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SECTION A [Time = 60 minutes, Submit before 9h00] Question 1 (26 minutes) 1.1 Consider the following compounds $BaO_2$, $MnO_2$, $KO_2$ and $Cl_2O_7$ (a) Indicate whether each of the given oxides is basic, neutral, acidic or amphoteric (2) (b) Write a balanced equation for the reaction of $KO_2$ with water (1) (c) Write a balanced equation for the preparation of $BaO_2$ (1) (d) Which of the oxides is a peroxide? (1) (e) Explain why $MnO_2$ is black-brown in colour (2) (f) Draw the Lewis structure for $Cl_2O_7$ (2) 1.2 Phosphorus burns in air to form different types of oxides, one of the oxides is shown in the diagram below P O P O P P O P O (a) Write the general formula of this oxide. (1) (b) Why is this oxide acidic? (1) (c) What is the oxidation state of phosphorus in this oxide? (1) (d) What is the geometry around each phosphorus atom? (1) [13]

          SECTION A [Time = 60 minutes, Submit before 9h00]
Question 1 (26 minutes)
1.1 Consider the following compounds
$BaO_2$, $MnO_2$, $KO_2$ and $Cl_2O_7$
(a) Indicate whether each of the given oxides is basic, neutral, acidic or
amphoteric
(2)
(b) Write a balanced equation for the reaction of $KO_2$ with water
(1)
(c) Write a balanced equation for the preparation of $BaO_2$
(1)
(d) Which of the oxides is a peroxide?
(1)
(e) Explain why $MnO_2$ is black-brown in colour
(2)
(f) Draw the Lewis structure for $Cl_2O_7$
(2)
1.2 Phosphorus burns in air to form different types of oxides, one of the oxides is
shown in the diagram below
P
O
P
O
P
P
O
P
O
(a) Write the general formula of this oxide.
(1)
(b) Why is this oxide acidic?
(1)
(c) What is the oxidation state of phosphorus in this oxide?
(1)
(d) What is the geometry around each phosphorus atom?
(1)
[13]

SECTION A [Time = 60 minutes, Submit before 9h00]
Question 1 (26 minutes)
1.1 Consider the following compounds
BaO2, MnO2, KO2 and Cl2O7
(a) Indicate whether each of the given oxides is basic, neutral, acidic or
amphoteric
(2)
(b) Write a balanced equation for the reaction of KO2 with water
(1)
(c) Write a balanced equation for the preparation of BaO2
(1)
(d) Which of the oxides is a peroxide?
(1)
(e) Explain why MnO2 is black-brown in colour
(2)
(f) Draw the Lewis structure for Cl2O7
(2)
1.2 Phosphorus burns in air to form different types of oxides, one of the oxides is
shown in the diagram below
P
O
P
O
P
P
O
P
O
(a) Write the general formula of this oxide.
(1)
(b) Why is this oxide acidic?
(1)
(c) What is the oxidation state of phosphorus in this oxide?
(1)
(d) What is the geometry around each phosphorus atom?
(1)
[13]

Added by Manuel I.

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