Waec Chemistry 2004 Past Questions and Answers

Question 26:

• WAEC 2004

What of the following pairs of acid and base will produce a solution with pH less than 7 at equivalence point?

A. HNO₃ and NaOH
B. H₂SO₄ and KOH
C. HCI and Mg(OH) ₂
D. HNO ₃ and KOH

Question 27:

• WAEC 2004

WHICH OF THE FOLLOWING SALTS IS READILY SOLUBLE IN WATER?

A. PbCI₂
B. Pb(NO ₃) ₂
C. PbSO₄
D. PbCO ₃

Question 28:

• WAEC 2004

Which of the following factors that affect the rate of chemical reactions can be explained in terms of the collision theory? l. concentration ll. pressure lll. temperature lV catalyst

A. L and ll only
B. L, ll and lll only
C. L and lll only
D. L, lll and IV only

Question 29:

• WAEC 2004

An orange drink concentrate is suspected to contain traces of poisonous green dye and a harmless dye having the same boiling point. Which of the following techniques is most suitable for isolating the dyes?

A. Fractional distillation
B. Paper chromatography
C. Coagulation
D. Recrystallization

Question 30:

• WAEC 2004

If 60 cm³ of gas is heated from 27^oC TO 50^oC, what is the new volume of the gas at constant pressure?

A. 32.4cm ³
B. 55.7cm³
C. 64.6cm³
D. 111.1cm³