Hydrochloric acid is regarded as a strong acid because it
- A. ionizes partially
- B. ionizes completely
- C. is a mineral acid
- D. reacts with a base
When a specie undergoes oxidation, its
- A. oxidation number increases
- B. oxidation number decreases
- C. oxidation number remains constant
- D. acts as oxidizing agent
An example of a substance that does not change directly from solid to gas when heated is
- A. NH\(_4\)Cl\((_s\))
- B. I\(_2\)\((_s\))
- C. CaCO\(_3\) \((_s\))
- D. S\(_8\) \((_s\))
\(^{14}_7\)N + X → \(^{14}_6\)C + \(^1_1\)P
In the reaction above, X is
- A. a proton
- B. an alpha particle
- C. a beta particle
- D. a neutron
The substance that reacts with sodium to form alkali and changes white anhydrous copper(II) tetraoxosulphate (VI) to blue is
- A. base
- B. acid
- C. water
- D. solvent
A major effect of oil pollution in coastal water is
- A. destruction of aquatic life
- B. nitrification of the water body
- C. detoxification of water
- D. disinfection of the water body
The combustion of candle under limited supply of air forms
- A. water and CO\(_2\)
- B. water and CO
- C. soot and CO
- D. soot and CO\(_2\)
In the treatment of water for municipal supply, chlorine is used to
- A. prevent tooth decay
- B. prevent goitre
- C. kill germs
- D. remove colour or odour
The scientist that performed the experiment on discharged tubes that led to the discovery of the cathode rays as a sub-atomic particle is
- A. J.J Thomson
- B. Robert Millikan
- C. Ernest Rutherford
- D. Niels Bohr
Determine the empirical formula of an oxide of sulphur containing 60% of oxygen
[S = 32, O = 16 ]
- A. SO\(_3\)
- B. SO\(_2\)
- C. SO\(_4\)
- D. SO
Fog is a colloid in which
- A. liquid particles is dispersed in a gas medium
- B. gas particles dispersed in a liquid medium
- C. solid particles dispersed in a gas medium
- D. gas particles dispersed in a solid medium
The volume in cm\(^3\) of a 0.12 moldm\(^{-3}\) HCl required to completely neutralize a 20cm\(^3\) of 0.20 moldm\(^{-3}\) of NaOH is
- A. 12.00
- B. 0.0012
- C. 33.33
- D. 2.40
Which of the following is an air pollutant?
- A. O\(_2\)
- B. CO
- C. H\(_2\)O\((_g\))
- D. O\(_3\)
Calculate the mass of Magnesium that will be liberated from its salt by the same quantity of electricity that liberated 16.0 g of Silver.
[Mg = 24.0, Ag = 108 ]
- A. 3.65 g
- B. 3.56 g
- C. 1.87 g
- D. 1.78 g
\(^{238}_{92}\)U + \(^1_0\)n → \(^{239}_{92}\)U
The process above produces
- A. atomic mutation
- B. a radioactive isotope
- C. other neutrons
- D. radiations
The shape of the molecule of Carbon(IV) oxide is
- A. tetrahedral
- B. pyramidal
- C. plannar
- D. linear
The salt formed when strong acid reacts with strong base is
- A. normal
- B. double
- C. complex
- D. basic
When n = 3, the quantum number of an element is
- A. 3
- B. 9
- C. 18
- D. 21
A gas that turns lime water milky is likely to be from
- A. Trioxocarbonate(IV)
- B. Chloride
- C. Trioxonitrate(V)
- D. Tetraoxosulphate(VI)
Rust on the surface of a metal sheet contains
- A. hydrated iron(II)oxide
- B. hydrated iron(III)oxide
- C. iron(III)hydroxide
- D. iron(III) trioxocarbonate(IV)
The element which can combine with oxygen to form an acid anhydride of the form XO\(_2\) is
- A. phosphorus
- B. Chlorine
- C. fluorine
- D. sulphur