Year :
2002
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
31 - 40 of 52 Questions
| # | Question | Ans |
|---|---|---|
| 31. |
What will happen if more heat is applied to the following system at equilibrium? X2(g) + 3Y 2(g) ⇌ 2XY3(g); ∆H = xKJmol-1 A. the yield of XY 3 will decompose B. more of XY3 will decompose C. More of X2 will react D. the forward reaction will go to completion |
C |
| 32. |
What is the expression for the equilibrium constant (Kc) for the following reaction? N2(g) + O2(g) ⇌ 2NO(g) A. \(\frac{[NO^2]}{[N^2] + [O^2]}\) B. \(\frac{[2NO]^2}{[N_2][O_2]}\) C. \(\frac{[N_2] + [O_2]}{2[NO]^2}\) D. \(\frac{[NO]^2}{[N_2][O^2]}\) |
D |
| 33. |
Equal amounts of marble chips are reacted separately with 100cm3 of hydrochloric acid of different concentrations. If all the marble chips reacted; which of the following remained the same in each case? A. Average rate of evoluton of gas B. Total mass of gas evolved during the reaction C. Time taken for the reaction to reach completion D. Initial reaction rates |
B |
| 34. |
CuSO45H2O can be obtained from an aqueous solution of copper (ll) tetraoxosulphate (VI) by A. evaporation to dryness B. using chromatography C. precipitation D. crystallization |
D |
| 35. |
Which of the following compounds will leave a metal residue when heated? A. Cu(NO3)2 B. AgNO3 C. K2CO3 D. CaCO3 |
B |
| 36. |
A visible change is observed when a strip of iron is placed in an aqueous solution of A. FeSO4 B. ZnSO4 C. CuSO4 D. MgSO4 |
C |
| 37. |
Consider the following equation: Cr2O2-7(aq) + 14H+(aq) + 6e- → 2Cr3+(ag) + 7H2O(1). The oxidation number of chromium changes from A. -2 to + 3 B. -2 to + 6 C. +6 to +3 D. +7 to + 6 |
C |
| 38. |
Which of the following ions require the largest quantity of electricity for discharge at an electrode? A. 2.0 mole of Q 3+ B. 2.5 mole of R2+ C. 3.0 mole of T- D. 4.0 mole of Y- |
A |
| 39. |
If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is the one that has the A. smaller mass B. lower electrical charge C. greater stability in solution D. stronger tendency to accept electrons |
D |
| 40. |
When concentrated sodium chloride solution is electrolysed using inert electrodes, the products are A. oxygen and hydrogen B. hydrogen and chlorine C. sodium and oxygen D. sodium and chlorine |
B |
| 31. |
What will happen if more heat is applied to the following system at equilibrium? X2(g) + 3Y 2(g) ⇌ 2XY3(g); ∆H = xKJmol-1 A. the yield of XY 3 will decompose B. more of XY3 will decompose C. More of X2 will react D. the forward reaction will go to completion |
C |
| 32. |
What is the expression for the equilibrium constant (Kc) for the following reaction? N2(g) + O2(g) ⇌ 2NO(g) A. \(\frac{[NO^2]}{[N^2] + [O^2]}\) B. \(\frac{[2NO]^2}{[N_2][O_2]}\) C. \(\frac{[N_2] + [O_2]}{2[NO]^2}\) D. \(\frac{[NO]^2}{[N_2][O^2]}\) |
D |
| 33. |
Equal amounts of marble chips are reacted separately with 100cm3 of hydrochloric acid of different concentrations. If all the marble chips reacted; which of the following remained the same in each case? A. Average rate of evoluton of gas B. Total mass of gas evolved during the reaction C. Time taken for the reaction to reach completion D. Initial reaction rates |
B |
| 34. |
CuSO45H2O can be obtained from an aqueous solution of copper (ll) tetraoxosulphate (VI) by A. evaporation to dryness B. using chromatography C. precipitation D. crystallization |
D |
| 35. |
Which of the following compounds will leave a metal residue when heated? A. Cu(NO3)2 B. AgNO3 C. K2CO3 D. CaCO3 |
B |
| 36. |
A visible change is observed when a strip of iron is placed in an aqueous solution of A. FeSO4 B. ZnSO4 C. CuSO4 D. MgSO4 |
C |
| 37. |
Consider the following equation: Cr2O2-7(aq) + 14H+(aq) + 6e- → 2Cr3+(ag) + 7H2O(1). The oxidation number of chromium changes from A. -2 to + 3 B. -2 to + 6 C. +6 to +3 D. +7 to + 6 |
C |
| 38. |
Which of the following ions require the largest quantity of electricity for discharge at an electrode? A. 2.0 mole of Q 3+ B. 2.5 mole of R2+ C. 3.0 mole of T- D. 4.0 mole of Y- |
A |
| 39. |
If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is the one that has the A. smaller mass B. lower electrical charge C. greater stability in solution D. stronger tendency to accept electrons |
D |
| 40. |
When concentrated sodium chloride solution is electrolysed using inert electrodes, the products are A. oxygen and hydrogen B. hydrogen and chlorine C. sodium and oxygen D. sodium and chlorine |
B |