Lesson 2.1.5
2.1.5 Redox Quiz: OCR Chemistry, Unit 1
20 questions
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Lesson 2.1.5, Redox: 20 multiple choice questions for the OCR Chemistry (H432), Unit 1: Foundations in chemistry, written with Revision Ninja.
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The 20 questions
-
What is the oxidation number of manganese in MnO4-?
- +6
- +2
- +7
- +4
-
What is the oxidation number of sulfur in the sulfate ion, SO4 2-?
- +2
- +4
- -2
- +6
-
What is the oxidation number of chromium in Cr2O7 2-?
- +12
- +6
- +2
- +3
-
Which is the correct formula for iron(III) oxide?
- Fe2O3
- Fe3O4
- FeO
- Fe3O2
-
What happens to an element's oxidation number during an oxidation reaction?
- It decreases
- It remains unchanged
- It increases
- It becomes zero
-
What is the oxidation number of hydrogen in sodium hydride, NaH?
- -1
- 0
- -2
- +1
-
What is the oxidation number of oxygen in hydrogen peroxide, H2O2?
- -2
- -1
- +1
- 0
-
In Zn + 2HCl → ZnCl2 + H2, which species is the oxidising agent?
- Zn metal
- H+ ions from HCl
- Cl- ions
- ZnCl2
-
In 2Al + 6HCl → 2AlCl3 + 3H2, what is the change in oxidation number of aluminium?
- +2
- +3
- +6
- -3
-
What is the stoichiometric coefficient of Fe3+ when balancing Fe3+ + Mg -> Fe2+ + Mg2+?
- 3
- 1
- 2
- 4
-
In 5Fe2+ + MnO4- + 8H+ → 5Fe3+ + Mn2+ + 4H2O, how many moles of MnO4- are needed to oxidise 0.0500 mol of Fe2+?
- 0.0100 mol
- 0.00500 mol
- 0.0500 mol
- 0.0250 mol
-
In the reaction 2Na + Cl2 -> 2NaCl, which element is reduced?
- Neither element
- Sodium
- Chlorine
- Sodium chloride
-
What volume of hydrogen gas at RTP forms when 0.100 mol of magnesium reacts completely with excess dilute HCl?
- 4.80 dm3
- 24.0 dm3
- 0.100 dm3
- 2.40 dm3
-
What is the oxidation number of nitrogen in the nitrite ion, NO2-?
- +3
- +4
- +1
- +2
-
What is the systematic name for Cu2O?
- copper(II) oxide
- dicopper oxide
- copper(I) peroxide
- copper(I) oxide
-
What is the formula of chromium(III) chloride?
- Cr3Cl
- CrCl3
- CrCl2
- CrCl6
-
What is the formula of the chlorate(III) ion?
- ClO4-
- ClO-
- ClO2-
- ClO3-
-
Which half-equation represents the reduction of MnO4- in acidic solution?
- MnO4- + 8H+ + 5e- → Mn2+ + 4H2O
- MnO4- + 8H+ → Mn2+ + 4H2O
- MnO4- + 4H2O + 5e- → Mn2+ + 8H+
- MnO4- + 8H+ + 3e- → Mn2+ + 4H2O
-
What term describes a reaction where the same element is simultaneously oxidised and reduced?
- Disproportionation
- Thermal decomposition
- Neutralisation
- Precipitation
-
0.00200 mol of Cr2O7 2- oxidises Fe2+ to Fe3+ in acid. How many moles of Fe2+ are oxidised?
- 0.00200 mol
- 0.00600 mol
- 0.0120 mol
- 0.0400 mol
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