Waec Chemistry 2003 Past Questions and Answers

Question 31:

• WAEC 2003

What process does the following equation represent ? (C ₆H ₁₀O ₅) + nH₂O → nC₆H ₁₂O?₆

A. Polymerization of glucose
B. Hydrolysis of starch
C. Fermentation of sugar
D. Dehydration of carbohydates

Question 32:

• WAEC 2003

When excess ethene is shaken with acidified KMnO₄ solution, the product obtained is

A. Ethane
B. Ethanal
C. Ethane - 1, 2 - diol
D. Ethanoic acid

Question 33:

• WAEC 2003

What volume of 0.20 mol dm ^-3 NaOH solution would yield 5.0 g of NaOH on evaporation to dryness? [NaOH = 40g mol^-1]

A. 400 cm³
B. 625 cm³
C. 1000 cm³
D. 1600 cm ³

Question 34:

• WAEC 2003

Which of the following compound is used for removing impurities from bauxite?

A. NaOH
B. CaCO₃
C. Na₃AIF₆
D. H₂SO₄

Question 35:

• WAEC 2003

What is the main impurity in haematite?

A. CaSiO₃
B. CaCO₃
C. SiO₃
D. Fe₂O₃