Have an account?
Skip to Content
Build your own quiz
Suggestions for you
40 questions
Show Answers
See Preview
- 1. Multiple Choice
The oxidation number of sulphur in the S2O32- ion is
+2
+4
+6
+8
- 2. Multiple Choice
The oxidation state of Br in BrO3- ion is
1+
2+
3+
5+
- 3. Multiple Choice
Consider the following M(s) --> M2+ (aq) In the reaction represented above, metal M: i. has been oxidised
ii. has increased in oxidation number
iii. has gained electrons
i only
i and ii only
ii and iii only
1, ii, and iii
- 4. Multiple Choice
Which of the following is true about a reducing agent?
It causes an increase in oxidation number
It causes a loss of electrons
Its oxidation number increases
It gains electrons
- 5. Multiple Choice
In which of the following reactions does the oxidation number of nitrogen show the greatest increase?
2 NO(g) + O2 (g) -->
2 NO2 (g)
4NO2(g) + O2(g) + 2H2O(l) --> 4 HNO3 (aq)
N2 (g) + 3 H2 --> 2NH3(g)
2NH3(g) + 3CuO (S) --> N2(g) + 3 Cu (s) + 3H2O (l)
- 6. Multiple Choice
Which of the following reactions is not a redox reaction?
2Na (s) + 2H2O(l) ----> 2 NaOH (aq) + H2(g)
Fe (s) + 2HCl (aq) ----> FeCl2(aq) + H2(g)
MgO(s) + H2SO4 (aq) --> MgSO4(aq) + H2O(l)
C(s) + O2(g) --> CO2(g)
- 7. Multiple Choice
In the following reaction Cu (s) + 4HNO3 (aq) ---> Cu(NO3)2(aq) + 2NO2(g) + 2 H2O(l)
Which of the following statement about copper is true?
Copper undergoes reduction and its oxidation number decreases
copper undergoes oxidation and its oxidation number increases
Copper undergoes reduction and its oxidation number increases
Copper undergoes oxidation and its oxidation number increases
- 8. Multiple Choice
In separated experiments, sulphur dioxide was bubbled into acidified solutions of potassium dichromate (vi) . Which of the following pairs correctly describes the colour changes observed in the experiment?
colour of potassium dichromate (vI) changes from orange to green and the colour of potassium manganate (vii) from colourless to purple
colour of potassium dichromate (vI) changes from orange to green and the colour of potassium manganate (vii) from purple to colourless
colour of potassium dichromate (vI) changes from green to orange and the colour of potassium manganate (vii) from colourless to purple
colour of potassium dichromate (vI) changes from green to orange and the colour of potassium manganate (vii) from purple to colourless
- 9. Multiple Choice
When acidified hydrogen peroxide solution is added to iron (ii) sulphate solution
A pale green solution is formed
the iron(ii) ion is oxidised to the iron(iii) ion
the oxidation number of the iron (ii) ion decreases
the acidified hydrogen peroxide is acting as a reducing agent
- 10. Multiple Choice
The figure shwos the label on a multivitamin and mineral supplement bottle, Much of the information has been left out. State what you would expect to observe if a solution is made of one of the tablets and acidified hydrogen peroxide is added to the soluiton
the solution will turn yellowish brown
the solution will turn colourless
There will be no change in the solution
the solution will turn blue
- 11. Multiple Choice
The half equation which represents the reaction when potassium iodide reacts with hydrogen peroxide is
2I2-(aq) --> I2(aq) + 2e-
2I-(s) --> I2(aq) + 2e-
2I-(aq) --> I2(aq) + 2e-
3I-(aq) --> I2(aq) + 2e-
- 12. Multiple Choice
The oxidation number of the Cu in the formula CuO is
1+
1-
2-
2+
- 13. Multiple Choice
Name the substance which has been oxidised in the reaction shown.
Zn (s) + 2HCl (aq) --> ZnCl2(aq) + H2(g)
Zn
HCl
ZnCl2
H2
- 14. Multiple Choice
Identify the substance which has been oxidised in the reaction shown.
2Fe2+ (aq) + Cl2(g) -->2 Fe3+(aq) + 2Cl-(aq)
Fe3+
Fe2+
Cl2
Cl-
- 15. Multiple Choice
Choose the substance which has been oxidised in the reaction shown.
2NH3 (aq) + 3CuO(s) --> N2(g) + 3Cu(s) + 3H2O (l)
N3-
Cu2+
O2-
Cu
- 16. Multiple Choice
When potassium permanganate is reduced the colour changes from
Green to orange
Orange to green
Colourless to purple
Purple to colourless
- 17. Multiple Choice
Oxidation is defined as
the addition of oxygen
The removal of electrons
the increase in oxidation number
All three of the other options
- 18. Multiple Choice
From the equation : Cl2(g) + 2Br- (aq) --> 2 Cl- (aq) + Br- (g). The oxidation number of Cl and Cl - are
Cl = -1 and Cl- = -1
Cl = 1 and Cl- = -1
Cl = 0 and Cl- = +1
Cl = 0 and Cl- = -1
- 19. Multiple Choice
The reducing agent in the reaction: 2PbO (s) + C (s) --> Pb(s) + CO2
Pb2+
C
O2-
Pb
- 20. Multiple Choice
Oxidation refers to the _____of electrons
loss
gain
sharing
none of the listed options
- 21. Multiple Choice
Reduction refers to the ______ of electrons
Loss
accepting
sharing
holding
- 22. Multiple Choice
An oxidising agent is one which _________ electrons
retains
shares
loses
gains
- 23. Multiple Choice
During oxidation the oxidising agent is
changed
oxidised
reduced
lost
- 24. Multiple Choice
A substance which is oxidised during a redox reaction is
an oxidising agent
a non-reactive agent
a reactive agent
a reducing agent
- 25. Multiple Choice
A reducing agent is one which __________ electrons
retains
accepts
shares
loses
- 26. Multiple Choice
The oxidation number of elements in group 1 is always
-1
-2
+2
+1
- 27. Multiple Choice
The oxidation state of an element or compound is always
unknown
zero
one
two
- 28. Multiple Choice
When potassium iodide is oxidised it turns a __________ colour
brown
red
blue
white
- 29. Multiple Choice
The substance which is produced when potassium iodide is oxidised is
I-
K+
I2
K
- 30. Multiple Choice
A substance which acts as both an oxidising and reducing agent is
hydrogen peroxide
Potassium permanganate
Iron (ii) sulphate
Iron (iii) sulphate
- 31. Multiple Choice
Metals act as ___________________ agents
oxidising
reducing agents
reactive
none of the other option
- 32. Multiple Choice
The process of photosynthesis can be considered a _____________ reaction
addition
reduction
oxidation
displacement
- 33. Multiple Choice
The process of respiration can be considered a _____________ reaction
synthesis
reduction
oxidation
displacement
- 34. Multiple Choice
In which reaction does the oxidation state of iron remain unchanged
2Fe + 3Cl2 -->2 FeCl3
2FeCl2 + 3Cl2 -->2 FeCl3
Fe + 2FeCl3 --> 3FeCl2
Fe2O3 + 6HCl --> 2 FeCl3 + 3H2O
- 35. Multiple Choice
When a metal atom becomes an ion, it
gains electrons and is reduced
gains protons and is oxidised
loses electrons is oxidised
loses protons and is reduced
- 36. Multiple Choice
In which of the reactions is the underlined substance acting as a reducing agent
Chlorine + iron(ii) chloride --> iron(iii) chloride
Hydrogen + Copper(ii) Oxide --> Copper + water
Hydrogen Chloride + magnnesium oxide --> magnesium chloride + water
Zinc oxide + carbon monoxide ---> Zinc + carbon dioxide
- 37. Multiple Choice
Oxidation is 1. again of oxygen ii. a gain of electrons iii. a decrease in oxidation number
1 only
i and ii only
1, ii, and iii only
iii only
- 38. Multiple ChoiceWhich of the following reactions is balanced by both mass and charge?Fe+2 + Al →Fe + Al+3Cu + Fe+2 → Cu+1 + Fe+3F2 + Br- --> F- + Br2Fe+2 + 2 Cu --> 2 Cu+ + Fe
- 39. Multiple Choice
Gaining oxygen is an example of...
oxidation
reduction
- 40. Multiple Choice
When a gas changes iron (III) oxide to iron (II) oxide, it shows that the gas is
a reducing agent
an oxidizing agent
a combustible gas
a diffusible gas
- Answer choicesTagsAnswer choicesTags