AQA A Level Chemistry

Topic Questions

6.1 Properties of Period 3 Elements & their Oxides (A Level only)

11 mark

Which of the following about sodium oxide, Na2O, is correct?

 

Bonding in Na2O

pH of solution

A

Covalent

9

B

Ionic

14

C

Ionic

10

D

Covalent

12

 

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21 mark

Which of the following statements about aluminium oxide is correct?

  • Aluminium oxide forms an alkaline solution

  • Aluminium oxide has the highest melting point of the Period 3 oxides

  • Aluminium oxide is amphoteric

  • Aluminium oxide has a macromolecular structure

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31 mark

Which of the following is the correct oxidation number for sulfur in H2SO3?

  • +2

  • +4

  • +6

  • +8

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41 mark

Which equation for the reaction of the Period 3 non-metal oxides is not correct?

  • SO2 (g) + 2NaOH (aq) → Na2SO3 (aq) + H2O (l)

  • P4O10 (s) + 12NaOH (aq) → 4Na3PO4 (aq) + 6H2O (l)

  • P4O10 (s) + 12OH- (aq) → 4PO43-(aq) + 6H2O (l)

  • SO3 (g) + 2OH- (aq) → SO32- (aq) + H2O (l)

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51 mark

Which of the following statements about the melting points of sodium oxide, magnesium oxide and aluminium oxide is correct?

  • The melting point of Al2O3 is the highest

  • The melting point of Na2O3 is lower than that of the MgO due to the difference in size and charge of the cations

  • Na2O has a higher melting point than MgO

  • The covalent character in Al2O3 leads to an increased melting point 

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11 mark

Which of the following statements about Period 3 and their oxides is correct?

  • Silicon dioxide is a white powder that when added to water creates an acidic solution

  • Magnesium burns in oxygen giving off a bright light and forming a basic oxide that can react with water to form a solution with a pH of 13

  • Sulfur burns in oxygen to form a colourless gas of which the molecules have a trigonal planar shape 

  • Sodium peroxide is formed during spontaneous combustion when sodium oxide reacts with oxygen 

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21 mark

When sulfuric acid, H­2­SO­4, reacts with sodium hydroxide, two possible anions are formed.

What is the bond angle in the shapes of these two anions?

  • 90°

  • 107°

  • 109.5°

  • 180°

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31 mark

Phosphoric acid, P4O10, reacts with water to produce an oxyacid.

What is the oxidation number of phosphorus in the oxyacid formed?

  • +4

  • +5

  • +6

  • +7

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41 mark

An excess of magnesium oxide is reacted with phosphoric(V) acid.

The correct balanced equation for the reaction is

  • MgO (s)  + H3PO4 (aq) → MgHPO4 (aq)  + H2O (l)

  • 3MgO (s)  + 2H3PO4 (l)  → Mg3(PO4)2 (aq) + 2H2O (l)

  • 6MgO (s) + P4O10 (s) → 2Mg3(PO4)2 (s)

  • 3MgO (s) + 2H3PO4 (aq)  → Mg3(PO4)2 (aq)  + 3H2O (l) 

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51 mark

Sulfur dioxide reacts with water to form sulfuric(IV) acid.

Which equation best represents the reaction that occurs once this product has been made?

  • SO2 + H2O ⇌ H+ + HSO3- 

  • SO2 + H2O ⇌ 2H+ + HSO3- 

  • SO2 + H2O ⇌ H2SO3

  • SO3 + H2O → H2SO4

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11 mark

Which element forms a covalent oxide that can react with a base?

  • Sodium

  • Magnesium

  • Phosphorus

  • Aluminium

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21 mark

Which of the following is correct?

 

Oxidation number of sulfur in SO3

Oxidation number of silicon in CaSiO3

A

+4

+6

B

+3

+1

C

+4

-4

D

+6

+4

 

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31 mark

Which of the following equations involving aluminium oxide is correct?

  • Al2O3 + HCl → AlCl3 + 3H2O

  • Al2O3 + H2O → Al(H2O)3(OH)3

  • Al2O3 + 2NaOH + 3H2O → 2NaAl(OH)4

  • Al2O3 + 6H2O → [Al(H2O)6]3+

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41 mark

The period three oxide with the highest melting point is:

  • Aluminium oxide

  • Magnesium oxide

  • Silicon dioxide

  • Sodium oxide 

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51 mark

Magnesium oxide and sodium oxide are both basic oxides of Period 3 elements. Which of the following is correct?

  • MgO has a pH 12

  • 3Na2O + P4O10 → 4Na3PO4

  • 6MgO + P4O10 → 2Mg3(PO4)2

  • Na2O has a pH of 10

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