Year :
1983
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
1 - 10 of 50 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
X is a crystalline salt of sodium solution of X in water turns litmus red and produces a gas which turns lime water milky when added to sodium carbonate. With barium chloride solution, X gives hydrochloric acid. X is A. Na 2CO 3 B. NaHCO 3 C. NaHSO 4 D. Na 2SO 4 |
C |
| 2. |
The alkanol obtained from the production of soap is A. ethanol B. glycerol C. methanol D. propanol E. glycol |
B |
| 3. |
The flame used by welders in cutting metals is A. butane gas flame B. acetylene flame C. kerosene flame D. oxy-acetylene flame E. oxygen flame |
D |
| 4. |
Consecutive members of an alkane homologous serires differ by A. CH B. CH2 C. CH3 D. CnHn E. CnH |
B |
| 5. |
If an element has the electronic configuration 1s 2 2s2 2p3 3s2 3p4, it is A. a metal B. an alkaline earth metal C. an s-block element D. a p-Block element E. a transition element |
D |
| 6. |
Some copper (ll) sulphate pentahydrate (CuSO4 5H2O), was heated at 120 oC with the following results. Wt of crucible = 10.00 g; Wt of crucible + CuSO4 5H2O =14.98g; Wt of crucible + residue = 13.54 g. How many molecules of water of crystalization were lost? A. 1 B. 2 C. 3 D. 4 E. 5 Detailed SolutionCuSO4 + 5H 2OWt CuSO4 + 5H2O = 14.98 - 10.00 = 4.98 gm Wt of residue or CuSO4 = 13.54 - 10.00 =3.54 Wt of water lost = 4.98 - 3.54 = 1.44 Molecules of H2O lost = 5 - 1 = 4 |
|
| 7. |
The three-dimensional shape of methane is A. hexagonal B. trigonal C. linear D. tetrahedral E. cubical |
D |
| 8. |
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a swe A. a soap B. an oil C. an alkane D. an ester E. sucrose |
D |
| 9. |
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a swe A. C12H22O11 B. C6H12O6 C. C3H6O 3 D. C7H14O7 E. C12H6O4 |
B |
| 10. |
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a swe A. plastic industry B. textile industry C. brewing industry D. soap industry E. dyeing industry |
C |
| 1. |
X is a crystalline salt of sodium solution of X in water turns litmus red and produces a gas which turns lime water milky when added to sodium carbonate. With barium chloride solution, X gives hydrochloric acid. X is A. Na 2CO 3 B. NaHCO 3 C. NaHSO 4 D. Na 2SO 4 |
C |
| 2. |
The alkanol obtained from the production of soap is A. ethanol B. glycerol C. methanol D. propanol E. glycol |
B |
| 3. |
The flame used by welders in cutting metals is A. butane gas flame B. acetylene flame C. kerosene flame D. oxy-acetylene flame E. oxygen flame |
D |
| 4. |
Consecutive members of an alkane homologous serires differ by A. CH B. CH2 C. CH3 D. CnHn E. CnH |
B |
| 5. |
If an element has the electronic configuration 1s 2 2s2 2p3 3s2 3p4, it is A. a metal B. an alkaline earth metal C. an s-block element D. a p-Block element E. a transition element |
D |
| 6. |
Some copper (ll) sulphate pentahydrate (CuSO4 5H2O), was heated at 120 oC with the following results. Wt of crucible = 10.00 g; Wt of crucible + CuSO4 5H2O =14.98g; Wt of crucible + residue = 13.54 g. How many molecules of water of crystalization were lost? A. 1 B. 2 C. 3 D. 4 E. 5 Detailed SolutionCuSO4 + 5H 2OWt CuSO4 + 5H2O = 14.98 - 10.00 = 4.98 gm Wt of residue or CuSO4 = 13.54 - 10.00 =3.54 Wt of water lost = 4.98 - 3.54 = 1.44 Molecules of H2O lost = 5 - 1 = 4 |
|
| 7. |
The three-dimensional shape of methane is A. hexagonal B. trigonal C. linear D. tetrahedral E. cubical |
D |
| 8. |
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a swe A. a soap B. an oil C. an alkane D. an ester E. sucrose |
D |
| 9. |
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a swe A. C12H22O11 B. C6H12O6 C. C3H6O 3 D. C7H14O7 E. C12H6O4 |
B |
| 10. |
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a swe A. plastic industry B. textile industry C. brewing industry D. soap industry E. dyeing industry |
C |