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
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
Aqueous sodium trioxocarbonate (IV) solution is alkaline because
- A. acid from which it is formed is strong
- B. sodium is an alkali metal
- C. sodium trioxocarbonate (IV) is decomposed by water
- D. sodium trioxocarbonate (lV) is stable to heat
- E. sodium triocarbonate (IV) is hydrolysed in water
Which of the following equations represents the reaction of chlorine with hot concentrated sodium hydroxide solution?
- A. 2NaOH+CI2 → NaCIO + NaCI + H2O
- B. 4NaOH + 2CI → 4NaCI + 2H2O + O2
- C. 6NaOH + 3CI2 → NaCIO3 + 5NaCI + 3H2O
- D. 2NaOH + CI2 → 2NaCI + H2O2
- E. NaOH + 2CI2 + H2O → NaCI + 3HCI + O2
Which of the following is not a naturally occurring iron ore?
- A. FeCl2
- B. Fe2O3O3
- C. Fe2O3
- D. FeCO3
- E. FeS2
Which of the following metals cannot extracted from its ore by using carbon (ll) oxide as the reducing agent?
- A. Cu
- B. Zn
- C. Al
- D. Pb
- E. Fe
Water gas is a mixture of?
- A. CO2 and H2
- B. CO and H2O
- C. CO2 and CO
- D. CO and N2
- E. CO and H2
How many isomers can be obtained from C4H10?
- A. o
- B. 1
- C. 2
- D. 3
- E. 4
What volume of oxygen will be left unreacted when a mixture of 100cm3 of hydrogen and 200cm,sup>3,/sup> of oxygen are exploded in a eudiometer?
- A. 300cm3
- B. 200cm3
- C. 150cm3
- D. 100cm3
- E. 50cm3
Which of the following is not true of the rusting of iron?
- A. Rusting is a reduction process
- B. Rusting of iron takes place in the presence of oxygen and moisture
- C. the rust formed is reddish brown
- D. the major constituent of rust is hydrated iron (lll) oxide
- E. rusting is similar to burning
Which of the following is not true of the rusting of iron?
- A. Rusting is a reduction process
- B. Rusting of iron takes place in the presence of oxygen and moisture
- C. the rust formed is reddish brown
- D. the major constituent of rust is hydrated iron (lll) oxide
- E. rusting is similar to burning
Which of the following is not decomposed by heat?
- A. CaCO3
- B. CuCO3
- C. ZnCO,sub>3
- D. Na2CO3
- E. MgCO3