Year :
2003
Title :
Chemistry
Exam :
NECO - BECE
Paper 1 | Objectives
1 - 10 of 38 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
Which statement is NOT true about the composition of starch? A. It contains only the atoms of carbon, hydrogen oxygen B. It is a polysaccharide C. Its empirical formula is C2H20. D. It is made from the monomerC6H12O6. E. The hydrogen and oxygen atoms are in the ratio 2:1. |
C |
| 2. |
Chlorine is used in water purification because it A. bleaches impurities in the water B. decolorizes water C. destroys bacteria D. is extremely soluble in water E. is pleasant tasting |
C |
| 3. |
The number of hydrogen ions in 1.0dm6.00x103 of a 0.25 mole dm6.00x10-3 tetraoxosulphate(Vl) acid solution is A. 1.45x1023 B. 1.50 x l023 C. 3.00x1023 D. 3.15x1023 E. 6.00x1023 |
B |
| 4. |
B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has A. 46 protons and 119 neutrons B. 92 protons and 92 neutrons C. 92 protons and 146 neutrons D. 92 protons and 238 neutrons |
C |
| 5. |
The boiling point of water is higher than the boiling point of ethanol because A. the bonding in water is electrovalent (ionic) whereas the bonding in ethanol is convalent B. the hydrogen bonding between water molecules is stronger than the hydrogen bonding between ethanol molecules C. water has a higher lattice energy than ethanol. D. water has hydrogen bonding between its molecules but ethanol has no hydrogen bonging between its molecules; E. water is a better solvent than ethanol. |
B |
| 6. |
The reaction C2H6 → C2H + H2 is known as A. dehydration B. dehydrogenation C. displacement D. hydrogenation E. reduction |
B |
| 7. |
Which is NOT a synthetic polymer? A. nylon B. Orion C. Perspex D. polystyrene E. wool |
E |
| 8. |
A calcium atom and a calcium ion have the same A. chemical properties B. electric charge C. electronic structure D. number of electrons E. number of neutrons |
E |
| 9. |
Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid? A. CH3CH2CHO B. CH3CH2CH2OH C. CH3CH2COQH D. CH3CH20CH E. CH3CH3OH |
B |
| 10. |
Which formula is used to indicate the degree of acidity of an acid? A. \( [H^+] = ^{\text{mass of acid relative}} molecular mass of acid \) B. F = number of H+ = ions x molar mass of the acid C. Kw = [H+][OH-] D. pH = - log10[H+] E. pKa = -log10Ka |
D |
| 1. |
Which statement is NOT true about the composition of starch? A. It contains only the atoms of carbon, hydrogen oxygen B. It is a polysaccharide C. Its empirical formula is C2H20. D. It is made from the monomerC6H12O6. E. The hydrogen and oxygen atoms are in the ratio 2:1. |
C |
| 2. |
Chlorine is used in water purification because it A. bleaches impurities in the water B. decolorizes water C. destroys bacteria D. is extremely soluble in water E. is pleasant tasting |
C |
| 3. |
The number of hydrogen ions in 1.0dm6.00x103 of a 0.25 mole dm6.00x10-3 tetraoxosulphate(Vl) acid solution is A. 1.45x1023 B. 1.50 x l023 C. 3.00x1023 D. 3.15x1023 E. 6.00x1023 |
B |
| 4. |
B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has A. 46 protons and 119 neutrons B. 92 protons and 92 neutrons C. 92 protons and 146 neutrons D. 92 protons and 238 neutrons |
C |
| 5. |
The boiling point of water is higher than the boiling point of ethanol because A. the bonding in water is electrovalent (ionic) whereas the bonding in ethanol is convalent B. the hydrogen bonding between water molecules is stronger than the hydrogen bonding between ethanol molecules C. water has a higher lattice energy than ethanol. D. water has hydrogen bonding between its molecules but ethanol has no hydrogen bonging between its molecules; E. water is a better solvent than ethanol. |
B |
| 6. |
The reaction C2H6 → C2H + H2 is known as A. dehydration B. dehydrogenation C. displacement D. hydrogenation E. reduction |
B |
| 7. |
Which is NOT a synthetic polymer? A. nylon B. Orion C. Perspex D. polystyrene E. wool |
E |
| 8. |
A calcium atom and a calcium ion have the same A. chemical properties B. electric charge C. electronic structure D. number of electrons E. number of neutrons |
E |
| 9. |
Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid? A. CH3CH2CHO B. CH3CH2CH2OH C. CH3CH2COQH D. CH3CH20CH E. CH3CH3OH |
B |
| 10. |
Which formula is used to indicate the degree of acidity of an acid? A. \( [H^+] = ^{\text{mass of acid relative}} molecular mass of acid \) B. F = number of H+ = ions x molar mass of the acid C. Kw = [H+][OH-] D. pH = - log10[H+] E. pKa = -log10Ka |
D |