Year :
1999
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
11 - 20 of 42 Questions
| # | Question | Ans |
|---|---|---|
| 11. |
The crystal layers in graphite are held together by A. electrostatic forces B. van der Waals' forces C. hydrogen bonds D. covalent bonds |
D |
| 12. |
Which of the following compounds has the highest ionic character? A. PCI5 B. SiCI4 C. AICI3 D. KCI |
D |
| 13. |
If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly A. covalent B. ionic C. dative D. metallic |
B |
| 14. |
One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16] A. 122 B. 101 C. 53 D. 40 Detailed SolutionOne of the mole of M(HCO3)2 = 162g; M +(1 + 12 + 16 x 3) x 2 = 162; M +122 = 162,:. M = 162 - 122 = 40g |
|
| 15. |
Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of A. diffusion B. combustion C. absorption D. emission |
A |
| 16. |
Which of the following movements can be described as random motion? A. wheelbarrow being pushed B. car travelling on a straight line C. Gas molecules colliding in a flask D. Planets going round the sun |
C |
| 17. |
Equal volumes of CO2 cnd CO at s.t.p have the same A. mass B. density C. rate of diffusion D. number of molecules |
D |
| 18. |
Gas molecules are said to be perfectly elastic because A. they collide without loss of energy B. they move about in straight lines C. the distances between them are negligible D. the volume occupied by them is negligible |
A |
| 19. |
What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p] A. 0.040dm 3 B. 0.896dm 3 C. 5.82dm 3 D. 8.62dm 3 Detailed SolutionZn + 2HCI → ZnCI2 + H2; 65g of Zn produces 22.4 dm3 of H2; .: 2.6g of Zn will produce = 2.6/65 x 22.4 = 0.896 dm3 |
|
| 20. |
Helium is preferred to hydrogen in filling balloons because hydrogen A. is inflammable B. is diatomic C. exhibits isotopy D. is a component of water Detailed SolutionHelium is a colorless, non-toxic, non-flammable gas that is lighter than air. When balloons are filled with helium, they will float. |
| 11. |
The crystal layers in graphite are held together by A. electrostatic forces B. van der Waals' forces C. hydrogen bonds D. covalent bonds |
D |
| 12. |
Which of the following compounds has the highest ionic character? A. PCI5 B. SiCI4 C. AICI3 D. KCI |
D |
| 13. |
If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly A. covalent B. ionic C. dative D. metallic |
B |
| 14. |
One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16] A. 122 B. 101 C. 53 D. 40 Detailed SolutionOne of the mole of M(HCO3)2 = 162g; M +(1 + 12 + 16 x 3) x 2 = 162; M +122 = 162,:. M = 162 - 122 = 40g |
|
| 15. |
Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of A. diffusion B. combustion C. absorption D. emission |
A |
| 16. |
Which of the following movements can be described as random motion? A. wheelbarrow being pushed B. car travelling on a straight line C. Gas molecules colliding in a flask D. Planets going round the sun |
C |
| 17. |
Equal volumes of CO2 cnd CO at s.t.p have the same A. mass B. density C. rate of diffusion D. number of molecules |
D |
| 18. |
Gas molecules are said to be perfectly elastic because A. they collide without loss of energy B. they move about in straight lines C. the distances between them are negligible D. the volume occupied by them is negligible |
A |
| 19. |
What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p] A. 0.040dm 3 B. 0.896dm 3 C. 5.82dm 3 D. 8.62dm 3 Detailed SolutionZn + 2HCI → ZnCI2 + H2; 65g of Zn produces 22.4 dm3 of H2; .: 2.6g of Zn will produce = 2.6/65 x 22.4 = 0.896 dm3 |
|
| 20. |
Helium is preferred to hydrogen in filling balloons because hydrogen A. is inflammable B. is diatomic C. exhibits isotopy D. is a component of water Detailed SolutionHelium is a colorless, non-toxic, non-flammable gas that is lighter than air. When balloons are filled with helium, they will float. |