Chemistry 2004 Waec Past Questions and Answers

Question 21 :

• WAEC 2004

Glucose gives a brick-red precipitate with Fehling's solution because it is

A. Carbohydrate
B. An alkanoate
C. A reducing sugar
D. A non-electrolyte

Question 22 :

• WAEC 2004

What is the IUPAC name of CH₃CH₂COOCH ₃?

A. Ethylethanoate
B. Methylethanoate
C. Methylpropanoate
D. Propylmethanoate

Question 23 :

• WAEC 2004

The mass of 800cm³ of a gas X at s.t.p. is 1.0g. What is the molar mass of X? [1 mole of a gas at s.t.p occupies 22.4dm ³]

A. 18.0g mol^-1
B. 22.4g mol^-1
C. 28.0gmol^-1
D. 36.0gmol^-1

Question 24 :

• WAEC 2004

Which of the following compounds is a soapless detergent?

A. C ₁₂H ₂₅OSO₃Na
B. C ₁₇H ₃₅COONa
C. C ₆H₅OH₃
D. C ₄H₉COOC₂H ₅

Question 25 :

• WAEC 2004

The reaction that takes place at the cathode when an aqueous solution of NaCI is electrolysed using carbon electrodes is

A. 2H⁺_2(g) + 2e^- → H_2(g)
B. Na⁺_2(g) + e^- → Na_(s)
C. 4OH^- → 2H₂O_(l) + O_2(g) +4e_-
D. 2CI_- → CI_2(g) + 2e^-