Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 54

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Question 1
1 / -0

Liquid ethanol can be separated from a mixture of ethanol and water by:

A
chromatography

B
fractional distillation

C
centrifugation

D
all of the above

Solution

Fractional distillation is a method for separating a liquid from a mixture of two or more liquids when the difference in their boiling points is less than 25 K.

Boiling point of water is 373.2 K while that of ethanol is 351.52 K. Since the difference between these two boiling points is less than 25 K, fractional distillation is the correct method for separating ethanol from the mixture of ethanol and water.
Question 2
1 / -0

What is the meaning of 10% solution of $$\displaystyle NaCl$$?

A
10 g $$\displaystyle NaCl$$ in 100 grams of solution

B
58.5 g $$\displaystyle NaCl$$ in 100 grams of solution

C
94 g $$\displaystyle NaCl$$ in 100 grams of solution

D
5.85 g of $$\displaystyle { H }_{ 2 }O$$ in 100 grams of solution

Solution

10% solution of NaCl means 10 g NaCl in 100 grams of solution.

Mass by mass percentage of a solution is the ratio of the mass of solute to the total mass of solution multiplied by 100.

Mass by mass percentage $$\displaystyle = \dfrac {\text {10 g NaCl}}{\text {100 g solution}} \times 100 = 10$$%

Therefore, option A is correct.
Question 3
1 / -0

Distillate formed after distillation is:

A
a diluted solution

B
may contain impurities

C
a condensed solution

D
a concentrated solution

Solution

Distillate formed after distillation is a condensed solution.
During distillation, the distillation flask is heated, when constant temperature is achieved, the liquid is converted into its vapour which passes through the side tube into the condenser. In the condenser, the vapour gets condensed into liquid which is collected in the receiver as the distillate. The distillate is a pure liquid. The impurities remain in the distillation flask.
Question 4
1 / -0

In fractionating column of fractional distillation, higher___________ in column .

A
temperature becomes lower

B
temperature becomes higher

C
minimum absorption is carried out

D
risks of sublimation exists

Solution

In the fractionating column of fractional distillation, higher temperature becomes lower in column temperature becomes lower.

During distillation, hot vapors pass through the fractionating column. They pass their heat energy to the walls of the fractionating column and condense. This in turn heats up the column. More vapors pass through the lower end of the column than through the upper end of the column. Thus at the lower end of the fractionating column, the temperature is higher than at the higher end of the fractionating column.
Question 5
1 / -0

Which of the following will form a stable solution -
Solute Solvent
I. ethanol water
II. salt water
III. oil vinegar
IV. oil gasoline

A
I only

B
I and II only

C
III only

D
I, II, and III only

E
I, II, and IV only

Solution

Like dissolves like which means that if the solute is of the same nature as the solvent then it'll get dissolved and form a stable solution and if not then it'll not dissolve and not form a stable solution.

Hence, the following will form a stable solution.
I.   ethanol and water (both are ionic)
II.   salt and water (both are ionic)
IV.   oil and gasoline (both are non-ionic)

The following will not form a stable solution.
III.   oil and vinegar  (oil is non-ionic but vinegar is ionic)
Question 6
1 / -0

How many mL are in 3.4L?

A
0.0034 mL

B
3,400 mL

C
0.34 mL

D
3.4 mL

E
3,400,000 mL

Solution

$$1 L = 1000\ mL $$

$$3.4 L = 3.4 \times 1000 = 3,400\ mL$$

Hence the correct option is $$B$$.
Question 7
1 / -0

Which is present in greater quantity in solution?

A
Solute

B
Solvent

C
Solubility

D
both A and B

E
Solvation

Solution

The solvent present in a greater amount in a solution. A solution is a final product once a solute is dissolved within a solvent. A very important example of a solution used in hospitals is saline used to replenish lost fluids. Saline is made up of salt and water. Salt is dissolved into the water, therefore salt is the solute and water is the solvent.
Question 8
1 / -0

Crude oil can be fractionally distillated to produce:

A
diesel

B
petrol

C
paraffin

D
All of the above

Solution

Crude oil is converted into petroleum products in a number of steps in refineries. The first is atmospheric distillation at $$350-400^oC$$. After separation, the next step is conversion at a temperature of 500°C. Processes include catalytic cracking and hydro-cracking, which “crack” the molecules that are still too heavy, producing gas, petrol, diesel, paraffin and other petroleum products.
Question 9
1 / -0

Which mixture is correctly paired with a method for separation of the mixture?

A
Oil and water - filter paper

B
Salt water - crystallisation

C
Sand and water - funnel

D
Sand and sugar - tweezers

E
Iron and sand - filter paper

Solution

Salt can be separated from salt and water mixture by crystallisation, which involves heating the mixture and then letting it cool. Pure salt crystallises out.

Oil and water need to be separated by using a separating funnel. Sand and water can be separated by filtration. Sand and sugar need more than two methods of separation. Iron and sand can be separated using magnetic separation.
Question 10
1 / -0

the separation of different gases from air, are separated from by which of the following?

A
sedimentation

B
Sublimation

C
Filtration

D
Distillation

Solution

To separate a mixture of two or more miscible liquids for which the difference in boiling points is less than 25 K, a fractional distillation process is used, for example, for the separation of different gases from the air.

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	Solute	Solvent
I.	ethanol	water
II.	salt	water
III.	oil	vinegar
IV.	oil	gasoline

Is Matter Around Us Pure Test - 54

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Is Matter Around Us Pure Test - 54

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Question 1

chromatography

fractional distillation

centrifugation

all of the above

Solution

Question 2

10 g $$\displaystyle NaCl$$ in 100 grams of solution

58.5 g $$\displaystyle NaCl$$ in 100 grams of solution

94 g $$\displaystyle NaCl$$ in 100 grams of solution

5.85 g of $$\displaystyle { H }_{ 2 }O$$ in 100 grams of solution

Solution

Question 3

a diluted solution

may contain impurities

a condensed solution

a concentrated solution

Solution

Question 4

temperature becomes lower

temperature becomes higher

minimum absorption is carried out

risks of sublimation exists

Solution

Question 5

I only

I and II only

III only

I, II, and III only

I, II, and IV only

Solution

Question 6

0.0034 mL

3,400 mL

0.34 mL

3.4 mL

3,400,000 mL

Solution

Question 7

Solute

Solvent

Solubility

both A and B

Solvation

Solution

Question 8

diesel

petrol

paraffin

All of the above

Solution

Question 9

Oil and water - filter paper

Salt water - crystallisation

Sand and water - funnel

Sand and sugar - tweezers

Iron and sand - filter paper

Solution

Question 10

sedimentation

Sublimation

Filtration

Distillation

Solution

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