The following equations represent redox reactions EXCEPT
- A. Ba2+(aq) + SO2-4 (aq) → BaSO4(s)
- B. Cl2(g) + 2Br- (aq) → 2CI - (aq) + Br2(g)
- C. Fe2+(aq) + ½ C I2(aq) → Fe3+ (aq) + CI-(aq)
- D. 2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) Sn4+ (aq)
- E. Zn(s) + CU2+(aq) → Zn2+(aq) + CU(s)
What volume of carbon (IV) oxide in dm 3 is produced at s.t.p. when 2.50g of CaCO3 reacts with excess acid according to the following equation? CaCO3(s) + 2HCI(aq) → CaCl2(aq) + H2O(1) + CO2(g)
[CaCO2 100; molar volume of a gas at s.t.p. = 22.4dm 3]
- A. 0.28
- B. 0.56
- C. 2.24
- D. 5.6
- E. 11.2
Brain tumors can be located by using an isotope of
- A. carbon - 14
- B. iodine 131
- C. technetium 99
- D. uranium235
- E. uranium 238
During the extraction of iron in the blast furnance, slag is produced using
- A. carbon
- B. crylite
- C. limestone
- D. oxygen
- E. sulphur
X = – log10 H+]
What does X stand for in the expression above?
- A. Degree of acidity
- B. Enthalpy change
- C. Equilibrium constant
- D. Ionic product of water
- E. Solubility product
Which of the following gases is absorbed from the air due to photosynthesis?
- A. Carbon (II) oxide
- B. Carbon (IV) oxide
- C. Nitrogen
- D. Noble gases
- E. Oxygen
How many atoms of chlorine are required to saturate the double bonds of a compound containing a triene?
- A. 2
- B. 3
- C. 4
- D. 5
- E. 6
All the following belong to the same family EXCEPT
- A. glycerol
- B. nylon
- C. perspex polyethene
- D. polyethene
- E. polystyrene
Ptotal = P1 + P2 + P3 +…………. Pn, is an expression of law
- A. Boyle’s
- B. Charles’
- C. Dalton’s
- D. Graham’s
- E. Gay Lussac’s
The following are ores of metals EXCEPT
- A. bauxite
- B. dolomite
- C. graphite
- D. haematite
- E. magnetite
The green house effect is a climatic condition associated with the presence of excess
- A. carbon (II) oxide
- B. carbon (IV) oxide
- C. hydrogen sulphide
- D. nitrogen (II) oxide
- E. oxygen
Which of the following is a solid at room temperature?
- A. Argon
- B. Bromine
- C. Chlorine
- D. Fluorine
- E. Iodine
The relationship between equilibrium constant and free energy change is represented as
- A. δ G ° =-nFE °
- B. δG °-RT ln K
- C. δ G °= + RT In k
- D. δG ° = δH – T S
- E. H=TδS
Which of the following salt solutions will have a pH greater than 7?
- A. NaCl
- B. NaHSO4
- C. Na2CO4
- D. Na2SO4
- E. MgCl2
Non-polar molecules are held together by
- A. co-ordinate bond
- B. covalent bond
- C. electromagnetic force
- D. hydrogen bond
- E. Van der Waals forces
The Ideal Gas Law is expressed mathematically as
- A. P1 /T1 = P2/T2
- B. P1/V1 = P2V2
- C. PV =nRT
- D. PV =KT
- E. V1/T1 = V2/T2
Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding
- A. covalent
- B. dative
- C. electrovalent
- D. hydrogen
- E. metallic
The furring of kettles and boilers are caused by
- A. calcium hydroxide
- B. calcium hydrogen trioxocarbonate (IV)
- C. calcium trioxocarbonate (IV)
- D. calcium tetraoxocarbonate
- E. magnesium tetraoxocarbonate (VI)
Which of the following metals is NOT extracted by electrolysis?
- A. Aluminium
- B. Calcium
- C. iron
- D. Magnesium
- E. Sodium
What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]
- A. 0.32
- B. 0.64
- C. 3.18
- D. 6.35
- E. 9.65
How many zones are present in a luminous Bunsen burner flame?
- A. 2
- B. 3
- C. 4
- D. 5
- E. 6