Lesson 15B.1
15B.1 Vanadium and dichromate redox chemistry Quiz: Pearson Edexcel Chemistry, Unit 15
20 questions
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Lesson 15B.1, Vanadium and dichromate redox chemistry: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 15: Transition Metals, written with Revision Ninja.
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The 20 questions
-
What colour is the vanadium(V) ion, V(+5), in its compounds?
- Yellow
- Green
- Blue
- Violet
-
What colour is vanadium(IV) in its compounds?
- Green
- Violet
- Yellow
- Blue
-
Which metal reduces vanadium(V) stepwise down to vanadium(II) in acidic conditions?
- Copper
- Zinc
- Iron
- Silver
-
What colour is the chromate(VI) ion, CrO4 2-?
- Green
- Yellow
- Orange
- Pink
-
What colour is the dichromate(VI) ion, Cr2O7 2-?
- Yellow
- Green
- Blue
- Orange
-
What colour change occurs when yellow chromate(VI) solution is acidified?
- Orange to yellow
- Yellow to orange
- Yellow to green
- Orange to green
-
What is the oxidation number of vanadium in the VO2+ ion?
- +4
- +3
- +2
- +5
-
What is the oxidation number of chromium in both CrO4 2- and Cr2O7 2-?
- +6 and +7
- +3 and +6
- +6 in both
- +4 and +6
-
Which ion is favoured when a chromate-dichromate equilibrium mixture is acidified?
- Chromium(II)
- Chromate(VI)
- Chromium(III)
- Dichromate(VI)
-
What is E°cell for the reduction of Cr3+ to Cr2+ by zinc?
- -1.17 V
- -0.35 V
- +0.35 V
- +1.17 V
-
Which reagent oxidises Cr3+ ions to chromate(VI) ions in alkaline solution?
- Zinc metal
- Potassium manganate(VII)
- Hydrochloric acid
- Hydrogen peroxide
-
What is the oxidation state of vanadium in V2O5?
- +4
- +5
- +3
- +2
-
Because its Cr3+/Cr2+ electrode potential is negative (-0.41 V), Cr2+ acts as a strong what?
- Ligand
- Oxidising agent
- Reducing agent
- Catalyst
-
With E° = +1.33 V, acidified dichromate(VI) ions act as a strong what?
- Reducing agent
- Base
- Ligand
- Oxidising agent
-
In the reaction of dichromate with Fe2+ in acid, how many moles of Fe2+ react with 1 mol of Cr2O7 2-?
- 1
- 6
- 3
- 2
-
How many moles of Fe2+ react with 25.0 cm3 of 0.0200 mol dm-3 K2Cr2O7?
- 1.00 x 10^-3 mol
- 1.20 x 10^-2 mol
- 3.00 x 10^-3 mol
- 5.00 x 10^-4 mol
-
What property determines each step in the reduction of vanadium ions?
- Electrode potential
- Ionic radius
- Activation energy
- Hydration enthalpy
-
Which species forms when acid is added to yellow chromate(VI) solution?
- Cr2O7 2-
- CrO4 2-
- Cr3+
- Cr2+
-
Why does reducing dichromate(VI) with zinc produce multiple colour changes?
- Temperature changes
- Ligand substitution
- Multiple oxidation states
- Gas evolution
-
What colour change is seen when atmospheric oxygen oxidises V2+ to V3+?
- Yellow to blue
- Blue to yellow
- Green to violet
- Violet to green
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