Mixtures and their Separation
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Chromatography-advanced
SubtopicChromatography-advanced under Mixtures and their Separation for Grade 9 CBSE.
Preview questions (no answers)
- 1.
Which of these is NOT a type of chromatography?
A.Paper Chromatography
B.Gas Chromatography
C.Filtration Chromatography
D.Thin Layer Chromatography
- 2.
Chromatography is used by forensic scientists to:
A.Measure the weight of a person
B.Analyze ink on a ransom note
C.Look at stars
D.Build walls
- 3.
If a component has an value of , what does it mean?
A.It moved to the top
B.It did not move from the baseline
C.It moved halfway
D.The solvent did not move
- 4.
Why should the jar be covered with a lid during the process?
A.To prevent the solvent from evaporating
B.To keep the paper from falling
C.To hide the colors
D.To increase gravity
- 5.
In a forensics lab, chromatography is used to match a ink sample from a ransom note. This works because:
A.Every pen uses exactly the same ink
B.Inks from different manufacturers have unique combinations of dyes
C.Inks always contain only one dye
D.The paper of the note dissolves in the solvent
- 6.
Which of the following best defines 'Solubility' in the context of chromatography?
A.The ability of the solute to evaporate
B.The ability of the solute to dissolve in the mobile phase
C.The weight of the solute
D.The color intensity of the solute
- 7.
What is the benefit of chromatography over simple distillation for separating dyes?
A.Dyes often decompose at their boiling points
B.Chromatography is much faster
C.Distillation requires a vacuum
D.Dyes cannot be heated
- 8.
Which of these statements perfectly summarizes the principle of chromatography?
A.It is a physical method of separation based on the difference in boiling points.
B.It is a separation technique based on the differential distribution of components between a stationary phase and a mobile phase.
C.It is a chemical method where components react with the solvent to form precipitates.
D.It is a technique used only for separating colored substances.
- 9.
Why is it important to stop the chromatography run before the solvent front reaches the top of the paper?
A.To prevent the solvent from spilling.
B.To be able to measure the exact distance traveled by the solvent front for calculation.
C.To prevent the paper from catching fire.
D.To ensure the spots don't change color.
- 10.
When separating a mixture of metallic ions (like , ), what is often used to visualize the spots?
A.Ultraviolet light
B.Specific chemical reagents that form colored complexes with the ions.
C.Simple water spray
D.Measuring the weight of the paper.
Download the worksheet for Mixtures and their Separation - Chromatography-advanced to practice offline. It includes additional chapter-level practice questions.
Fractional Distillation-advanced
SubtopicFractional Distillation-advanced under Mixtures and their Separation for Grade 9 CBSE.
Preview questions (no answers)
- 1.
Which of these is the most volatile liquid in a mixture of Ethanol () and Water ()?
A.Water
B.Ethanol
C.Both are equally volatile
D.Neither is volatile
- 2.
What is the state of Carbon Dioxide when air is cooled to ?
A.Liquid
B.Gas
C.Solid
D.Plasma
- 3.
Fractional distillation can be used to separate a mixture of ____________ liquids.
A.Two or more miscible
B.Only two immiscible
C.Two solids
D.A gas and a solid
- 4.
When separating air, which gas has a boiling point of ?
A.Nitrogen
B.Oxygen
C.Argon
D.Neon
- 5.
In the industrial process for separating components of air, the air is purified, compressed, and cooled. It is then passed through an 'Expansion Jet' as shown in the process flow below. What is the primary purpose of this expansion stage?
A.To increase the pressure of the air to raise the boiling points of the gases.
B.To filter out remaining dust particles and water vapor from the mixture.
C.To achieve liquefaction by causing a sudden drop in pressure and temperature.
D.To allow Nitrogen gas to escape immediately while keeping Oxygen as a solid.
- 6.
In fractional distillation, the process of 'condensation' occurs in:
A.The distillation flask only
B.The fractionating column and the condenser
C.The receiver flask only
D.The thermometer
- 7.
Which gas has a boiling point of approximately ?
A.Nitrogen
B.Helium
C.Oxygen
D.Hydrogen
- 8.
Which of these gases is not typically collected via the fractional distillation of liquid air because its concentration is too low or it doesn't liquefy easily under standard ASU conditions?
A.Argon
B.Helium
C.Nitrogen
D.Oxygen
- 9.
If the atmospheric pressure is reduced, how does it affect the fractional distillation process?
A.The boiling points of all components will decrease.
B.The boiling points of all components will increase.
C.The boiling points remain the same, but separation is faster.
D.The liquids will stop vaporizing.
- 10.
In the petroleum industry, what is the 'residue' at the bottom of the fractionating column used for?
A.Aviation fuel
B.Fuel for cars
C.Asphalts for roads and roofing
D.Cooking gas
Download the worksheet for Mixtures and their Separation - Fractional Distillation-advanced to practice offline. It includes additional chapter-level practice questions.
How is it different from simple distillation?-advanced
SubtopicHow is it different from simple distillation?-advanced under Mixtures and their Separation for Grade 9 CBSE.
Preview questions (no answers)
- 1.
The component with the ________ boiling point remains in the flask the longest.
A.Lowest
B.Highest
C.Intermediate
D.Zero
- 2.
If two liquids have boiling points of and , which method is most suitable?
A.Simple Distillation
B.Fractional Distillation
C.Separating Funnel
D.Magnet
- 3.
Is distillation a physical or chemical separation method?
A.Chemical
B.Physical
C.Biological
D.None of these
- 4.
Distillation can be used to separate a mixture of salt and water. This is an example of:
A.Simple Distillation
B.Fractional Distillation
C.Chromatography
D.Filtration
- 5.
If you have a mixture of liquid oxygen and liquid nitrogen, which one will evaporate first upon slight warming?
A.Oxygen
B.Nitrogen
C.Both together
D.Neither
- 6.
Simple distillation is a one-stage process, whereas fractional distillation is a:
A.Zero-stage process
B.Multi-stage process
C.Chemical reaction process
D.Sublimation process
- 7.
What is the role of the 'cold water in' and 'warm water out' in the condenser?
A.To increase the pressure of the vapor
B.To remove the latent heat of vaporization from the vapors
C.To add chemical vapors to the mixture
D.To wash the condensed liquid
- 8.
If you are given a mixture of Helium (BP ) and Neon (BP ), why would you need extremely specialized equipment compared to separating Ethanol and Water?
A.Because they are noble gases and don't boil
B.Because their boiling points are extremely low, requiring cryogenics and high-precision columns
C.Because they are both solids at room temperature
D.Because they have the same boiling point
- 9.
What is the role of the 'cold water in' and 'water out' ports on a Liebig condenser?
A.To maintain a constant pressure
B.To create a temperature gradient for the vapor to condense into liquid
C.To wash the distillate
D.To provide the liquid for the distillation flask
- 10.
Fractional distillation is used to separate 'miscible' liquids. What does 'miscible' mean?
A.Liquids that do not mix and form layers
B.Liquids that react to form a solid
C.Liquids that dissolve in each other in all proportions
D.Liquids that have the same density
Download the worksheet for Mixtures and their Separation - How is it different from simple distillation?-advanced to practice offline. It includes additional chapter-level practice questions.
Application of Fractional Distillation-advanced
SubtopicApplication of Fractional Distillation-advanced under Mixtures and their Separation for Grade 9 CBSE.
Preview questions (no answers)
- 1.
The vapors of the liquid with the lower boiling point reach the top of the fractionating column and enter the:
A.Receiving flask
B.Water condenser
C.Heating flask
D.Thermometer bulb
- 2.
A simple fractionating column is a tube packed with:
A.Cotton
B.Glass beads
C.Charcoal
D.Sand
- 3.
Liquid air is allowed to warm up slowly in the:
A.Condenser
B.Fractional distillation column
C.Separator
D.Compressor
- 4.
Which of these is the most volatile component in a mixture of liquids?
A.The one with the highest boiling point
B.The one with the lowest boiling point
C.The one with the highest density
D.The one with the lowest density
- 5.
If a mixture contains three miscible liquids A (B.P. ), B (B.P. ), and C (B.P. ), which will be collected last during fractional distillation?
A.Liquid A
B.Liquid B
C.Liquid C
D.All will be collected at the same time
- 6.
The efficiency of a fractionating column is determined by its:
A.Material
B.Surface area provided for condensation
C.Weight
D.Transparency
- 7.
Which gas is used in the manufacture of steel and in hospitals for artificial respiration, obtained from air?
A.Nitrogen
B.Argon
C.Oxygen
D.Neon
- 8.
Which of these factors does NOT affect the separation of components in a fractional distillation column?
A.The rate of heating.
B.The color of the liquids being separated.
C.The surface area of the packing material.
D.The height of the column.
- 9.
If the boiling point of liquid A is and liquid B is , what is the temperature of the vapor halfway up the fractionating column during the distillation of A?
A.Exactly
B.Exactly
C.Somewhere between and
D.Higher than
- 10.
In a fractionating column, as the vapor moves upwards, it becomes:
A.Richer in the less volatile component.
B.Richer in the more volatile component.
C.Hotter as it reaches the top.
D.More dense.
Download the worksheet for Mixtures and their Separation - Application of Fractional Distillation-advanced to practice offline. It includes additional chapter-level practice questions.