Year :
2009
Title :
Chemistry
Exam :
NECO - BECE
Paper 1 | Objectives
1 - 10 of 47 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is A. ammonia B. carbon(IV)oxide C. hydrogen chloride D. sulphur (IV) oxide E. sulphur (VI) oxide |
A |
| 2. |
Which of the following equations is NOT balanced? A. CH4(g) + 202(9) → CO2(g) + 2H2O(g) B. CU(S) + HNO3(aq) → Cu(NO3)2(aq) + 4H2O(I) + NO(g) C. 2KCIO3(s) → 2KCI(s)+ 3O2(g) D. NaH(s) + H2O(1) → NaOH(aq) +H2(g) E. Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq) |
B |
| 3. |
The process involved in the decomposition of sugar by an enzyme is called A. dehydration B. esterification C. fermentation D. polymerization E. saponification |
C |
| 4. |
Compound with the general formula CnH2n2 belong to the_______ group A. alkanal B. alkane C. alkanoate D. alkene E. alkyne |
E |
| 5. |
Which of the following non-metals reacts most readily with metals? A. Carbon B. Chlorine C. Nitrogen D. Phosphorus E. Sulphur |
B |
| 6. |
The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12] A. CH B. CH3 C. CH4 D. C2H2 E. C2H6 Detailed SolutionRelative No of Moles for Carbon = 79.2% ÷ 12 = 6.6Relative No of Moles for Hydrogen = 20.8% ÷ 1 = 20.8 Ratio of Moles = Carbon 6.6 ÷ 6.6 = 1 Hydrogen = 20.8 ÷ 6.6 ~ 3 EMPIRICAL FORMULA IS CH\(_3\) |
|
| 7. |
The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT A. HOCH2 – CH2OH B. H2C –C =C– CH3 C. H3C – HC = CH2 D. H2C = CH2 E. H3C – C =CH |
A |
| 8. |
The scientist who discovered the zig-zag movement of gas molecules is A. Brownian B. Dalton C. Gay Lussac D. Graham E. Newton |
A |
| 9. |
Which of the following is NOT a fraction of petroleum? A. Bitumen B. Coal C. Diesel D. Kerosene E. Petrol |
B |
| 10. |
Which of the following statements is NOT correct of group VII elements? They A. are diatomic B. are good oxidizing agents C. are highly electronegative D. have high electron affinity E. have relatively low ionization potentials |
E |
| 1. |
A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is A. ammonia B. carbon(IV)oxide C. hydrogen chloride D. sulphur (IV) oxide E. sulphur (VI) oxide |
A |
| 2. |
Which of the following equations is NOT balanced? A. CH4(g) + 202(9) → CO2(g) + 2H2O(g) B. CU(S) + HNO3(aq) → Cu(NO3)2(aq) + 4H2O(I) + NO(g) C. 2KCIO3(s) → 2KCI(s)+ 3O2(g) D. NaH(s) + H2O(1) → NaOH(aq) +H2(g) E. Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq) |
B |
| 3. |
The process involved in the decomposition of sugar by an enzyme is called A. dehydration B. esterification C. fermentation D. polymerization E. saponification |
C |
| 4. |
Compound with the general formula CnH2n2 belong to the_______ group A. alkanal B. alkane C. alkanoate D. alkene E. alkyne |
E |
| 5. |
Which of the following non-metals reacts most readily with metals? A. Carbon B. Chlorine C. Nitrogen D. Phosphorus E. Sulphur |
B |
| 6. |
The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12] A. CH B. CH3 C. CH4 D. C2H2 E. C2H6 Detailed SolutionRelative No of Moles for Carbon = 79.2% ÷ 12 = 6.6Relative No of Moles for Hydrogen = 20.8% ÷ 1 = 20.8 Ratio of Moles = Carbon 6.6 ÷ 6.6 = 1 Hydrogen = 20.8 ÷ 6.6 ~ 3 EMPIRICAL FORMULA IS CH\(_3\) |
|
| 7. |
The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT A. HOCH2 – CH2OH B. H2C –C =C– CH3 C. H3C – HC = CH2 D. H2C = CH2 E. H3C – C =CH |
A |
| 8. |
The scientist who discovered the zig-zag movement of gas molecules is A. Brownian B. Dalton C. Gay Lussac D. Graham E. Newton |
A |
| 9. |
Which of the following is NOT a fraction of petroleum? A. Bitumen B. Coal C. Diesel D. Kerosene E. Petrol |
B |
| 10. |
Which of the following statements is NOT correct of group VII elements? They A. are diatomic B. are good oxidizing agents C. are highly electronegative D. have high electron affinity E. have relatively low ionization potentials |
E |