Important 50nos MCQ for CBSE Class 9 Science Chapter 2: Is Matter Around Us Pure

Important MCQs on mixtures-solutions-and-their-separation-techniques-for-CBSE Class-9-Science-Chapter-2-part-3

CBSE SCIENCE CHAPTER-2 ( IS MATTER AROUND US PURE ) : Part-3
Important 50nos MCQ for CBSE Class 9 Science Chapter 2: Is Matter Around Us Pure

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.

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