Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 16:

• JAMB 1982

100 cm³ of oxygen is made to react with 50 cm ³ of hydrogen, and the whole reaction mixture was then passed through anhydrous calcium chloride. What is the volume of gas left?

A. 5 cm³
B. 25 cm³
C. 50 cm³
D. 75 cm³
E. 100 cm³

Question 17:

• JAMB 1983

An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.
Reaction of X with yeast forms the basis of the

A. Plastic industry
B. Textile industry
C. Brewing industry
D. Soap industry
E. Dyeing industry

Question 18:

• JAMB 1983

The cracking process is very important in the petroleum industry because it.

A. Gives purer products
B. Yields more lubricants
C. Yields more engine fuels
D. Yields more asphalt
E. Yields more candle wax

Question 19:

• JAMB 1984

When the kerosene fraction from petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as

A. Polymerization
B. Refining
C. Hydrogenation
D. Cracking

Question 20:

• JAMB 1985

Which of the following is used in the manufacture of bleaching powder?

A. Sulphur dioxide
B. Chlorine
C. Hydrogen tetraoxosulphate (VI)
D. Hydrogen sulphide
E. Nitrogen dioxide