Which of the following is an ore of aluminium?
- A. Haematite
- B. Magnetite
- C. Siderite
- D. Bauxite
- E. Cassiterite
Which of the following metals is not extracted by electrolysis ?
- A. lron
- B. Sodium
- C. Calcium
- D. Magnesium
- E. Aluminium
The following oxides react with both acids and bases to form salts except
- A. zinc oxide
- B. lead (ll) oxide
- C. aluminium oxide
- D. tin (IV) oxide
- E. carbon (Iv) oxide
Which of the following is used as water softener?
- A. Na2CO3.10H2O
- B. CuSO4. 5H2O
- C. MgSO4. 7H2O
- D. CaCI2.2H2O
- E. Na2SO4. 10H2O
Which of the following when heated strongly in air will leave a metal as residue?
- A. Sodium trioxonitrate (V)
- B. Potassium trioxonitrate (V)
- C. Silver trioxonitrate (V)
- D. Lead (ll) trrioxonitrate(V)
- E. Aluminium trioxonitrate (V)
When chlorine is added to slaked lime, the product obtained is
- A. bleaching powder
- B. chlorinated water
- C. hydrochloric acid
- D. oxochlorate (l) acid
- E. trioxochlorate (V) salt
Which of the substance lettered P to V in the equation below would be left on the filter paper if the reaction mixture were filtered? P (aq) + Q(aq) → V(s) + R(aq) + T(g)
- A. P
- B. Q
- C. V
- D. T
- E. R
The use of diamond in abrasives is due ti its
- A. high melting point
- B. durability
- C. lustre
- D. hardness
- E. octahedral shape
Which of the following is used widely in the manufacture of flavours and perfumes?
- A. Alkanoates
- B. Alkanones
- C. Alkanes
- D. Complex sugars
- E. Aliphatic compounds
Alkanes react with the halogens mainly by
- A. oxidation
- B. polymerization
- C. addition
- D. reduction
- E. substitution
The by-product of the fermentation of sugar to ethanol is
- A. propane -1,2,3-triol
- B. ethyl ethanoate
- C. ethanedioc acid
- D. propanol
- E. carbon (lV) oxide
Which of the following is the relative molecular mass of a compound which has empirical formula CH\(_2\)O? (H = 1; C = 12; O = 16)
- A. 42
- B. 45
- C. 126
- D. 180
- E. 145
The reaction between alkanoic acids and alkanols in the presence of a mineral acid is known as
- A. saponification
- B. hydrolysis
- C. polymerization
- D. esterification
- E. dehydration
Ethene undergoes mainly addition reactions because it is
- A. a gas
- B. a hydrocarbon
- C. unsaturated
- D. easily polymerized
- E. a covalent compound
Separation of mixture of solids by physical methods can be based on differences in the following except
- A. melting point
- B. solubility
- C. particle size
- D. molar mass
- E. magnetic property
The position of equilibrium in a reversible reaction is affected by
- A. particle size of the reactants
- B. change in concentration of the reactants
- C. change in size of the reaction vessel
- D. vigorous stirring of the reaction mixture
- E. presence of a catalyst
How much heat will be liberated if 8g of hydrogen burns in excess oxygen according to the following equation? 2H2 + O2→ 2H2O,∆H = -571.7KJ (H = 1)
- A. 1.42.9KJ
- B. 571.7KJ
- C. 1143.4KJ
- D. 285.9KJ
- E. 2286.8KJ
If the value of ∆H for a reaction is negative, it means that the reaction is
- A. slow
- B. exothermic
- C. spontaneous
- D. irreversible
- E. not feasible
What is the value of x in the following equation? MnO- 4 + 4H+ + xe- → MnO 2 + 2H2O
- A. 2
- B. 3
- C. 4
- D. 7
- E. 8
From the following equations, what is the order of decreasing reactivity of X, Y and Z? Y (s) + X2+(aq) → Y2+(aq) + X(s) X(s) + Z2+(aq) → X2+(aq) + Z(s)
- A. X>Y>Z
- B. Y > X > Z
- C. Z > Y > X
- D. Y > Z > X
- E. X > Z > Y
The common feature of reactions at the anode is that
- A. electrons are consumed
- B. oxidation is involved
- C. ions are reduced
- D. the electrode dissolves
- E. the electrolyte is diluted