Waec Chemistry 2002 Past Questions and Answers

Question 46:

• WAEC 2002

Which of the following statements about soapless detergents is correct? They

A. Lather readily with hard water
B. Increase the surface tension of water
C. Cause hydrolysis of salts in water
D. From a curdy precipitate with soft water

Question 47:

• WAEC 2002

Which of the following types of alkanols undergo oxidation to produce alkanoic acids? 1. Primary alkanols 11. Secondary alkanols 111. Tertiary alkanols

A. 1,11 and 111
B. L and ll only
C. Ll only
D. L only

Question 48:

• WAEC 2002

A suitable reagent for distinguishing between ethanoic acid ethanol is

A. Bromine water
B. Fehling's solution
C. Sodium hydrogentrioxocarbonate (IV)
D. Ammoniacal silver trioxonitrate (V)

Question 49:

• WAEC 2002

The reaction of sucrose with dilute HCI produces

A. An alkanoate
B. Glucose and fructose
C. A black mass of carbon
D. A polysaccharide

Question 50:

• WAEC 2002

The energy value of petrol can be determined by a

A. Bomb calorimeter
B. Catalytic cracker
C. Fractionating column
D. Thermometer