Locally produced soap in which wood ash is used as the base is usually soft because the wood ash contains a lot of
- A. sodium ions
- B. potassium ions
- C. lithium ions
- D. calcium ions
- E. magnesium ions
Copper can best be purified by
- A. roasting the impure copper in a blast furnace
- B. heating the oxide with coke
- C. electrolyzing a copper (ll) salt solution using the impure copper as the anode
- D. converting the impure copper to a trioxonitrate (V)
- E. washing the impure copper with sodium hydroxide solution
Which of the following carbohydrates does NOT usually occur in the crystalline form?
- A. Fructose
- B. Glucose
- C. Sucrose
- D. Maltose
- E. Cellulose
When an element can exist in two or more forms in the same physical state, the element is said to exhibit
- A. isotopy
- B. isomerism
- C. allotropy
- D. hygroscopy
- E. sublimation
Given that for the reaction KOH (aq) + HCI(aq) → KCI(aq) + H2O(L) H = – 54 Kj mol-1. What is the quantity of heat involved in the reaction?2NaOH(aq) + H2SO 4(aq) → Na2SO4(aq) + 2H 2O(l)?
- A. - 108Kj
- B. -54 kj
- C. -27 kj
- D. +27 kj
- E. +54 kj
Which of the following gases will bleach moist litmus paper?
- A. CI2
- B. CO2
- C. SO2
- D. HCI2
- E. N2 O
How many carbon atoms are there in a benzene ring?
- A. 4
- B. 5
- C. 6
- D. 7
- E. 8
If 200cm 3 of a gas at s.t.p. has a mass of 0.268g, what is its molar mass? (Molar volume of a gas at s.t.p. = 22.4 dm3)
- A. 300g
- B. 200g
- C. 150g
- D. 30g
- E. 15g
The following are miscible with water except
- A. ethylethanoate
- B. methanol
- C. ethanoic acid
- D. methanoic acid
- E. ethanol
The most suitable method to use when separating an insoluble solid from a liquid is
- A. evaporation
- B. filtration
- C. magnetization
- D. sublimation
- E. distillation
Which of the following hydrocarbons is not likely to be present in petrol?
- A. C14H30
- B. C10H22
- C. C9H20
- D. C7H16
- E. C5H12
The earthly impurities in iron ore are removed in the blast furnace by the reaction
- A. CO2 + C →2CO
- B. Fe2O3 + 3CO →2Fe + 3CO2
- C. SiO2 + CaO →CaSiO3
- D. CaCO3 → CaO + CO2
- E. C +CO2 → CO2
120cm3 of hydrogen were sparked with 60cm 3 of oxygen at 110oC. What was the volume of stream produced? The equation for the reaction is 2H2(g) + O2(g) → 2H2O(g)
- A. 30cm3
- B. 60cm3
- C. 90cm3
- D. 120cm3
- E. 180cm3
Which of the following statements best explains cracking ? It is a process
- A. in which an alkene adds on itself repeatedly to form long chain polymers
- B. in which large hydrocarbon molecules are broken into smaller units
- C. for measuring theoctane number of petrol
- D. in which carbon chain results in a zigzag arrangement
- E. in which aromatic hydrocarbons are produced
Which of the following reactions represents the laboratory preparation of hydrogen?
- A. C(s) + H 2 O(l) → CO(g) + H2(g)
- B. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
- C. Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
- D. Cu(s) + H2O(l) → CuO(s) + H2(g)
- E. 2AI(s) + 3H2O(l) → Al2O3(s) + 3H2(g)
The major raw material in a plastic industry is
- A. ethanol
- B. sulphur
- C. methylethanoate
- D. ethene
- E. ethane
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
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
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
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
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