dfrac{5 \times 100}{5 + 100}$$$$= \dfrac{5 \times 100}{105} = 4.76$$%

Hence, the correct option is $$D$$
Question 2
1 / -0

Mark the correct statement
(I) A suspension is not visible to the naked eye.
(II) Fine solid particles remain suspended in the medium.
(III) Coarse lime particles are example of a suspension.

A
I, II, III

B
I, II

C
I, III

D
II, III

Solution

A suspension is a heterogeneous mixture in which solute particles do not dissolve but remain suspended throughout the bulk of medium. It is a mixture in which very fine particles (size $$10^{-7}$$ or more) of a solid are dispersed in any medium. Muddy pond water and smoke coming out a chimney of a factory, chalk-powder mixture and coarse lime particles in water are examples of suspension.
Question 3
1 / -0

Homogeneous solution of a solid into another solid is called a:

A
Solid solution

B
True solution

C
Both $$A $$ and $$B$$

D
None of these

Solution

Homogeneous solution of a solid into another solid is called a solid solution. Common metal alloys are solid solution.
Question 4
1 / -0

Mark the correct statement.

A
The size of solute particles in a true solution is less than 1 nm.

B
The size of solute particles in a true solution is between 1 and 1000 nm

C
The size of solute particles in a true solution is more than 1000 nm

D
None of the above

Solution

A solution in which the size of the particles is less than $$10^{-9}m$$ or $$1 \ nm$$ is called a true solution.
A solution having the size of particles between $$1$$ and $$1000 \ nm$$ is called a colloid.
A solution having the size of particles more than $$1000 \ nm$$ is called a suspension.
Question 5
1 / -0

A solution contains 10 g of a solute in 100 g of the solvent. Its concentration in terms of mass percentage is:

A
9.9

B
9.1

C
11.1

D
91

Solution

Mass of solute $$= 10 g$$
Mass of solution $$= Mass \ of \ solute + Mass\ of \ solvent$$
$$= 10\ g + 100\ g$$
$$= 110\ g$$
Mass % $$= \dfrac{\text{Mass of solute} \times 100}{\text{Mass of solution}}= \dfrac{10 \times 100}{110} = 9.09 = 9.1\%$$
Question 6
1 / -0

Gold used in making jewellery is a :

A
homogenous mixture

B
heterogenous mixture

C
pure substance

D
All of the above

Solution

Pure gold is too soft to be used and, so it is mixed with other metals such as silver, copper, nickel to make it harder. Thus, gold used in jewelry forms a uniform mixture with other metals.

Hence option A is correct.
Question 7
1 / -0

In suspension, the size of particle is:

A
$$10^{-7}$$ m or more

B
$$10^{-10}$$ m or more

C
$$10^{6}$$ m or less

D
$$10^{2}$$ m or more

Solution

A suspension is a heterogeneous mixture in which particles (size: $$\mathrm 10^{-7} m$$ or more) of a solid are dispersed in any medium.
Hence, option $$A$$ is correct.
Question 8
1 / -0

A heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of medium is known as a :

A
pure solution

B
suspension

C
colloid

D
none of the above

Solution

Suspensions are non-homogeneous systems. In suspension, solute particles do not dissolve but remain suspended throughout the bulk of the medium.
Question 9
1 / -0

Mark the correct statement
(a) Particles in a suspension have a tendency to settle down.
(b) Particles in a suspension can be seen with naked eyes.
(c) Particles in a suspension can't be seen under a simple microscope.

A
a, b, c

B
a, b

C
a, c

D
b, c

Solution

Suspension is a heterogeneous mixture in which the particles settle down when left standing for sometime. Particles of a suspension are sufficiently large and can be seen with naked eyes or under a simple microscope.

Hence, option $$B$$ is correct.
Question 10
1 / -0

100 ml of acetone is present in 600 ml of solution. Calculate its concentration.

A
14.2%

B
20%

C
12.5%

D
16.6%

Solution

% of concentration$$ = \dfrac{\text{Volume of acetone} \times 100}{\text{Volume of solution}}$$

$$= \dfrac{100 \times 100}{600} = 16.6$$%

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 41

Result

Is Matter Around Us Pure Test - 41

Score

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Rank

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SHARING IS CARING

Question 1

5.26

9.52

4.54

4.76

Solution

Question 2

I, II, III

I, II

I, III

II, III

Solution

Question 3

Solid solution

True solution

Both $$A $$ and $$B$$

None of these

Solution

Question 4

The size of solute particles in a true solution is less than 1 nm.

The size of solute particles in a true solution is between 1 and 1000 nm

The size of solute particles in a true solution is more than 1000 nm

None of the above

Solution

Question 5

9.9

9.1

11.1

91

Solution

Question 6

homogenous mixture

heterogenous mixture

pure substance

All of the above

Solution

Question 7

$$10^{-7}$$ m or more

$$10^{-10}$$ m or more

$$10^{6}$$ m or less

$$10^{2}$$ m or more

Solution

Question 8

pure solution

suspension

colloid

none of the above

Solution

Question 9

a, b, c

a, b

a, c

b, c

Solution

Question 10

14.2%

20%

12.5%

16.6%

Solution

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