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
Correct Answer
C. Corrode readilyExplanation
Modern ceramics are known for their high melting point, application in engineering, and being very hard. However, they do not corrode readily. This is because ceramics are typically made from inorganic materials that are resistant to chemical reactions and corrosion. They are stable and durable, making them suitable for various applications in industries such as aerospace, automotive, and electronics.Rate this question:
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- 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
Correct Answer
C. It is soluble in concentrated nitric acidExplanation
With concentrated nitric acid, the aluminium metal is being oxidised causing the thickening of the aluminium oxide layer.Rate this question:
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- 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.
Correct Answer
D. There are two coordinate covalent bonds in the molecule.Explanation
The correct answer is "There are two coordinate covalent bonds in the molecule." This is because dimer Al2Cl6 consists of two aluminum atoms bonded to each other through two coordinate covalent bonds. In a coordinate covalent bond, one atom donates a pair of electrons to the other atom, forming a bond. In this case, the chlorine atoms act as Lewis bases, donating their lone pairs of electrons to the aluminum atoms, which act as Lewis acids. Therefore, the statement is true.Rate this question:
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- 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
Correct Answer
C. H2SExplanation
2[Al(H2O)6]3+ (aq) + 3S2- (aq) → 2Al(OH)3.3H2O (s) + 3H2S(g)Rate this question:
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- 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.
Correct Answer
B. [Al(H2O)6]3+ ion donates a proton in aqueous solution.Explanation
In the the salt solutions the complex aluminium ion behave accordingly:
[Al(H2O)6]3+ (aq) + H2O (l) ↔ [Al(H2O)5(OH)]2+ + H3O+ (aq)Rate this question:
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- 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.
Correct Answer
C. An aqueous solution of Al3+ ions has a pH = 7.Explanation
An aqueous solution of Al3+ is acidic. Hence the pH value will be lesser than 7Rate this question:
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- 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)
Correct Answer
D. Al (s) + 3H2O (l) + OH- (aq) → [Al(OH)4]- (aq) + 3/2 H2 (g)Explanation
Aluminium reacts with aqueous potassium hydroxide to form the aluminate ion and hydrogen gasRate this question:
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- 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
Correct Answer
C. Aluminium hydroxide and hydrogenExplanation
Normally, a layer of aluminium oxide is found on the surface of aluminium metal.. This oxide layer is removed by mercury(II) chloride. Aluminium will react with water to form a white precipitate of aluminium hydroxide and hydrogen gas.Rate this question:
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- 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
Correct Answer
B. OctahedronExplanation
In aqueous solution, Al3+ ion exist as an octahedral complex [Al(H2O)6]3+ .Rate this question:
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- 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
Correct Answer
C. Aluminium fluoride is an ionic compound while aluminium chloride is an covalent compoundExplanation
Aluminium fluoride is an ionic compound because it is formed by the transfer of electrons from aluminium to fluorine, resulting in the formation of positively charged aluminium ions and negatively charged fluoride ions. On the other hand, aluminium chloride is a covalent compound because it is formed by the sharing of electrons between aluminium and chlorine atoms.Rate this question:
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- 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
Correct Answer
B. The layer of oxide on the surface aluminium slows down the reaction at the beginningExplanation
The slow reaction is the reaction between the oxide layer and hydrochloric acid. Once the oxide layer is used up and the pure aluminium is exposed a vigorous reaction between aluminium and hydrochloric acid will take place.Rate this question:
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- 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
Correct Answer
C. Aluminium oxide is soluble in waterExplanation
Aluminium oxide is impermeable and non porous. hence it is insoluble in water.Rate this question:
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- 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.
Correct Answer
A. A high boiling point of aluminium fluoride.Explanation
Aluminium fluoride exist as an ionic compound. Hence high energy is needed to overcome the electrstatic force between the Al3+ and F- ions.Rate this question:
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- 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
Correct Answer
C. Keep the temperature of the electrolysis cell at 900 oCExplanation
The high current is used to keep the temperature of the electrolysis cell at 900 oC. This is because the extraction of aluminium from bauxite is an endothermic process, meaning it requires heat to proceed. By passing a high current through the cell, resistance in the cell generates heat, which helps to maintain the desired temperature of 900 oC.Rate this question:
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- 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
Correct Answer
B. To bind dyes.Explanation
Alum is used to bind dyesRate this question:
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Current Version
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Mar 20, 2023Quiz Edited by
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Feb 28, 2010Quiz Created by
Vijaya_chem
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