Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 65

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following indicator can be used for the titration?

A
Phenolphthalein

B
Bromomethyl blue

C
Methyl orange

D
All of the above

Solution

Phenolphthalein, Bromomethyl blue & Methyl orange, all can be used as indicator in the titration.

Indicator changes colour at or near the equivalence point for the acid-base titration.

Phenolphthalein changes colour at a $$pH>7$$. So it is good for strong acid-strong base titration.

Methyl orange changes colour at a suitable $$pH$$. It is a good option for $$pH<7$$.

Bromomethyl blue is mostly used in applications that require measuring substance that would have a relatively neutral $$pH$$.
Question 2
1 / -0

Miscible liquids can be separated by ___________.

A
distillation process

B
fractional distillation

C
chromatography

D
separating funnel

Solution

A mixture of two miscible liquids can be separated by the process of fractional distillation. The separation of two liquids by fractional distillation depends on the difference in their boiling points.
Hence, option B is correct.
Question 3
1 / -0

Magnesium sulphate in water is a ______mixture.

A
solid-solid

B
homogeneous

C
heterogeneous

D
colloidal

Solution

Homogeneous mixture- it is a mixture of solids, liquids and gases that has the same proportions of its components in any sample,
Magnesium sulphate(Epsom salt) is also a homogeneous mixture.
Correct option is $$B$$.
Question 4
1 / -0

The maximum amount of solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon?

A
temperature

B
nature of solute

C
pressure

D
nature of solvent

Solution

Changes in pressure do not affect the solubility of solids and liquids that we may ignore because the reason that compressibility of solid and liquid substances is almost negligible or very less as compare to gases so to make them soluble by increasing the pressure in liquid is not as easy as it is for the gases in liquid.
Question 5
1 / -0

Identify the odd term out from the following:
milk, lemon juice, carbon, steel.

A
milk

B
lemon juice

C
carbon

D
steel

Solution

Here Carbon is the element while other are a mixture. Thus, here only carbon is a pure substance while others are impure substances.
Thus the correct answer is carbon.
Question 6
1 / -0

Smoke is an example of

A
gas dispersed in liquid.

B
gas dispersed in solid.

C
solid dispersed in gas.

D
solid dispersed in liquid.
Question 7
1 / -0

The size of colloidal particles ranges between:

A
$$10^{-7}-10^{-9}$$ cm

B
$$10^{-9}-10^{-11}$$ cm

C
$$10^{-5}-10^{-7}$$ cm

D
$$10^{-2}-10^{-3}$$ cm
Solution
- A colloid is a mixture in which one of the substances is split into very minute particles which are dispersed throughout a second substance. The substance which is dispersed is called a dispersed phase whereas the one in which the first substance is distributed is called a dispersion medium.
- The size of colloid particles generally ranges between 1 to 1000 nanometres i.e. $$10^{-5}$$ to $$10^{-7} cm$$.
Question 8
1 / -0

Vanishing creams are applied to the skin to give a smooth, thin covering. They do not vanish. They consist of a suspension of?

A
Protein in grease

B
Stearic acid in water

C
Clay in oil

D
Alum in wax

Solution

vanishing cream is a suspension of stearic acid in water and hence when it is applied to the skin , it results into a thin covering.
Question 9
1 / -0

Fog is an example of colloidal system of:

A
liquid in gas

B
gas in liquid

C
solid in gas

D
gas in solid
Solution
Hint:

A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance

Explanation:

Depending upon the type of dispersion medium and the dispersed phase, colloids can be categorized into different types.
- Among which when a liquid substance is dispersed in a gas medium, the combination is called aerosols. Some examples are fog, cloud, mist, etc.
- When gas is dispersed in the liquid medium it is called foam. Some of the examples are shaving cream, egg white.
- When a solid is dispersed in the gas medium it is also called an aerosol. Dust is an example of this kind of sol.
- When gas is dispersed in a solid medium, it is called solid foam. Smoke is an example of solid foam.
Final answer:

Therefore, the correct answer is option A.
Question 10
1 / -0

Which of the above diagram shows a suspension mixture?

A
I and II

B
I, II and III

C
Only III

D
II and IV

Solution

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 65

Result

Is Matter Around Us Pure Test - 65

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SHARING IS CARING

Question 1

Phenolphthalein

Bromomethyl blue

Methyl orange

All of the above

Solution

Question 2

distillation process

fractional distillation

chromatography

separating funnel

Solution

Question 3

solid-solid

homogeneous

heterogeneous

colloidal

Solution

Question 4

temperature

nature of solute

pressure

nature of solvent

Solution

Question 5

milk

lemon juice

carbon

steel

Solution

Question 6

gas dispersed in liquid.

gas dispersed in solid.

solid dispersed in gas.

solid dispersed in liquid.

Question 7

$$10^{-7}-10^{-9}$$ cm

$$10^{-9}-10^{-11}$$ cm

$$10^{-5}-10^{-7}$$ cm

$$10^{-2}-10^{-3}$$ cm

Solution

Question 8

Protein in grease

Stearic acid in water

Clay in oil

Alum in wax

Solution

Question 9

liquid in gas

gas in liquid

solid in gas

gas in solid

Solution

Question 10

I and II

I, II and III

Only III

II and IV

Solution

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