Year :
2008
Title :
Chemistry
Exam :
NECO - BECE
Paper 1 | Objectives
31 - 40 of 42 Questions
| # | Question | Ans |
|---|---|---|
| 31. |
The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces A. calcium chloride, carbon (IV) oxide and water B. calcium chloride, and trioxocarbonate (IV) acid C. calcium hydroxide, carbon (IV) oxide and chlorine gas D. calcium hydroxide, carbon (IV) oxide and water E. calcium metal and water. |
A |
| 32. |
If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula A. XZ B. XZ2 C. X2Z D. X2Z3 E. X3Z2 |
D |
| 33. |
The following gases are diatomic EXCEPT A. Fluorine B. Helium C. Hydrogen D. Nitrogen E. Oxygen |
B |
| 34. |
Which of these is NOT a physical property f water? A. Can be used to dissolve organic substances B. Has a boiling point of 100 ° C C. Has a density of 19cm3 at 40 °C D. Has a freezing point of 0 ° C E. is neutral to litmus |
A |
| 35. |
During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because A. hydrogen ions are in greater concentration than sodium ions. B. hydrogen is higher than sodium in the electrochemical series. C. hydrogen is lower than sodium in the electrochemical series. D. of the nature of the electrodes. E. the concentration of sodium ions is greater than that of the hydrogen ion in the electrolyte. |
C |
| 36. |
Chromatography is used to separate components of mixtures which differ in their rates of A. diffusion B. migration C. reaction D. sedimentation E. sublimation. |
B |
| 37. |
The electrode potential in volts of 2H+(aq) / H2(q) system is A. -2.87 B. -2.71 C. 0.8 D. 1.68 E. \( 0 \) |
E |
| 38. |
A substance is said to be hygroscopic when it A. absorbs atmospheric moisture and then goes into solution B. absorbs atmospheric moisture but does not go into solution C. changes colour D. is not affected by atmospheric moisture E. losses its water of crystallization |
B |
| 39. |
A measure of the degree of disorderliness in a chemical system is known as the A. activation energy B. enthalpy C. entropy D. equilibrium E. free energy. |
C |
| 40. |
What is the maximum number of electrons that an f-orbital can accommodate? A. 2 B. 6 C. 7 D. 10 E. 14 |
E |
| 31. |
The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces A. calcium chloride, carbon (IV) oxide and water B. calcium chloride, and trioxocarbonate (IV) acid C. calcium hydroxide, carbon (IV) oxide and chlorine gas D. calcium hydroxide, carbon (IV) oxide and water E. calcium metal and water. |
A |
| 32. |
If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula A. XZ B. XZ2 C. X2Z D. X2Z3 E. X3Z2 |
D |
| 33. |
The following gases are diatomic EXCEPT A. Fluorine B. Helium C. Hydrogen D. Nitrogen E. Oxygen |
B |
| 34. |
Which of these is NOT a physical property f water? A. Can be used to dissolve organic substances B. Has a boiling point of 100 ° C C. Has a density of 19cm3 at 40 °C D. Has a freezing point of 0 ° C E. is neutral to litmus |
A |
| 35. |
During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because A. hydrogen ions are in greater concentration than sodium ions. B. hydrogen is higher than sodium in the electrochemical series. C. hydrogen is lower than sodium in the electrochemical series. D. of the nature of the electrodes. E. the concentration of sodium ions is greater than that of the hydrogen ion in the electrolyte. |
C |
| 36. |
Chromatography is used to separate components of mixtures which differ in their rates of A. diffusion B. migration C. reaction D. sedimentation E. sublimation. |
B |
| 37. |
The electrode potential in volts of 2H+(aq) / H2(q) system is A. -2.87 B. -2.71 C. 0.8 D. 1.68 E. \( 0 \) |
E |
| 38. |
A substance is said to be hygroscopic when it A. absorbs atmospheric moisture and then goes into solution B. absorbs atmospheric moisture but does not go into solution C. changes colour D. is not affected by atmospheric moisture E. losses its water of crystallization |
B |
| 39. |
A measure of the degree of disorderliness in a chemical system is known as the A. activation energy B. enthalpy C. entropy D. equilibrium E. free energy. |
C |
| 40. |
What is the maximum number of electrons that an f-orbital can accommodate? A. 2 B. 6 C. 7 D. 10 E. 14 |
E |