Year :
2003
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
11 - 20 of 37 Questions
| # | Question | Ans |
|---|---|---|
| 11. |
What term is used to describe an oxide whose aqueous solution turns blue litmus red? A. Strong electrolyte B. Acid anhydride C. Amphoteric oxide D. Basic oxide |
B |
| 12. |
The pH of 0.50 mol dm-3 solutions of HCI, H2SO4 and CH3COOH were measured. which of the following statements about the values obtained is correct? A. the pH value was equal to 5 in each case B. the pH values of the HCI and H2SO4 solutions were equal C. their pH values added uo to 14 D. the pH value of the CH3COOH was the highest. |
D |
| 13. |
Which of the following processes involves neutralization? A. Hardening of oils B. Souring of milk C. Charring of sugar D. Liming of soil |
D |
| 14. |
Sea shells contain mainly CaCO 3. Calcium oxide can be prepared from sea shells by A. adding dilute acid B. heating at a high temperature C. reduction with CO D. adding dilute NaOH(aq) |
B |
| 15. |
Which of the following statements about an exothermic reaction is correct? A. the products have less heat content than reactants B. the system absorbs heat from the surrounding C. the activation energy is high D. the enthalpy change is positive |
A |
| 16. |
A reducing agent is expected to A. decolourize acidified KMnO4 solution B. decolourize acidified FeSO4 solution C. liberate CI2 from a chloride D. liberate CO2 from NaHCO3 |
A |
| 17. |
Consider the electrochemical cell represented below Zn(s)/Zn2+(aq)//Cu2+(aq)/Cu(s). Which of the following equations describes the reaction occurring in the cell? A. Cu(s) + Zn2+(aq) →Cu2+(aq) + Zn(s) B. Cu(s) + Zn(s) →Cu2+(aq) + Zn2+(aq) C. Zn(s) + Cu2+(aq) →Zn2+(aq) + Cu(s) D. Zn2+(aq) +Cu2+(aq) → Zn(s) + Cu(s) |
C |
| 18. |
Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z. A. V B. W C. X D. Z |
D |
| 19. |
Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z. A. V B. W C. X D. Z |
A |
| 20. |
Which of the following statements is/are correct about tin plating? l The electrolyte must be a soluble salt of tin ll. the objective to be plated is made the cathode lll. The anode is made of tin lV. The negative electrode dissolves A. L only B. l and ll only C. l,ll and lll only D. l, ll and lV only |
C |
| 11. |
What term is used to describe an oxide whose aqueous solution turns blue litmus red? A. Strong electrolyte B. Acid anhydride C. Amphoteric oxide D. Basic oxide |
B |
| 12. |
The pH of 0.50 mol dm-3 solutions of HCI, H2SO4 and CH3COOH were measured. which of the following statements about the values obtained is correct? A. the pH value was equal to 5 in each case B. the pH values of the HCI and H2SO4 solutions were equal C. their pH values added uo to 14 D. the pH value of the CH3COOH was the highest. |
D |
| 13. |
Which of the following processes involves neutralization? A. Hardening of oils B. Souring of milk C. Charring of sugar D. Liming of soil |
D |
| 14. |
Sea shells contain mainly CaCO 3. Calcium oxide can be prepared from sea shells by A. adding dilute acid B. heating at a high temperature C. reduction with CO D. adding dilute NaOH(aq) |
B |
| 15. |
Which of the following statements about an exothermic reaction is correct? A. the products have less heat content than reactants B. the system absorbs heat from the surrounding C. the activation energy is high D. the enthalpy change is positive |
A |
| 16. |
A reducing agent is expected to A. decolourize acidified KMnO4 solution B. decolourize acidified FeSO4 solution C. liberate CI2 from a chloride D. liberate CO2 from NaHCO3 |
A |
| 17. |
Consider the electrochemical cell represented below Zn(s)/Zn2+(aq)//Cu2+(aq)/Cu(s). Which of the following equations describes the reaction occurring in the cell? A. Cu(s) + Zn2+(aq) →Cu2+(aq) + Zn(s) B. Cu(s) + Zn(s) →Cu2+(aq) + Zn2+(aq) C. Zn(s) + Cu2+(aq) →Zn2+(aq) + Cu(s) D. Zn2+(aq) +Cu2+(aq) → Zn(s) + Cu(s) |
C |
| 18. |
Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z. A. V B. W C. X D. Z |
D |
| 19. |
Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z. A. V B. W C. X D. Z |
A |
| 20. |
Which of the following statements is/are correct about tin plating? l The electrolyte must be a soluble salt of tin ll. the objective to be plated is made the cathode lll. The anode is made of tin lV. The negative electrode dissolves A. L only B. l and ll only C. l,ll and lll only D. l, ll and lV only |
C |