Year :
2004
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
21 - 30 of 42 Questions
| # | Question | Ans |
|---|---|---|
| 21. |
What is the IUPAC name of CH3CH2COOCH 3? A. Ethylethanoate B. Methylethanoate C. Methylpropanoate D. Propylmethanoate |
C |
| 22. |
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 Detailed SolutionThe mass of 0.8dm3 of a gas at s.t.p. is 1.0g :. 22.4dm> of gas at s.t.p. will have a molar mass of 22.4/0.8 = 28.0g mol-1 |
|
| 23. |
Which of the following compounds is a soapless detergent? A. C 12H 25OSO3Na B. C 17H 35COONa C. C 6H5OH3 D. C 4H9COOC2H 5 |
A |
| 24. |
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- → H2(g) B. Na+2(g) + e- → Na(s) C. 4OH- → 2H2O(l) + O2(g) +4e- D. 2CI- → CI2(g) + 2e- |
A |
| 25. |
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 |
C |
| 26. |
WHICH OF THE FOLLOWING SALTS IS READILY SOLUBLE IN WATER? A. PbCI2 B. Pb(NO 3) 2 C. PbSO4 D. PbCO 3 |
B |
| 27. |
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, II, lll and IV only Detailed SolutionThe factors that affect reaction rates are: |
|
| 28. |
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 |
B |
| 29. |
If 60 cm3 of gas is heated from 27oC TO 50oC, what is the new volume of the gas at constant pressure? A. 32.4cm 3 B. 55.7cm3 C. 64.6cm3 D. 111.1cm3 Detailed SolutionV1 = 60cmT2 = 273 + 50 = 323KV2 = ? V1/T1 = V2/T2 .: V2 = V1T 2/T1 = 60 x 323/300 = 19380/300 = 64.6cm3 |
|
| 30. |
Consider the cell represented below: Zn/Zn2+(aq) // Cu2+(aq) / Cu(s). Which of the following statements is correct about the cell A. Zn is oxidized to Zn2+ B. Cu is oxidized to Cu2+ C. It is an electrolytic cell D. each single line represents a salt bridge |
A |
| 21. |
What is the IUPAC name of CH3CH2COOCH 3? A. Ethylethanoate B. Methylethanoate C. Methylpropanoate D. Propylmethanoate |
C |
| 22. |
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 Detailed SolutionThe mass of 0.8dm3 of a gas at s.t.p. is 1.0g :. 22.4dm> of gas at s.t.p. will have a molar mass of 22.4/0.8 = 28.0g mol-1 |
|
| 23. |
Which of the following compounds is a soapless detergent? A. C 12H 25OSO3Na B. C 17H 35COONa C. C 6H5OH3 D. C 4H9COOC2H 5 |
A |
| 24. |
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- → H2(g) B. Na+2(g) + e- → Na(s) C. 4OH- → 2H2O(l) + O2(g) +4e- D. 2CI- → CI2(g) + 2e- |
A |
| 25. |
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 |
C |
| 26. |
WHICH OF THE FOLLOWING SALTS IS READILY SOLUBLE IN WATER? A. PbCI2 B. Pb(NO 3) 2 C. PbSO4 D. PbCO 3 |
B |
| 27. |
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, II, lll and IV only Detailed SolutionThe factors that affect reaction rates are: |
|
| 28. |
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 |
B |
| 29. |
If 60 cm3 of gas is heated from 27oC TO 50oC, what is the new volume of the gas at constant pressure? A. 32.4cm 3 B. 55.7cm3 C. 64.6cm3 D. 111.1cm3 Detailed SolutionV1 = 60cmT2 = 273 + 50 = 323KV2 = ? V1/T1 = V2/T2 .: V2 = V1T 2/T1 = 60 x 323/300 = 19380/300 = 64.6cm3 |
|
| 30. |
Consider the cell represented below: Zn/Zn2+(aq) // Cu2+(aq) / Cu(s). Which of the following statements is correct about the cell A. Zn is oxidized to Zn2+ B. Cu is oxidized to Cu2+ C. It is an electrolytic cell D. each single line represents a salt bridge |
A |