C3 Separating Techniques Homework 1 Quiz

1. Question

A mixture of sulfur and iron filings needs to be separated. The solubilities of sulfur and iron filings in water and carbon disulfide are shown in the table below.

What are the possible methods of separating the sulfur and iron filings?

A
B
C
D

2. Question

(2018/SNGS/FE/1) What is the most appropriate sequence of method(s) that can be carried out to separate pure, dry copper(II) oxide from a mixture of zinc oxide and copper(II) oxide?

add excess dilute acid, filter, crystallise
add excess dilute sodium hydroxide, filter, rinse residue with distilled water, dry
add excess water, filter, heat filtrate to dryness
add excess water, filter, crystallise

3. Question

(2018/S3HC/Set A) Which of the following mixture can be separated into its components by adding water, stirring filtering?

Calcium nitrate and sodium sulfate
Copper(II) sulfate and iron(II) nitrate
Sodium nitrate and calcium carbonate
Magnesium oxide and calcium carbonate

4. Question

(2012/S3RP/MYCT) Which of the following processes is most suitable for separating a solid mixture of zinc nitrate and calcium carbonate?

A
B
C
D

5. Question

A bottle of solid copper(II) oxide has been contaminated with some solid sodium chloride. How can sodium chloride be removed from the copper(II) oxide?

Place the mixture in a separating funnel
Heat the mixture and allow it to cool
Add dilute acid to the mixture and filter
Add aqueous silver nitrate to the mixture
Add water to the mixture and filter

6. Question

(2018/NYGH/S3/IP/FE/P1/4) Lead (II) sulfate is soluble in hot water but almost insoluble in cold water. Which of the following methods is most suitable for obtaining a pure sample of lead (II) sulfate crystals from a flask containing a hot aqueous solution of lead (II) sulfate and sodium sulfate?

cool the mixture to room temperature, filter and collect the residue
heat the mixture and collect the substance which boils and condense it
cool the mixture, filter and evaporate the filtrate
heat the mixture and collect the substance in the flask

7. Question

(2018/RP/S3/IP/FE/P1/4) The reaction scheme shows how hydrated copper (II) sulfate, CuSO₄ 5H₂O, changes when heated.

A little water was accidentally spilled into a dish containing hydrated copper (II) sulfate.

What could be done to remove the water, leaving pure, dry CuSO₄ 5H₂O?

Heat the dish using a Bunsen burner until constant mass is obtained.
Heat the dish using Bunsen burner until the sample turns white.
Leave the dish on a bench top at room temperature.
Leave the dish on a boiling water bath.

8. Question

Gore-tex fabric is a type of waterproof and breathable material often used in outdoor sportswear. It is able to block out rainwater and wind. While allowing water vapour from body perspiration to escape. Its structure consists of a few layers of porous membranes, each with pores of different sizes. Which of the following explains how the fabric can be water-resistant and yet breathable?

The pores in the layers are smaller than liquid water droplets or water vapour molecules
The pores in the layers are smaller than liquid water droplets or water vapour molecules
The pores in one layer are smaller than liquid water droplets, while the pores in other layers are bigger than water vapour molecules
The pores in one layer are larger than liquid water droplets, while the pores in other layers are smaller than water vapour molecules

9. Question

(2012/S3RP/MYCT) Which of the following processes is most suitable for separating a solid mixture of zinc nitrate and calcium carbonate?

A
B
C
D

10. Question

Which one of the following is suitable for extracting the water from a solution containing sugar?

Chromatography
Distillation
Filtration
Crystallization

11. Question

(2013/VS/S3/IP/CA1/5) A student tried to separate seawater by distillation using the apparatus shown below.

What are the errors made by the student?

I and II only
II and III only
III and IV only
II and IV only

12. Question

(2018/CGSS/FE/1) Which mixtures of substances can be separated using the apparatus below?

a liquid with a solid dissolved in it
a liquid and an insoluble solid
two liquids which do not mix
two liquids which mix

13. Question

Which mixture can be best separated by fractional distillation?

water and butanol
water and butane
seawater and paraffin
sulfur and naphthalene

14. Question

(2017/NYGH/S3/IP/FE/P1/5) Which of the following properties provide the basis for separation using fractional distillation?

Boiling points
Colours
Densities
Solubilities in the same solvent

15. Question

(2018/NYGH/S3/IP/FE/P1/3) Which of the following mixtures of substances can be separated using a separating funnel?

ammonium chloride in lead(II) nitrate solution
potassium iodide solution in organic solvent, trichloromethane, CHCl3(l)
sodium nitrate and potassium nitrate in water
zinc oxide in water

16. Question

(2018/NYGH/S3/IP/FE/P1/3) Which of the following mixtures of substances can be separated using a separating funnel?

A
B
C
D

17. Question

(2018/TKGSS/FE1) A mixture containing equal volumes of two liquids that mix completely but do not react together is placed in the apparatus shown and heated until the thermometer first shows a steady reading. At which position will there be the highest proportion of the liquid with the higher boiling point?

A
B
C
D

18. Question

(2010/HC/S1) The diagram shows the apparatus being used to distill seawater. At which points will the temperature be 100 ^oC?

Y only
X and Y only
Y and Z only
X, Y and Z

19. Question

(2014/S4NYGH/IPFE/2) The apparatus below can be used to extract propanone, C₃H₆O (boiling point 56°C) from a solution of propanone containing plant dyes.

Which of the following statements is true about the plant dyes during the separation process?

They are collected as a distillate
They react to form a colourless product
They remain in the flask
They are removed by the cooling water

20. Question

(2017/NYGH/S3/IP/FE P1) Which of the following properties provide the basis for separation using fractional distillation?

Boiling points
Colours
Densities
Solubilities in the same solvent

21. Question

(2013/VS/S3/IP/SA1/7) The diagram shows the fractional distillation apparatus used to separate alcohol and water, which has a boiling point of 78 °C and 100 °C respectively.

Which of the following graphs best shows how the temperature varied with the volume of distillate collected?

A
B
C
D

22. Question

(2015/RP/S3/IP/FE/P1/5) A mixture of water and ethanol is being separated using the apparatus shown below.

Which statement about the process is false?

As the distillate is being collected, the temperatures at S and T are the same.
The above process is used to separate two miscible liquids of different boiling points.
The glass beads provide a large surface area for condensation and reboiling.
The thermometer measures the boiling point of the liquid being distilled.

23. Question

(2017/S3RP//MYCT) Toluene and cyclohexane are two common organic solvents and they are miscible in each other. The following graph shows the boiling points of mixtures containing different proportions of toluene and cyclohexane.

Which of the following statements(s) is/are correct?

1. The mixture can be separated by fractional distillation.

2. The boiling point of toluene is lower than that of cyclohexane.

3. Both toluene and cyclohexane are soluble in water.

1,2 and 3 are correct
1 and 2 are correct
2 and 3 are correct
1 only is correct

24. Question

The following graph shows the temperature changes when a 1:1 mixture of methanol (melting point – 97 ^oC, boiling point 65 ^oC) and propan 2-ol (melting point – 89 ^oC, boiling point 82 ^oC) was distilled.

If a 2 ml fraction of the distillate were collected at each of the points A, B, C and D indicated on the graph, which fraction would contain the highest proportion of methanol?

Fraction collected at A
Fraction collected at B
Fraction collected at C
Fraction collected at D

25. Question

(2012/S3RP//MYCT) Two liquids, X and Y, are placed in a separating funnel. Two layers are formed as shown in the diagram below.

From this, it can be deduced that liquid Y _____________________.

1. has a higher density than X

2. Is water

3. has a lower boiling point than liquid X

1, 2 and 3 are correct
1 and 2 are correct
2 and 3 are correct
1 only is correct

Pos.	Name	Entered on	Points	Result
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