The four classes of hydrocarbons are?
- A. ethane, ethene, ethyne and benzene
- B. alkanes, alkenes, alkynes and aromatics
- C. alkanes, alkenes, alkynes and benzene
- D. methane, ethane , propane and butane
Alkanoates are formed by the reaction of alkanoic acid with?
- A. Alkyl halides
- B. alkanols
- C. ethers
- D. sodium
Methylethanoate reacts with ammonia to yield?
- A. mettylamine and ethanol
- B. ethylamine and methanol
- C. methanamide and ethanol
- D. ethanamide and methanol
Crude copper can be purified by the electrolysis of CuSO4(aq) if?
- A. platinum electrodes are used
- B. the crude copper is made the anode of the cell
- C. the crude copper is made the cathode of the cell
- D. crude copper electrodes are used
Given the reactions (i) Fe(s) + X(NO3)2(aq) → Fe(NO3) + X(s) (ii) H2(g) + XO
- A. copper
- B. zinc
- C. calcium
- D. lead
Aluminium is extracted commercially from its ore by?
- A. heating aluminium oxide with coke in a furance
- B. the electrolysis of fused aluminium oxide in cryolite
- C. treating cryolite with sodium hydroxide solution under prressure
- D. heating sodium aluminium silicate to a high temperature
Chlorine is produced commmercially by?
- A. electrolysis of dilute hydrochloric acid
- B. electrolysis of brine
- C. neutralization of hydrogen chloride
- D. heating potassium trioxochlorate (V)
The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?
- A. nitrogen (ll) oxide
- B. nitrogen (l) oxide
- C. nitrogen (lV) oxide
- D. nitrogen
Suitable reagents for the laboratory preparation nitrogen are?
- A. sodium dioxonitrate (III) and ammonium chloride
- B. sodium dioxonitrate (V) and ammonium chloride
- C. sodium chloride and ammonium chloride
- D. sodium chloride and ammonium diozonitrate (III)
When H2S gas is passed into a solution of iron (III) chloride, the colour changes from yellow to green. This is because?
- A. H(s)S is reduced to S
- B. Fe3+ ions are oxidized by H(s)S
- C. Fe3+ ions are oxidized Fe3+ ions
- D. Fe3+ ions are reduced to Fe2+ ions
Which of the following is used in fire extinguishers?
- A. Carbon (ll) oxide
- B. Carbon (lV) oxide
- C. Sulphur (lV) oxide
- D. Ammonia
Which property of a reversible reaction is affected by a catalyst?
- A. Heat content (enthalphy)
- B. Energy of activation
- C. Free energy change
- D. Equilibrium position
Which of the followingstatements is TRUE?
- A. The dissolution of NaOH(s) in water is endothermic
- B. The heat os solution of NaOH(s) is positive
- C. The NaOH(s) gains heat from the surroundings
- D. The heat of solution of NaOH(s) is negative
Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na2S2O3(aq) + 2HCl(aq) → 2NaCI(aq) + H2O(I) + SO2(g) + S(g)?
- A. A decrease in temperature and an increase in the concentration of the reactants
- B. An increase in the temperature and a decrease in the cocentration of the reactants
- C. An increase in temperature and an increase in the concentration of the reactants
- D. A decrease in the temperature and a decrease in the concentration of the reactants
A mixture of starch solution and potassium iodide was placed in a test tube. On adding dilute tetraoxosulphate (lV) acid and then K2Cr2O7 solutions, a blue-black colour was produced. In this reaction, the?
- A. iodide is oxidized
- B. tetraoxosulphate (Vl) acid acts as an oxidizing agent
- C. starch has been oxidized
- D. K2Cr2O7 is oxidized
Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?
- A. Cu2+ + 2e- → Cu(s)
- B. 2Cl- -2e → Cl2
- C. Cu(s) -2e → Cu2+(aq)
- D. Cu2+(aq) + 2Cl-(aq) → CuCl2(aq)
Which of the following acts both s a reducing and an oxidizing agent?
- A. H2
- B. SO2
- C. H2S
- D. C
Which of the following substances is a basic salt?
- A. Na2CO3
- B. Mg(OH)CI
- C. NaHCO3
- D. KSO4.AI2(SO4)3,24H2O
What volume of a 0.1 M H3PO4 will be required to neutralize 45.0 cm3 of a 0.2 M NaOH?
- A. 10.0 cm3
- B. 20.0 cm3
- C. 27.0 cm3
- D. 30.0 cm3
Which of the following in aqueous solution is neutral to litmus?
- A. NH4CI
- B. NaCO3
- C. FeCl3
- D. NaCl
Which of the following dilute solutions has the lowest pH value?
- A. Calcium trioxocarbonate (IV)
- B. Sodium trioxocarbonate (IV)
- C. Hydrochloric acid
- D. Ethanoic acid