Year :
1988
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
31 - 36 of 36 Questions
| # | Question | Ans |
|---|---|---|
| 31. |
Which of the following correctly explains why iodine crystals change directly into the gaseous state when heated? A. lodine crystals sublime B. lodine atoms are held together by strong forces C. lodine molecules are held together by weak forces D. lodine molecules are covalent E. lodine is a solid at room temperature |
C |
| 32. |
Which of the following is a waste product in the Solvary Process for the manufacture of sodium trioxocarbonate (IV)? A. Ammonium chloride B. Brine C. Limestone D. Calcium oxide E. Calcium chloride |
E |
| 33. |
When copper (ll) chloride solution is treated with excess aqueous ammonia, a deep blue solution results This is due to the presence of A. (CuNH4)3+ ions B. (CuCI4)2-ions C. [Cu(OH)4]2- ions D. Cu(H2-O)42+ IONS E. [cU(NH3)4] ions |
E |
| 34. |
The complex salt formed when aluminium dissolves in sodium hydroxide solution is A. Na3AI(OH)4 B. Na2AI(OH)3 C. NaAI(OH)3 D. Na4AI(OH)4 E. NaAI(OH)4 |
E |
| 35. |
The reaction represented by the equation C(s) + H2O(l) → CO(s) + H 2(s) was carried out at 27oC if the enthalpy change was + 4500 J and the entropy change was + 12J, what was the free energy change? (∆G = ∆H - T∆S) A. - 4176 J B. +4176 J C. - 900 J D. + 900 J E. +8100 J |
D |
| 36. |
During the electrolysis of dilute tetraoxosulphate (VI) acid solution 0.05 mole of electrons were passed what volume of gas was produced at the anode? (Gaseous molar volume = 22. 4dm3 at s.t.p) A. 0.224 dm3 B. 0.280 dm3 C. 0.560 dm3 D. 2.24 dm3 E. 22.4 dm3 |
B |
| 31. |
Which of the following correctly explains why iodine crystals change directly into the gaseous state when heated? A. lodine crystals sublime B. lodine atoms are held together by strong forces C. lodine molecules are held together by weak forces D. lodine molecules are covalent E. lodine is a solid at room temperature |
C |
| 32. |
Which of the following is a waste product in the Solvary Process for the manufacture of sodium trioxocarbonate (IV)? A. Ammonium chloride B. Brine C. Limestone D. Calcium oxide E. Calcium chloride |
E |
| 33. |
When copper (ll) chloride solution is treated with excess aqueous ammonia, a deep blue solution results This is due to the presence of A. (CuNH4)3+ ions B. (CuCI4)2-ions C. [Cu(OH)4]2- ions D. Cu(H2-O)42+ IONS E. [cU(NH3)4] ions |
E |
| 34. |
The complex salt formed when aluminium dissolves in sodium hydroxide solution is A. Na3AI(OH)4 B. Na2AI(OH)3 C. NaAI(OH)3 D. Na4AI(OH)4 E. NaAI(OH)4 |
E |
| 35. |
The reaction represented by the equation C(s) + H2O(l) → CO(s) + H 2(s) was carried out at 27oC if the enthalpy change was + 4500 J and the entropy change was + 12J, what was the free energy change? (∆G = ∆H - T∆S) A. - 4176 J B. +4176 J C. - 900 J D. + 900 J E. +8100 J |
D |
| 36. |
During the electrolysis of dilute tetraoxosulphate (VI) acid solution 0.05 mole of electrons were passed what volume of gas was produced at the anode? (Gaseous molar volume = 22. 4dm3 at s.t.p) A. 0.224 dm3 B. 0.280 dm3 C. 0.560 dm3 D. 2.24 dm3 E. 22.4 dm3 |
B |