Stpm Inorganic Chemistry: Aluminium
Aluminum is the world's lightest metal and for this property it is used in the manufacture of airplanes and other things. This quiz focuses on inorganic Chemistry and Aluminum to be precise. All the best.
- 1.
Which of the following properties does not apply to modern ceramics?- A.
High melting point
- B.
Application in engineering
- C.
Corrode readily
- D.
Very hard
- 2.Which of the following statements about aluminium is not true?
- A.
It is extracted by electrolysis.
- B.
Its chloride is covalent.
- C.
It is soluble in concentrated nitric acid
- D.
It is soluble in sodium hydroxide solution
- 3.Which of the following statements is true of dimer Al2Cl6?
- A.
It is an ionic compound.
- B.
Aluminium atom undergoes sp2 hybridisation.
- C.
It is a white solid which melts when heated.
- D.
There are two coordinate covalent bonds in the molecule.
- 4.When sodium sulphide is added to an aqueous solution of aluminium chloride, the gas evolved is
- A.
Cl2
- B.
CO2
- C.
H2S
- D.
HCl
- 5.Why is the aqueous solution of an aluminium salt acidic?
- A.
[Al(H2O)6]3+ ion receives a proton in aqueous solution.
- B.
[Al(H2O)6]3+ ion donates a proton in aqueous solution.
- C.
[Al(H2O)6]3+ ion disproportionate and produces H+ (aq) ions.
- D.
Acidic [Al(H2O)6OH]2+ ions are produced in solution.
- 6.Which statement is not true concerning the aluminium ion, Al3+?
- A.
The Al3+ ion has a high charge density and developes covalent character in its ionic compounds
- B.
In water, the Al3+ ions exist as a complex ion [Al(H2O)6]3+.
- C.
An aqueous solution of Al3+ ions has a pH = 7.
- D.
If hydroxide ions are added to a solution of an aluminium salt, a white precipitate is formed.
- 7.Which equation represents the reaction between aqueous aluminium and potassium hydroxide?
- A.
Al (s) + 4OH- (aq) → [Al(OH)4]- (aq)
- B.
Al (s) + 6OH- (aq) → [Al(OH)6]3- (aq)
- C.
Al (s) + 4H2O (l) → [Al(H2O)4]- (aq)
- D.
Al (s) + 3H2O (l) + OH- (aq) → [Al(OH)4]- (aq) + 3/2 H2 (g)
- 8.A piece of aluminium foil is treated with aqueous mercury(II) chloride to expose a clean surface of the metal. The foil is rinsed and left to stand in water. Bubbles of gas are given off. The final products include
- A.
aluminium oxide and hydrogen
- B.
Aluminium chloride and hydrogen
- C.
Aluminium hydroxide and hydrogen
- D.
Aluminium hydroxide and oxygen
- 9.Aluminium sulphate solution contains aqueous aluminium ions. What is the shape of the Al3+ ions?
- A.
Tetrahedron
- B.
Octahedron
- C.
Square planar
- D.
Trigonal planar
- 10.Which of the following is true?
- A.
Both aluminium fluoride and aluminium chloride are covalent compounds
- B.
Both aluminium fluoride and aluminium chloride are ionic compounds
- C.
Aluminium fluoride is an ionic compound while aluminium chloride is an covalent compound
- D.
Aluminium fluoride is an covalent compound while aluminium chloride is an ionic compound
- 11.The reaction between aluminium foil and hydrochloric acid is slow in the beginning. After a few minutes, the rate increases. The reason is
- A.
One of the products act as a catalyst
- B.
The layer of oxide on the surface aluminium slows down the reaction at the beginning
- C.
The hydrolysis of aluminium ions decreases the rate of reaction
- D.
The chloride ion has a small size and hence difficult to be polarized by the aluminium ion
- 12.Aluminium oxide reacts with acids and with alkalis. Which statement is not true?
- A.
The lattice energy for aluminium oxide is high
- B.
Aluminium oxide has an ionic bond with covalent character
- C.
Aluminium oxide is soluble in water
- D.
Aluminium oxide is an amphoteric oxide
- 13.Which statement cannot be explained by the polarising power of aluminium ions, Al3+?
- A.
A high boiling point of aluminium fluoride.
- B.
Amphoteric nature of aluminium hydroxide
- C.
The aluminium ion can pull the bonded electron pair in the water molecule.
- D.
A solution of [Al(H2O)6]3+ ions is acidic.
- 14.In the extraction of aluminium from bauxite, a current of 40 000 A is used. The function of the high current is to
- A.
Prevent the discharge of Na+ from the dissociation of cryolite
- B.
increase the yield of aluminium
- C.
Keep the temperature of the electrolysis cell at 900 oC
- D.
increase the rate of reaction
- 15.
Zeolite is an aluminium compound with many uses. Which of the following is not one of its uses?
- A.
To separate straight chained hydrocarbons from branched hydrocarbons.
- B.
To bind dyes.
- C.
To synthesis molecules of a specific size
- D.
As a cation exchanger
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