Year :
2001
Title :
Chemistry
Exam :
NECO - BECE
Paper 1 | Objectives
1 - 10 of 41 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
20 cm3 of 0.09 mol dm3 solution of tetraoxosuiphate (Vi) acid requires 30cm3 of sodium hydroxide solution for complete neutralization. The molar concentration of sodium hydroxide is [H = 1; S = 32; 0 = 16; Na = 23] A. 0.03 mol dm3 B. 0.12 mol dm3 C. 0.27 mol dm3 D. 0.45 mol dm3 E. 0.90 mol dm3 |
B |
| 2. |
The decreasing order of the oxidising power of the halogens is A. Br>I>Cl>F B. F>I>Cl>Br C. F>Cl>Br>l D. I>Br>Cl>F E. Cl>Br>F>I |
C |
| 3. |
Which statement BEST describes the process of oxidation? A. addition of hydrogen B. loss of oxygen C. decrease in oxidation number D. loss of electrons E. gain of elections. |
D |
| 4. |
Animal charcoal differs from wood charcoal in that it A. has a dark colour B. has a high carbon content C. is a good absorbent D. is crystalline. E. is rich in phosphate content Detailed SolutionAnimal charcoal or bone black is the carbonaceous residue obtained by the dry distillation of bones. It contains only about 10% carbon, the remaining being calcium and magnesium phosphates (80%) and other inorganic material originally present in the bones. |
|
| 5. |
The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is A. 1 B. 2 C. 3 D. 4 E. 5 Detailed Solution-There are 4 unpaired electrons in Fe-However; 5 unpaired electrons are present in Fe3+ |
|
| 6. |
The use of sulphur to vulcanize rubber is mad to make it A. blacker. B. . C. more elastic D. tougher E. softer. |
D |
| 7. |
Which element contains the greatest number of moles? A. 8 g of Helium B. 48 g of Carbon C. 78 g of Potassium D. 130g of Zinc E. 216g of Sliver |
B |
| 8. |
The position of an element in the Periodic Table is determined by A. its atomic radius. B. its density. C. its relative atomic mass. D. the number of protons in its atom. E. the number of neutrons in its atoms |
D |
| 9. |
What dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \) A. Artificial radioactivity B. nuclear fission C. nuclear fusion D. radio-decomposition E. spontaneous disintegration |
E |
| 10. |
Which compound can be used as a reducing agent in a reaction? A. Cl2 B. KMnO4 C. KCr2O7 D. MnO2 E. Na2SO3 |
E |
| 1. |
20 cm3 of 0.09 mol dm3 solution of tetraoxosuiphate (Vi) acid requires 30cm3 of sodium hydroxide solution for complete neutralization. The molar concentration of sodium hydroxide is [H = 1; S = 32; 0 = 16; Na = 23] A. 0.03 mol dm3 B. 0.12 mol dm3 C. 0.27 mol dm3 D. 0.45 mol dm3 E. 0.90 mol dm3 |
B |
| 2. |
The decreasing order of the oxidising power of the halogens is A. Br>I>Cl>F B. F>I>Cl>Br C. F>Cl>Br>l D. I>Br>Cl>F E. Cl>Br>F>I |
C |
| 3. |
Which statement BEST describes the process of oxidation? A. addition of hydrogen B. loss of oxygen C. decrease in oxidation number D. loss of electrons E. gain of elections. |
D |
| 4. |
Animal charcoal differs from wood charcoal in that it A. has a dark colour B. has a high carbon content C. is a good absorbent D. is crystalline. E. is rich in phosphate content Detailed SolutionAnimal charcoal or bone black is the carbonaceous residue obtained by the dry distillation of bones. It contains only about 10% carbon, the remaining being calcium and magnesium phosphates (80%) and other inorganic material originally present in the bones. |
|
| 5. |
The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is A. 1 B. 2 C. 3 D. 4 E. 5 Detailed Solution-There are 4 unpaired electrons in Fe-However; 5 unpaired electrons are present in Fe3+ |
| 6. |
The use of sulphur to vulcanize rubber is mad to make it A. blacker. B. . C. more elastic D. tougher E. softer. |
D |
| 7. |
Which element contains the greatest number of moles? A. 8 g of Helium B. 48 g of Carbon C. 78 g of Potassium D. 130g of Zinc E. 216g of Sliver |
B |
| 8. |
The position of an element in the Periodic Table is determined by A. its atomic radius. B. its density. C. its relative atomic mass. D. the number of protons in its atom. E. the number of neutrons in its atoms |
D |
| 9. |
What dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \) A. Artificial radioactivity B. nuclear fission C. nuclear fusion D. radio-decomposition E. spontaneous disintegration |
E |
| 10. |
Which compound can be used as a reducing agent in a reaction? A. Cl2 B. KMnO4 C. KCr2O7 D. MnO2 E. Na2SO3 |
E |