Class 9 Exploring Mixtures and their Separation Mock Test (CBSE)

Topics in Exploring Mixtures and their Separation

• Classification of mixtures
• Concentration of a solution
• Solubility
• Crystallisation
• Distillation
• Paper chromatography
• Separating immiscible liquids
• Sublimation
• Suspensions
• Colloids
• Tyndall effect

Exploring Mixtures and their Separation practice questions with answers

1. Q1Multiple choice·1 mark
   If $10\text{ g}$ of salt is dissolved in $90\text{ g}$ of water, the mass percentage of the solution is:

   1. (a)$10\%$
   2. (b)$11.1\%$
   3. (c)$9\%$
   4. (d)$1\%$
   Show answer and step marks

   1. Correct option: (a) $10\%$+1

   Answer: (a)
2. Q2Multiple choice·1 mark
   Which of the following mixtures shows the Tyndall effect?

   1. (a)Salt water
   2. (b)Milk
   3. (c)Copper sulphate solution
   4. (d)Sugar solution
   Show answer and step marks

   1. Correct option: (b) Milk+1

   Answer: (b)
3. Q3Multiple choice·1 mark
   A mixture of two immiscible liquids can be separated by using a:

   1. (a)Separating funnel
   2. (b)Distillation flask
   3. (c)Fractionating column
   4. (d)Filter paper
   Show answer and step marks

   1. Correct option: (a) Separating funnel+1

   Answer: (a)
4. Q4Multiple choice·1 mark
   A student receives a solid mixture containing camphor, common salt, and fine sand. Which of the following correct sequences of techniques should the student use to separate all three components successfully?

   1. (a)Sublimation, filtration, dissolution in water, and evaporation
   2. (b)Sublimation, dissolution in water, filtration, and evaporation
   3. (c)Filtration, sublimation, fractional distillation, and crystallisation
   4. (d)Sublimation, magnetic separation, and simple distillation
   Show answer and step marks

   1. Correct option: (b) Sublimation, dissolution in water, filtration, and evaporation. Sublimation removes camphor; the salt and sand are then dissolved in water, the insoluble sand is filtered off, and the filtrate is evaporated to recover salt. Filtering before dissolving cannot separate the dry salt and sand, and none of the components is magnetic.+1

   Answer: (b)

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