JAMB Chemistry questions: Separation of mixtures and purification

24 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Separation of mixtures and purification· JAMB

   Which of the following is a physical change?

   • Asouring of milk
   • Bburning paper
   • Crusting of iron
   • Ddissolving sugar in water

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   Explanation and discussion

2. Question 22· Separation of mixtures and purification· JAMB

   The components of liquid air are separated by fractional distillation because they have different

   • Asolubilities
   • Bdensities
   • Ccolours
   • Dboiling points

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   Explanation and discussion

3. Question 23· Separation of mixtures and purification· JAMB

   Decantation is used to separate

   • Atwo gases
   • Btwo miscible liquids
   • Ca dissolved salt from water
   • Da liquid from a solid that has settled at the bottom

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   Explanation and discussion

4. Question 24· Separation of mixtures and purification· JAMB

   In a paper chromatogram, a spot moves 3 cm while the solvent front moves 6 cm. Find the Rf value of the spot.

   • A2
   • B0.5
   • C3
   • D0.18

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   Explanation and discussion