Separation processes - Jamb Chemistry Past Questions and Answers

Question 1:

• JAMB 2019

When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are;

A. Nitrogen and carbon dioxide
B. The rare gases
C. Nitrogen and oxygen
D. Nitrogen and the rare gases
E. Nitrogen, carbondioxide and the rare gases

Question 2:

• JAMB 2019

By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and

A. Potassium nitrate
B. Sand
C. Lead nitrate
D. Sugar (glucose)
E. Starch

Question 3:

• JAMB 1978

By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and

A. Potassium nitrate
B. Sand
C. Lead nitrate
D. Sugar (glucose)
E. Starch

Question 4:

• JAMB 1979

When ammonium, potassium and calcium carbonates are each separately heated

A. None of them will decompose
B. Each of them will decompose to give carbondioxide and the respective oxide
C. Ammonium carbonate and potassium carbonate will not decompose
D. Only ammonium carbonate and the respective oxide
E. Ammonium carbonate will decompose to give carbondioxide, water and ammonia

Question 5:

• JAMB 1994

A mixture of sand, ammonium chloride and sodium chloride is best separated by?

A. Sublimation followed by addition of water and filteration
B. Sublimation followed by addition of water and evaporation
C. Addition of water followed by filtration and sublimation
D. Addition of water followed by crystallization and sublimation