Important MCQs on mixtures-solutions-and-their-separation-techniques-for-CBSE Class-9-Science-Chapter-2-part-3
Mastering Separation Techniques: A Comprehensive Guide to Mixture Separation Methods
Learn about different ways to separate
mixtures in this easy guide. Discover how chromatography, distillation,
filtration, and other methods work. Find out which technique is best for
separating sand from salt or purifying liquids. Whether you’re curious about
how a separating funnel works or the basics of centrifugation, this guide makes
complex methods simple and clear. Perfect for anyone who wants to understand
how we separate different substances in everyday life.
Here are Top 50 Multiple-choice-questions-focusing-on-mixtures-solutions-and-separation-techniques-for-CBSE-Class-9-chapter-2-part-3
101. Which technique is commonly used
to separate components of a mixture based on their different solubilities in a
solvent?
A) Filtration
B) Chromatography
C) Distillation
D) Centrifugation
Answer: B) Chromatography
Explanation: Chromatography separates
components based on differences in solubility and affinity for the stationary
phase.
102. What method would be most
appropriate for separating a mixture of salt and sand?
A) Filtration followed by evaporation
B) Magnetic separation
C) Distillation
D) Sifting
Answer: A) Filtration followed by
evaporation
Explanation: Filtration separates sand
from saltwater, and evaporation removes the water to obtain salt.
103. What type of mixture is formed
when sand is mixed with water and left to settle?
A) Solution
B) Colloid
C) Suspension
D) Emulsion
Answer: C) Suspension
Explanation: Sand in water is a
suspension because the sand particles can settle over time.
104. Which technique separates
components of a mixture based on their boiling points?
A) Filtration
B) Distillation
C) Centrifugation
D) Chromatography
Answer: B) Distillation
Explanation: Distillation utilizes
differences in boiling points to separate components.
105. What type of mixture is
toothpaste classified as?
A) Solution
B) Colloid
C) Suspension
D) Emulsion
Answer: C) Suspension
Explanation: Toothpaste is a
suspension containing solid particles in a gel base.
106. How can you separate a mixture of
two liquids that do not mix with each other?
A) Filtration
B) Distillation
C) Separating funnel
D) Evaporation
Answer: C) Separating funnel
Explanation: A separating funnel is
used to separate immiscible liquids based on their different densities.
107. What principle is used in
centrifugation?
A) Difference in boiling points
B) Difference in particle size
C) Difference in solubility
D) Difference in density
Answer: D) Difference in density
Explanation: Centrifugation separates
substances based on differences in density by spinning them at high speeds.
108. Which separation method is based
on the difference in solubility of substances?
A) Filtration
B) Chromatography
C) Evaporation
D) Centrifugation
Answer: B) Chromatography
Explanation: Chromatography separates
substances based on their solubility differences in a solvent.
109. What type of mixture is formed
when sugar is dissolved in water?
A) Solution
B) Colloid
C) Suspension
D) Emulsion
Answer: A) Solution
Explanation: A solution is formed when
sugar dissolves completely in water, creating a homogeneous mixture.
110. What is the primary purpose of
using a separating funnel in laboratory settings?
A) To separate solids from liquids
B) To separate immiscible liquids
C) To purify liquids
D) To dissolve solids
Answer: B) To separate immiscible
liquids
Explanation: A separating funnel is
used to separate immiscible liquids based on density differences.
111. What type of mixture is formed
when oil is mixed with vinegar?
A) Solution
B) Colloid
C) Suspension
D) Emulsion
Answer: C) Suspension
Explanation: Oil and vinegar form a
suspension because they do not mix uniformly and can separate into layers.
112. Which method is effective for
separating components of a mixture that have different affinities for a
stationary phase?
A) Filtration
B) Distillation
C) Chromatography
D) Centrifugation
Answer: C) Chromatography
Explanation: Chromatography separates
components based on their differing affinities for the stationary and mobile
phases.
113. Which of the following is a
method to separate a solid from a liquid using a porous barrier?
A) Filtration
B) Distillation
C) Centrifugation
D) Evaporation
Answer: A) Filtration
Explanation: Filtration uses a porous
barrier to separate solids from liquids.
114. What separation technique would
be used to obtain pure water from a salt solution?
A) Filtration
B) Distillation
C) Chromatography
D) Centrifugation
Answer: B) Distillation
Explanation: Distillation is used to
separate pure water from a salt solution by boiling and condensing the vapor.
115. Which method separates substances
based on differences in their boiling points?
A) Filtration
B) Distillation
C) Chromatography
D) Centrifugation
Answer: B) Distillation
Explanation: Distillation relies on
differences in boiling points to separate substances.
116. Which of the following is an
example of a homogeneous mixture?
A) Vegetable soup
B) Concrete
C) Air
D) Sand and salt mixture
Answer: C) Air
Explanation: Air is a homogeneous
mixture of gases.
117. What is the main principle behind
the use of a centrifuge?
A) Difference in solubility
B) Difference in density
C) Difference in particle size
D) Difference in boiling points
Answer: B) Difference in density
Explanation: Centrifugation separates
substances based on their densities by spinning them rapidly.
118. Which technique would you use to
separate a mixture of salt and sugar?
A) Filtration
B) Distillation
C) Chromatography
D) Sifting
Answer: B) Distillation
Explanation: Distillation can separate
salt from sugar if both are dissolved in different solvents, based on their
boiling points.
119. What type of mixture is lemonade
with pulp?
A) Solution
B) Colloid
C) Suspension
D) Emulsion
Answer: C) Suspension
Explanation: Lemonade with pulp is a
suspension because the pulp particles are suspended in the liquid.
120. How would you separate a mixture
of iron filings and sulphur powder?
A) Filtration
B) Magnetic separation
C) Distillation
D) Chromatography
Answer: B) Magnetic separation
Explanation: Magnetic separation can
be used to remove iron filings from sulphur powder, as iron is magnetic.
121. Which method is used to separate
components of a mixture based on differences in their boiling points and
condensation?
A) Filtration
B) Distillation
C) Chromatography
D) Centrifugation
Answer: B) Distillation
Explanation: Distillation involves
heating a mixture to separate components based on boiling points and condensing
the vapor.
122. What is the process of removing
the liquid component from a mixture to leave behind a solid called?
A) Filtration
B) Evaporation
C) Distillation
D) Chromatography
Answer: B) Evaporation
Explanation: Evaporation removes the
liquid, leaving behind the solid.
123. Which method would be appropriate
for separating a mixture of sand and salt?
A) Filtration followed by evaporation
B) Magnetic separation
C) Distillation
D) Sifting
Answer: A) Filtration followed by
evaporation
Explanation: Filtration separates the
sand from the saltwater, and evaporation removes the water to get the salt.
124. What type of mixture is formed
when a solid is dispersed in a liquid but does not dissolve?
A) Solution
B) Colloid
C) Suspension
D) Emulsion
Answer: C) Suspension
Explanation: A suspension is a mixture
where the solid particles are dispersed but not dissolved in the liquid.
125. Which separation method would be
used to separate a mixture of different coloured inks?
A) Filtration
B) Distillation
C) Chromatography
D) Evaporation
Answer: C) Chromatography
Explanation: Chromatography separates
different coloured inks based on their different rates of movement through a
medium.
126. How can you separate a mixture of
two immiscible liquids with different densities?
A) Filtration
B) Separating funnel
C) Evaporation
D) Distillation
Answer: B) Separating funnel
Explanation: A separating funnel is
used to separate immiscible liquids based on density differences.
127. What is the main principle behind
filtration?
A) Difference in boiling points
B) Difference in density
C) Difference in particle size
D) Difference in solubility
Answer: C) Difference in particle size
Explanation: Filtration separates
particles based on size differences.
128. What separation technique is used
to separate a mixture of liquids and solids where the solid is dissolved in the
liquid?
A) Filtration
B) Distillation
C) Chromatography
D) Evaporation
Answer: B) Distillation
Explanation: Distillation separates
dissolved solids from liquids by utilizing differences in boiling points.
129. Which of the following is an
example of a heterogeneous mixture?
A) Saltwater
B) Sugar solution
C) Salad
D) Air
Answer: C) Salad
Explanation: A salad is a
heterogeneous mixture because its components are visibly distinct.
130. What is the purpose of using a
paper filter in the filtration process?
A) To dissolve substances
B) To separate liquids from gases
C) To separate solids from liquids
D) To heat mixtures
Answer: C) To separate solids from
liquids
Explanation: A paper filter separates
solid particles from liquids.
131. What type of mixture is milk
classified as?
A) Solution
B) Colloid
C) Suspension
D) Emulsion
Answer: B) Colloid
Explanation: Milk is a colloid where
fat droplets are dispersed in water.
132. Which technique is suitable for
separating a mixture of small particles of sand and larger particles of gravel?
A) Filtration
B) Sifting
C) Chromatography
D) Centrifugation
Answer: B) Sifting
Explanation: Sifting separates
particles based on size differences.
133. What method is used to purify a
liquid by boiling it and then condensing the vapor?
A) Filtration
B) Distillation
C) Chromatography
D) Centrifugation
Answer: B) Distillation
Explanation: Distillation purifies a
liquid through boiling and condensation.
134. Which technique is used to
separate a mixture based on differences in the solubility of its components?
A) Filtration
B) Distillation
C) Chromatography
D) Sifting
Answer: C) Chromatography
Explanation: Chromatography separates
components based on solubility differences.
135. How can you separate a mixture of
alcohol and water?
A) Filtration
B) Chromatography
C) Distillation
D) Centrifugation
Answer: C) Distillation
Explanation: Distillation separates
alcohol from water based on different boiling points.
136. Which method would you use to
separate a mixture of flour and small stones?
A) Filtration
B) Sifting
C) Chromatography
D) Distillation
Answer: B) Sifting
Explanation: Sifting separates
particles based on size differences.
137. What type of mixture is a
milkshake considered to be?
A) Solution
B) Colloid
C) Suspension
D) Emulsion
Answer: C) Suspension
Explanation: A milkshake is a
suspension because the solid particles are dispersed but not dissolved.
138. Which separation technique would
be best for separating a mixture of two solids with different sizes?
A) Filtration
B) Sifting
C) Chromatography
D) Centrifugation
Answer: B) Sifting
Explanation: Sifting separates solids
based on particle size.
139. What process is used to separate
a mixture of gases?
A) Filtration
B) Distillation
C) Chromatography
D) Centrifugation
Answer: B) Distillation
Explanation: Distillation can be used
to separate gases based on differences in boiling points.
140. Which technique is effective for
separating a mixture of solid particles suspended in a liquid?
A) Filtration
B) Distillation
C) Chromatography
D) Sifting
Answer: A) Filtration
Explanation: Filtration separates
suspended solid particles from liquids.
141. What type of mixture is created
when powdered cocoa is added to milk and stirred but does not dissolve
completely?
A) Solution
B) Colloid
C) Suspension
D) Emulsion
Answer: C) Suspension
Explanation: Cocoa in milk forms a
suspension if it does not dissolve completely.
142. Which method would be most
effective for separating a mixture of small beads and sand?
A) Filtration
B) Sifting
C) Centrifugation
D) Chromatography
Answer: B) Sifting
Explanation: Sifting separates
particles based on size differences, effectively separating beads from sand.
143. What separation method would be
used for a mixture of two liquids with similar boiling points?
A) Filtration
B) Distillation
C) Chromatography
D) Centrifugation
Answer: B) Distillation
Explanation: Distillation can separate
liquids with similar boiling points using fractional distillation.
144. Which separation technique would
you use to remove dissolved salt from a seawater sample?
A) Filtration
B) Distillation
C) Chromatography
D) Centrifugation
Answer: B) Distillation
Explanation: Distillation separates
salt from seawater by evaporating and then condensing the water.
145. What is the process called where
a solid is separated from a liquid by passing the mixture through a porous
material?
A) Filtration
B) Evaporation
C) Distillation
D) Chromatography
Answer: A) Filtration
Explanation: Filtration separates
solids from liquids using a porous material.
146. What type of mixture is formed
when particles of one substance are evenly dispersed throughout another
substance but not dissolved?
A) Solution
B) Colloid
C) Suspension
D) Emulsion
Answer: B) Colloid
Explanation: Colloids have particles
dispersed evenly throughout another substance without dissolving.
147. Which technique is most suitable
for separating a mixture of substances that have different rates of movement
through a medium?
A) Filtration
B) Distillation
C) Chromatography
D) Centrifugation
Answer: C) Chromatography
Explanation: Chromatography separates
substances based on their different rates of movement through a medium.
148. What separation technique would
be used to obtain the solvent from a solute in a solution?
A) Filtration
B) Evaporation
C) Distillation
D) Chromatography
Answer: B) Evaporation
Explanation: Evaporation removes the
solvent, leaving the solute behind.
149. What method would you use to
separate a mixture of sand and salt if both are dissolved in water?
A) Filtration
B) Evaporation
C) Distillation
D) Sifting
Answer: C) Distillation
Explanation: Distillation separates
sand from saltwater by evaporating and condensing the water.
150. Which of the following methods
separates a mixture based on differences in the solubility of its components?
A) Filtration
B) Distillation
C) Chromatography
D) Centrifugation
Answer: C) Chromatography
Explanation: Chromatography separates
based on solubility differences in a solvent.