Sulphur (IV)oxide is a strong reducing agent in the presence of water due to the formation of
- A. hydroxide ion
- B. sulpgur (Vl)oxide
- C. hydrogen sulhide
- D. trioxosulphate (IV) salt
Which of the gases is employed as an anaesthesia?
- A. N 2O
- B. NO2
- C. NH3
- D. NO
In the laboratory preparation of ammonia, the flask is placed in a slanting position so as to
- A. prevent condensed water from breaking the reaction flask
- B. enable the proper mixing of the reactions in the flask
- C. enhance the speed of the reaction
- D. prevent formation of precipitate
Which of the following compounds is a neutral oxide?
- A. Carbon (IV) oxide
- B. Sulphur (Vl) oixide
- C. Sulphur (IV) oxide
- D. Carbon (ll) oxide
the minimum amount of energy required for a reaction to take place is
- A. lattice energy
- B. ionization energy
- C. activation energy
- D. kinetic energy
In an endothermic reaction, if there is a loss in entropy the reaction will
- A. be indeterminate
- B. be spontaneous
- C. not be spontaneous
- D. be at equilibrium
In an electrochemical cell, polarization is caused by
- A. chlorine
- B. oxygen
- C. tetaoxsulphate (Vl) acid
- D. hydrogen
2H2O (l) + 2F2(g) → 4HF(aq) + O2(g).
In the reaction above, the substance that is being reduced is
- A. O2(g)
- B. H2O(l)
- C. F2(g)
- D. HF(aq)
An insoluble salt can be prepared by
- A. the reaction of trioxocarbonate (V) with an acid
- B. double decomposition
- C. the action of dilute acid on an insoluble base
- D. the reaction of metals with an acid
Which of the following substances is not a salt?
- A. Aluminium oxide
- B. Sodium hydrogentrioxosulphate (V)
- C. Sodium trioxocarbonate (V)
- D. Zinc chloride
Three drops of a 1.0 mol dm-3 solution of HCl was added to 20 cm3 of a solution of pH6.4. The pH of the resulting solution will be
- A. close to that of pure water
- B. less than 6.4
- C. greater than 6.4
- D. unaltered
10.0 dm3 of water was added to 2.0 mol dm-3 of 2.5dm3 solution of HCl. What is the concentration of the final solution in mol dm-3?
- A. 0.4
- B. 8.0
- C. 2.0
- D. 0.5
In a water body, too much sewage leads to
- A. a decrease in the temperature of the water which cause in death of aquatic animals
- B. an increase in the number of aquatic animals in the water
- C. an increase in the bacterial population which reduces the level of oxygen in the water
- D. a decrease in the bacterial population which increases the level of oxygen in the water
The solvent used for removing grease stain is
- A. turpentine
- B. ammonia solution
- C. ethanol
- D. solution of borax in water
An example of a hygroscopic substance is
- A. CuO (S).
- B. MgCL2(S).
- C. CaCL2(S).
- D. NaOH(S).
Steam changes the colour of anhydrous cobalt (ll) chloride from
- A. white to red
- B. blue to white
- C. blue to pink
- D. white to blue
The constituent of air that acts as a diluent is
- A. nitrogen
- B. carbon (IV) oxide
- C. noble gases
- D. oxygen
The bond formed between two elements with electron configurations 1s2 2s2 2p6 3s2 and 1s2 2s2 2p4 is
- A. metallic
- B. covalent
- C. dative
- D. ionic
Which of the following molecules is held together by hydrogen bond?
- A. CH4
- B. HBr
- C. H2SO4
- D. HF
The shape of the carbon (lV) oxide molecule is
- A. pyramidal
- B. linear
- C. angular
- D. tetrahedral
The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
- A. carbon-14
- B. phosphorus-32
- C. cobalt-60
- D. iodine-131