JAMB Chemistry · Matter, atoms and chemical combination
Separation of mixtures and purification of chemical substances: JAMB Chemistry Past Questions and Answers
What the JAMB syllabus covers in Separation of mixtures and purification of chemical substances
Our summary: Elements, compounds and mixtures, how to tell pure from impure substances, and the methods used to separate mixtures.
- Elements, compounds and mixtures
- Chemical and physical changes
- Pure and impure substances
- Boiling, density, freezing and melting points
- Separation processes (Evaporation, simple and fractional distillation, sublimation, re-crystallization, paper and column chromatography, simple and fractional crystallization, magnetization, decantation, filtration and centrifugation.)
Objectives
- distinguish between elements, compounds and mixture;
- differentiate between chemical and physical changes;
- distinguish between pure and impure substances;
- use boiling and melting points as criteria for purity of chemical substances;
- identify the properties of the components of a mixture;
- specify the principle involved in each separation method; and
- apply the basic principle of separation processes in everyday life.
Syllabus content © The Joint Admissions and Matriculation Board (UTME).
JAMB Chemistry questions on Separation of mixtures and purification of chemical substances
- JAMB 2025The composition of petroleum varies because it is a
- JAMB 2025The fractions of crude oil are best separated by
- JAMB 2025An example of a physical change is
- JAMB 2024An example of a substance that does not change directly from solid to gas when heated is
- JAMB 2024What method is suitable for the separation of gases present in air?
- JAMB 2024During the fractional distillation of crude oil, the fraction that distills at 200 - 250 ^0 C is
- JAMB 2024An example of a physical change is
- JAMB 2024Which of these is the most preferred separation technique for the isolation of solutes where the purity of the constituent is of utmost importance?
- JAMB 2023Which separation technique is used to separate different pigments in a mixture based on their affinity for a stationary phase and a mobile phase?
- JAMB 2023Which of the following statements is true regarding the melting and boiling points of pure substances?
- JAMB 2023What is the mass (in grams) of 500 mL of ethanol? (density of ethanol = 0.789 g/mL)
- JAMB 2023Which of the following methods is commonly used to remove suspended impurities from water?
- JAMB 2022Which of the following best represent solid gas mixture?
- JAMB 2022Addition of sodium chloride to water to form a solution would lead to?
- JAMB 2022Crude petroleum is converted to useful products by the process of?
- JAMB 2021A sample of any of the following substances disappears after some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?
- JAMB 2021Which of the following are chemical changes? I. cooking of food II. digestion of food III. freezing of water IV. water is heated up
- JAMB 2021Which one of the following is not a mixture?
- JAMB 2020Which of the following can be obtained by fractional distillation?
- JAMB 2020Chromatography is used to separate components of mixture which differ in their rates of ?
- JAMB 2020Which of the following substances is a mixture?
- JAMB 2020When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?
- JAMB 2020To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?
- JAMB 2019What technique is suitable for separating a binary solution of potassium chloride and potassium trioxochlorate (V)?
- JAMB 2019Which of the following pairs cannot be represented with a chemical formula?
- JAMB 2019Which of the following sets of operation will completely separate a mixture of sodium chloride, sand and iodine?
- JAMB 2019Which of the following is a physical change?
- JAMB 2019Which of the following does not support the fact that air is a mixture?
- JAMB 2018Which of the following are mixtures? I. Petroleum II. Rubber latex III. Vulcanizer's solution IV. Carbon sulphide
- JAMB 2018Methanoic acid mixes with water in all proportions and has about the same boiling point as water. Which of the following methods would you adopt to obtain pure…
- JAMB 2018Which of the following separation techniques can be employed in obtaining solvent from its solution?
- JAMB 2018Which of the following is an example of a chemical change?
- JAMB 2018Sieving is a technique used to separate mixtures containing solid particles of
- JAMB 2016The metal whose ore can be concentrated by passing it through a magnetic separator is
- JAMB 2016Ammonium chloride can be separated from its mixture with common salt by
- JAMB 2016The principle of column chromatography is based on th ability of the constituents to
- JAMB 2015A small quantity of solid ammonium chloride (NH4Cl) heated gently in a test tube, the solid gradually disappear produce two gases. Later, a white cloudy deposit…
- JAMB 2015A difference between chemical and physical change is that in a chemical change
- JAMB 2015The filter in the cigarette reduce the nicotine construct by
- JAMB 2015Which of these require crystallization most?
- JAMB 2015In countries where the temperature fall below 273k, salt always spilled on the road in order to
- JAMB 2014A mixture is different from a compound because
- JAMB 2012I. It has a varied composition from one place to another. ll. it constituents can be separated by physical means lll. It contains unreactive noble gases which…
- JAMB 2012Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?
- JAMB 2011The principle of column chromatography is based on the ability of the constituents to
- JAMB 2010Which of the following is an example of a mixture?
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