Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 76:

• JAMB 1995

When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain?

A. Ethane
B. Chlorine
C. Hydrogen chloride
D. Ethene

Question 77:

• JAMB 1995

In the industrial production of hydrogen from natural gas, carbon (IV) oxide produced along with the hydrogen is removed by?

A. Washing under pressure
B. Passing the mixture into lime water
C. Using ammoniacal copper (l) chloride
D. Drying over phoshorus (V) oxide

Question 78:

• JAMB 1995

In the extraction of iron in the blast furnace, limestone is used to?

A. Release CO₂ for the reaction
B. Reduce the iron ore
C. Increase the strenght of the iron
D. Remove impurities

Question 79:

• JAMB 1995

Which of the following compounds will impart a brick-red colour to a non-luminious bunsen flame?

A. NaCl
B. LiCl
C. CaCl₂
D. MgCl₂

Question 80:

• JAMB 1995

The role of sodium chloride in the preparation of soap is to?

A. Purify the soap
B. Separate the soap from glycerol
C. Accelerate the decomposition of the fat or oil
D. React with glycerol