Stpm Inorganic Chemistry: Aluminium

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  • 1/15 Questions
     Which of the following properties does not apply to modern ceramics? - ProProfs

     Which of the following properties does not apply to modern ceramics?

    • High melting point
    • Application in engineering
    • Corrode readily
    • Very hard
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Stpm Inorganic Chemistry: Aluminium - Quiz
About This Quiz

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.

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  • 2. 

    The reaction between aluminium foil and hydrochloric acid is slow in the beginning. After a few minutes, the rate increases. The reason is   

    • One of the products act as a catalyst

    • The layer of oxide on the surface aluminium slows down the reaction at the beginning

    • The hydrolysis of aluminium ions decreases the rate of reaction

    • The chloride ion has a small size and hence difficult to be polarized by the aluminium ion

    Correct Answer
    A. The layer of oxide on the surface aluminium slows down the reaction at the beginning
    Explanation
    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.

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  • 3. 

    Which statement is not true concerning the aluminium ion, Al3+?

    • The Al3+ ion has a high charge density and developes covalent character in its ionic compounds

    • In water, the Al3+ ions exist as a complex ion [Al(H2O)6]3+.

    • An aqueous solution of Al3+ ions has a pH = 7.

    • If hydroxide ions are added to a solution of an aluminium salt, a white precipitate is formed.

    Correct Answer
    A. 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 7

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  • 4. 

    Which of the following statements is true of dimer Al2Cl6?

    • It is an ionic compound.

    • Aluminium atom undergoes sp2 hybridisation.

    • It is a white solid which melts when heated.

    • There are two coordinate covalent bonds in the molecule.

    Correct Answer
    A. 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.

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  • 5. 

      Which of the following is true?    

    • Both aluminium fluoride and aluminium chloride are covalent compounds

    • Both aluminium fluoride and aluminium chloride are ionic compounds

    • Aluminium fluoride is an ionic compound while aluminium chloride is an covalent compound

    • Aluminium fluoride is an covalent compound while aluminium chloride is an ionic compound

    Correct Answer
    A. Aluminium fluoride is an ionic compound while aluminium chloride is an covalent compound
    Explanation
    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.

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  • 6. 

    Which of the following statements about aluminium is not true?

    • It is extracted by electrolysis.

    • Its chloride is covalent.

    • It is soluble in concentrated nitric acid

    • It is soluble in sodium hydroxide solution

    Correct Answer
    A. It is soluble in concentrated nitric acid
    Explanation
    With concentrated nitric acid, the aluminium metal is being oxidised causing the thickening of the aluminium oxide layer.

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  • 7. 

      When sodium sulphide is added to an aqueous solution of aluminium chloride, the gas evolved is

    • Cl2

    • CO2

    • H2S

    • HCl

    Correct Answer
    A. H2S
    Explanation
    2[Al(H2O)6]3+ (aq) + 3S2- (aq) → 2Al(OH)3.3H2O (s) + 3H2S(g)

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  • 8. 

     Why is the aqueous solution of an aluminium salt acidic?

    • [Al(H2O)6]3+ ion receives a proton in aqueous solution.

    • [Al(H2O)6]3+ ion donates a proton in aqueous solution.

    • [Al(H2O)6]3+ ion disproportionate and produces H+ (aq) ions.

    • Acidic [Al(H2O)6OH]2+ ions are produced in solution.

    Correct Answer
    A. [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)

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  • 9. 

    In the extraction of aluminium from bauxite, a current of 40 000 A is used. The function of the high current is to   

    • Prevent the discharge of Na+ from the dissociation of cryolite

    • increase the yield of aluminium

    • Keep the temperature of the electrolysis cell at 900 oC

    • increase the rate of reaction

    Correct Answer
    A. Keep the temperature of the electrolysis cell at 900 oC
    Explanation
    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.

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  • 10. 

     Which equation represents the reaction between aqueous aluminium and potassium hydroxide?    

    • Al (s) + 4OH- (aq) → [Al(OH)4]- (aq)

    • Al (s) + 6OH- (aq) → [Al(OH)6]3- (aq)

    • Al (s) + 4H2O (l) → [Al(H2O)4]- (aq)

    • Al (s) + 3H2O (l) + OH- (aq) → [Al(OH)4]- (aq) + 3/2 H2 (g)

    Correct Answer
    A. 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 gas

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  • 11. 

      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  

    • aluminium oxide and hydrogen

    • Aluminium chloride and hydrogen

    • Aluminium hydroxide and hydrogen

    • Aluminium hydroxide and oxygen

    Correct Answer
    A. Aluminium hydroxide and hydrogen
    Explanation
    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.

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  • 12. 

     Aluminium oxide reacts with acids and with alkalis. Which statement is not true?

    • The lattice energy for aluminium oxide is high

    • Aluminium oxide has an ionic bond with covalent character

    • Aluminium oxide is soluble in water

    • Aluminium oxide is an amphoteric oxide

    Correct Answer
    A. Aluminium oxide is soluble in water
    Explanation
    Aluminium oxide is impermeable and non porous. hence it is insoluble in water.

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  • 13. 
     Zeolite is an aluminium compound with many uses. Which of the following is not one of its uses?     - ProProfs

     Zeolite is an aluminium compound with many uses. Which of the following is not one of its uses?    

    • To separate straight chained hydrocarbons from branched hydrocarbons.

    • To bind dyes.

    • To synthesis molecules of a specific size

    • As a cation exchanger

    Correct Answer
    A. To bind dyes.
    Explanation
    Alum is used to bind dyes

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  • 14. 

    Aluminium sulphate solution contains aqueous aluminium ions. What is the shape of the Al3+   ions?     

    • Tetrahedron

    • Octahedron

    • Square planar

    • Trigonal planar

    Correct Answer
    A. Octahedron
    Explanation
    In aqueous solution, Al3+ ion exist as an octahedral complex [Al(H2O)6]3+ .

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  • 15. 

    Which statement cannot be explained by the polarising power of aluminium ions, Al3+?    

    • A high boiling point of aluminium fluoride.

    • Amphoteric nature of aluminium hydroxide

    • The aluminium ion can pull the bonded electron pair in the water molecule.

    • 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.

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  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 28, 2010
    Quiz Created by
    Vijaya_chem
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