MCQ Questions

Question No. 1

Give one term for each description.

Answer :

a) The product of an oxidation reaction

b) The decomposition of water by using electricity

c) The industrial process to produce oxygen

d) The allotrope of oxygen with three atoms

e) The chemical process in which oxygen is used in the cells of living organisms

Question No. 2

The following questions involve the elements in Group 16 of the Periodic Table.

Answer :

a) Name the elements in Group 16, giving their chemical symbols and their atomic numbers.

b) Classify the Group 16 elements as metals, non-metals or metalloids.

c) How many electrons do Group 16 elements have in their outer energy shell?

d) What is the main oxidation state of Group 16 elements?

e) Name the main uses of selenium, tellurium and polonium

Question No. 3

Give the electron configuration for oxygen.

Answer :

a) Give the electron configuration for oxygen.

b) Name the isotopes of oxygen and give their chemical formulae.

c) Explain how ozone is formed in the upper atmosphere.

d) Give the oxidation numbers of oxygen in: i) O₂ ii) MgO₂ iii) H₂SO₄ iv) H₂O₂ v) KO₂ vi) F₂O

Question No. 4

Name two ways in which oxygen is produced in the atmosphere.

Answer :

a) Method 1 – and give the associated chemical equation.

b) Method 2 – and give the associated chemical equation.

Question No. 5

Name two methods that can be used to prepare oxygen in the laboratory and give balanced equations for the reactions.

Answer :

a) Laboratory method 1 – equation.

b) Laboratory method 2 – equation.

Question No. 6

Oxygen can be prepared by the electrolysis of water.

Answer :

a) What must be added to the water to be able to conduct a current?

b) Give a balanced equation for the reaction.

c) At what electrode will the oxygen be produced?

Question No. 7

Oxygen can be prepared by the decomposition of H₂O₂.

Answer :

a) Make a labelled drawing of the apparatus that is used to produce oxygen in the laboratory.

b) How would you test that the gas is oxygen?

Question No. 8

Oxygen can react with most elements.

Answer :

a) Give one example of a non-metal and one example of a metal that will react with oxygen.

b) Write balanced equations for the examples in (a).

c) State if the products in (a) are soluble in water and if the solutions will be acidic or basic.

Question No. 9

Methane combusts in oxygen in the air. Write a balanced equation for the reaction.

Answer :

Question No. 10

Write balanced equations for the reactions of oxygen with:

Answer :

a) Aluminium

b) Magnesium

c) Fluorine to form F₂O₂

d) Chlorine to form Cl₂O₇

e) Iron to form Fe₃O₄

f) Lithium

g) Carbon to form CO

h) Nitrogen to form N₂O

Chapter

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