Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction
II. it is effective in a reaction but cannot initiate a reaction
III, it affects the equilibrium of a reversible reaction
IV. it affects the overall reaction
- A. I and II only
- B. I, II and III only
- C. II and III only
- D. II, II and IV only
- E. III and IV only
The high boiling point of hydrogen fluoride can be explained in terms of
- A. covalent bonds.
- B. dative bonds.
- C. dipole-dipole bonds.
- D. electrovalent (ionic) bonds
- E. hydrogen bonds.
The oxidation number of X in \(XO_{4}^{3-}\) is
- A. 1
- B. -2
- C. 3
- D. 4
- E. 5
How much sodium hydroxide is required to make 250 cm3 of 0.1 molar solution? Na=23; 0=16; H=1]
- A. 10.0 g
- B. 4.0g
- C. 2.0 g
- D. 1 .0g
- E. 0.1 g
What is the ratio of the rate of diffusion of carbon(IV) oxide to that of propane, under the same conditions? [H = 1; C= 12; 0= 161
- A. 1:01
- B. 1:01
- C. 2:01
- D. 2:03
- E. 3:01
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is
- A. 3
- B. 9
- C. 10
- D. 18
- E. 32
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
- A. black
- B. blue
- C. green
- D. white
- E. yellow
Which compound is a product of the hydrolysis of the of CH3COOC3H7 with aqueous sodium hydroxide?
- A. CH3COOH
- B. CH3COONaCCH3OH
- C. CH3OH
- D. C2H5OH
- E. C3H7COONa
The alloy used for welding and plumbing contains
- A. aluminum and copper.
- B. copper and tin
- C. iron and aluminum.
- D. lead and antimony.
- E. lead and tin.
in any chemical reaction, the total mass of products is always equal to that of the reactants.
This Is statement of the law of:
- A. conservation of matter.
- B. Constant composition
- C. definite proportions.
- D. multiple proportions.
- E. reciprocal proportions.
Which metal will dissolve in aqueous sodium hydroxide?
- A. aluminium
- B. copper
- C. iron
- D. sikeer
- E. tin
Which compound can be used as a reducing agent in a reaction?
- A. Cl2
- B. KMnO4
- C. KCr2O7
- D. MnO2
- E. Na2SO3
what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)
- A. Artificial radioactivity
- B. nuclear fission
- C. nuclear fusion
- D. radio-decomposition
- E. spontaneous disintegration
The position of an element in the Periodic Table is determined by?
- A. its atomic radius.
- B. its density.
- C. its relative atomic mass.
- D. the number of protons in its atom.
- E. the number of neutrons in its atoms
Which element contains the greatest number of moles?
- A. 8 g of Helium
- B. 48 g of Carbon
- C. 78 g of Potassium
- D. 130g of Zinc
- E. 216g of Sliver
The use of sulphur to vulcanize rubber is made to make it
- A. blacker.
- B. cheaper. .
- C. more elastic
- D. tougher
- E. softer.
The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is
- A. 1
- B. 2
- C. 3
- D. 4
- E. 5
Animal charcoal differs from wood charcoal in that it
- A. has a dark colour
- B. has a high carbon content
- C. is a good absorbent
- D. is crystalline.
- E. is rich in phosphate content
Which statement BEST describes the process of oxidation?
- A. addition of hydrogen
- B. loss of oxygen
- C. decrease in oxidation number
- D. loss of electrons
- E. gain of elections.
The decreasing order of the oxidising power of the halogens is
- A. Br>I>Cl>F
- B. F>I>Cl>Br
- C. F>Cl>Br>l
- D. I>Br>Cl>F
- E. Cl>Br>F>I
20 cm3 of 0.09 mol dm3 solution of tetraoxosuiphate (Vi) acid requires 30cm3 of sodium hydroxide solution for complete neutralization. The molar concentration of sodium hydroxide is [H = 1; S = 32; 0 = 16; Na = 23]
- A. 0.03 mol dm3
- B. 0.12 mol dm3
- C. 0.27 mol dm3
- D. 0.45 mol dm3
- E. 0.90 mol dm3