Separation of mixtures and purification of chemical substances - Jamb Chemistry Past Questions and Answers

Question 116:

• JAMB 2018

Which of the following separation techniques can be employed in obtaining solvent from its solution?

A. Evaporation
B. Distillation
C. Filtration
D. Precipitation

Question 117:

• JAMB 2019

The combustion of carbon(ii)oxide in oxygen can be represented by equation.
2CO + O\(_2\) → 2CO\(_2\)
Calculate the volume of the resulting mixture at the end of the reaction if 50cm\(_3\) of carbon(ii)oxide was exploded in 100cm\(_3\) of oxygen

A. 75cm\(^3\)
B. 125cm\(^3\)
C. 100cm\(^3\)
D. 50cm\(^3\)

Question 118:

• JAMB 2019

Which of the following does not support the fact that air is a mixture?

A. The constituents of air are in a fixed proportion by mass
B. It cannot be represented with a chemical formula
C. The constituents of air can be separated by physical by physical means
D. None of the above

Question 119:

• JAMB 2019

What technique is suitable for separating a binary solution of potassium chloride and potassium trioxochlorate (V)?

A. Fractional crystallization
B. Fractional distillation
C. Filtration
D. Evaporation

Question 120:

• JAMB 2019

Which of the following is a physical change?

A. Exposing white phosphorus to air
B. Burning kerosene
C. Dissolving calcium in water
D. Freezing ice cream