Waec Chemistry 2006 Past Questions and Answers

Question 11:

• WAEC 2006

The indicator used in neutralizing CH₃COOH and NaOH solution has pH range of

A. 3-5
B. 7-8
C. 8-10³
D. 10-12

Question 12:

• WAEC 2006

When aqueous ammonia is added to one of the following solutions,a white precipitate which dissolved in excess ammonia is formed Identify the solution.

A. ZnCl_2(aq)
B. Pb(NO₃)_2(aq)
C. CuSO_4(aq)
D. FeSO_4(aq)

Question 13:

• WAEC 2006

Which of the following compounds absorbs moisture from the atmosphere and dissolves in it?

A. FeCI₃
B. MgSO₄.7H₂O
C. Na₂SO ₄
D. KCI

Question 14:

• WAEC 2006

Consider the reaction represented by the equation: 2SO\(_{2(g)}\) + O\(_{2(g)}\) ⇌ 2SO\(_{3(g)}\); ∆H = - 197 kJmol\(^{-1}\). Which of the following conditions will not increase the yield of sulphur (VI) oxide?

A. Increase in temperature
B. Decrease in temperature
C. Increase in pressure
D. Addition of O₂ into the mixture

Question 15:

• WAEC 2006

Electrolysis is applied in the following processes except

A. Electroplating
B. Extraction of aluminium
C. Extraction of iron
D. Purification of copper