The compound that makes palm wine taste sour after exposure to the air for few days is
- A. ethanol
- B. ethanoic acid
- C. methanol
- D. methanoic acid
When bromine is added to ethene at room temperature, the compound formed is
- A. 1,1 - dibromoethane
- B. 1,2 - dibromoethene
- C. 1,1 - dibromoethene
- D. 1,2 - dibromoethane
The following substances are examples of addition polymer except
- A. nylon
- B. perspex
- C. polyethene
- D. polychloroethene
Which of the following separation techniques would show that black ink is a mixture of chemical compounds?
- A. Crystallization
- B. Chromatography
- C. Filtration
- D. Sublimation
Which of the following compounds would react with ethanoic acid to give a sweet smelling liquid?
- A. Alkane
- B. Alkanol
- C. Alkanal
- D. Alkyne
Which of the following compounds determines the octane rating of petrol?
- A. 1,2,3 - trimethlpentane
- B. 2,3,5 - trimethyloctane
- C. 2,3,5 - trimethylpentane
- D. 2,2,4 - trimethylpentane
Consider the following electrochemical cell notation: M(s) / M2+ (aq)// H+ (aq)/ H2(g). The value of the electrode potential is positive when?
- A. electrons flow from the metal electrode, M(s) to hydrogen electrode, H2(g)
- B. electrons fow from hydrogen electrode, H2(g) to metal electrode, M(s)
- C. the flow of current is high
- D. there is equilibrium between the flow of electrons from the hydrogen electrode, H2(g) to metal electrode, M(s)
Which of the following metals could be used as sacrifical anode for preventing the corrosion of iron?
- A. Copper
- B. Lead
- C. Magnesium
- D. Silver
What mass of copper would be formed when a current of 10.0 A is passed through a solution of CuSO4 for 1 hour? [Cu = 63.5; 1F = 96500C]
- A. 5.9 g
- B. 11.8 g
- C. 23.8 g
- D. 47.3 g
What is the value of n in the following equation? Cr2O72- + 14H+ + ne– → 2Cr 3+ + 7H2O
- A. 2
- B. 3
- C. 6
- D. 7
Consider the following reaction equation:
X(g) + Y(g) ⇌ XY(g); ∆H = + 220KJ mol-1 If the temperature of the system is increased, the
- A. backward reaction would be favoured
- B. forward reaction would favoured
- C. reaction would stop
- D. reaction would be at equilibrium
On evaporation to dryness, 250 cm3 of saturated solution of salt X with relative molar mass 101 gave 50.5g of the. What is the soluility of the salt?
- A. 1.0 mol dm-3
- B. 2.0 mol dm-3
- C. 4.0 moldm-3
- D. 5.0 moldm-3
Which of the following metallic oxides is amphoteric?
- A. AI2O3
- B. Fe2O3
- C. MgO
- D. Na2O
When NH 4CI was dissolved in water, the container was cold to touch. This implies that
- A. the process is endothermic
- B. the process is exothermic
- C. NH4CI is highly soluble in water
- D. NH 4CI forms a saturated solution
Which of the following statements about enthalpy of neutralization is correct? It
- A. is constant for a strong acid and a strong base
- B. cannot be determined using calorimeter
- C. has a positive value
- D. is higher for strong acid and a weak base
The colour of phenolphthalein indicator in alkaline solution at the end-point of an acid-base titration is?
- A. colourless
- B. orange
- C. pink
- D. yellow
Which of the following equimolar solutions has the highest conductivity?
- A. CH3COOH(aq)
- B. H2CO3(aq)
- C. H 2SO 4(aq)
- D. NaOH (aq)
The initial volume of a gas at 300 K was 220 cm 3 Determine its temperature if the volume became 250 cm 3
- A. 183 K
- B. 264 K
- C. 300 K
- D. 341 K
The equation P = \(\frac{K}{V}\) illustrates
- A. Boyle's law
- B. Charles' law
- C. Dalton's law
- D. Gay Lussac's law
Bubbling excess carbon (IV) oxide into calcium hydroxide solution results in the formaton of
- A. CaO
- B. Ca(HCO3)2
- C. H2CO3
- D. CaCO3
A gas that is collected by upward delivery is likely to be
- A. heavier than air
- B. insoluble in water
- C. lighter than air
- D. soluble in water