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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Properties of Period 3 Elements & their Oxides (AQA A Level Chemistry)
Exam Questions
3 hours30 questions21 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 Na2O 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 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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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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