Year :
1994
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
1 - 10 of 36 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
The components of universal indicator solution can best be separated by A. chromatography B. filtration C. evaporation D. crystallization E. fractional distillation |
A |
| 2. |
The number of replaceable hydrogen atoms in one acid indicates its A. basicity B. acidity C. alkalinity D. reactivity E. pH value |
A |
| 3. |
Catalytic hydrogenation of alkenes produces compounds with the general formula A. CnH2n+1 OH B. CnH2n+1 C. CnH2n+2 D. CnH2n-2 E. Cx(H2O)y Detailed Solution.In a hydrogenation reaction, two hydrogen atoms are added across the double bond of an alkene, resulting in a saturated alkane. |
|
| 4. |
A measure of the degree of disorder in a chemical system is known as the A. enthalpy B. free energy C. activation energy D. entrophy E. equilibrium |
D |
| 5. |
In any chemical reaction, the total mass of the products is always equal to that of the reactants. This is statement of the law of A. definite proportion B. conservation of matter C. multiple proportions D. reciprocal proportions E. constant composition |
B |
| 6. |
Which of the following is not a property of magnesium oxide? A. High melting point B. Dissolution in polar solvents C. Presence of ionic bonds D. Possession of crystal lattice E. Low binding energy |
E |
| 7. |
Which of the following would increase the rate of reaction of chips of a metal M as shown in the equation below? M(s) + 2HCI(aq) → MCI2(aq) + H2(g) A. Diluting the hydrochloric acid B. Adding some distilled water C. Decreasing the temperature D. Grinding the metal into powder E. Increasing the pressure |
D |
| 8. |
The oxidation number of phosphorus in PO 3/4 is A. + 1 B. +2 C. +3 D. +4 E. +5 |
E |
| 9. |
The number of atoms in 1.2g of carbon - 12 isotope is A. 1.00 x 10 22 B. 6.02 x 1022 C. 1.20 x 10 23 D. 1.00 x 1023 E. 6.02 x 1024 |
B |
| 10. |
Tetraoxosulphate (lV) acid is described as strong acid because it is highly A. corrosive B. concentrated C. reactive D. soluble in water E. ionized in water |
E |
| 1. |
The components of universal indicator solution can best be separated by A. chromatography B. filtration C. evaporation D. crystallization E. fractional distillation |
A |
| 2. |
The number of replaceable hydrogen atoms in one acid indicates its A. basicity B. acidity C. alkalinity D. reactivity E. pH value |
A |
| 3. |
Catalytic hydrogenation of alkenes produces compounds with the general formula A. CnH2n+1 OH B. CnH2n+1 C. CnH2n+2 D. CnH2n-2 E. Cx(H2O)y Detailed Solution.In a hydrogenation reaction, two hydrogen atoms are added across the double bond of an alkene, resulting in a saturated alkane. |
|
| 4. |
A measure of the degree of disorder in a chemical system is known as the A. enthalpy B. free energy C. activation energy D. entrophy E. equilibrium |
D |
| 5. |
In any chemical reaction, the total mass of the products is always equal to that of the reactants. This is statement of the law of A. definite proportion B. conservation of matter C. multiple proportions D. reciprocal proportions E. constant composition |
B |
| 6. |
Which of the following is not a property of magnesium oxide? A. High melting point B. Dissolution in polar solvents C. Presence of ionic bonds D. Possession of crystal lattice E. Low binding energy |
E |
| 7. |
Which of the following would increase the rate of reaction of chips of a metal M as shown in the equation below? M(s) + 2HCI(aq) → MCI2(aq) + H2(g) A. Diluting the hydrochloric acid B. Adding some distilled water C. Decreasing the temperature D. Grinding the metal into powder E. Increasing the pressure |
D |
| 8. |
The oxidation number of phosphorus in PO 3/4 is A. + 1 B. +2 C. +3 D. +4 E. +5 |
E |
| 9. |
The number of atoms in 1.2g of carbon - 12 isotope is A. 1.00 x 10 22 B. 6.02 x 1022 C. 1.20 x 10 23 D. 1.00 x 1023 E. 6.02 x 1024 |
B |
| 10. |
Tetraoxosulphate (lV) acid is described as strong acid because it is highly A. corrosive B. concentrated C. reactive D. soluble in water E. ionized in water |
E |