Waec Chemistry 2000 Past Questions and Answers

Question 31:

• WAEC 2000

Which of the following procedures is suitable for identifying the food colouring added to a pastry sample?

A. The cathode becomes coated with copper
B. Both electrodes gain electrons
C. The blue colour of the solution fades gradually
D. The anode increases in mass

Question 32:

• WAEC 2000

Which of the following procedures is suitable for identifying the food colouring added to a pastry sample?

A. Carry out some food tests
B. Examine the pastry sample under a microscope
C. Do a chromotogram of the colouring extract
D. Determine the molar mass of the colouring

Question 33:

• WAEC 2000

C₈H₁₈ will undergo the following reactions except

A. Cracking
B. Combustion
C. Substitution
D. Addition

Question 34:

• WAEC 2000

Which of the following is correct about both compounds show below? CH₃CH ₂CH₂OH;CH ₃
CH ₂CH(OH)CH₃

A. They have identical physical properties
B. They are structural isomers
C. Their general molecular formula is the same
D. They are oxidized to alkanones

Question 35:

• WAEC 2000

Which of the following needs to be hydrolysed before it shows reducing property?

A. Glucose
B. Maltose
C. Sucrose
D. Fructose