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- 1. Multiple Choice
Given their standard reduction potentials, which of the species is going to be oxidized?
Cu2+/Cu = 0.34V
Zn2+/Zn = -0.76V
Cu
Zn
CuSO4
ZnSO4
- 2. Multiple Choice
What reaction occurs at the anode?
Ag+/Ag = 0.80V
Ni2+/Ni = -0.25V
Ag+ + e- →Ag
Ag → Ag+ + e-
Ni2+ + 2e- → Ni
Ni → Ni2+ + 2e-
- 3. Multiple Choice
What is a reducing agent?
It is the species that gets reduced -- gains electrons.
It is the species that gets oxidized -- loses electrons.
It is the species that creates electrons.
It is the species that destroys electrons.
- 4. Multiple Choice
In the following reaction
Sn+2 + 2Fe+3 → Sn+4 + 2Fe+2
the oxidizing agent is....
Sn+4
Sn+2
Fe+3
Fe+2
- 5. Multiple Choice
When water is electrolyzed, gas collected at cathode, is
sulphur
oxygen
hydrogen
sulphur dioxide
- 6. Multiple ChoiceWhich direction do the electrons flow in wire X and which metal is oxidized?ABCD
- 7. Multiple Choice
Galvanic cells convert
mechanical energy in to electrical energy
potential energy in to electrical energy
electrical energy in to chemical energy
chemical energy in to electrical energy
- 8. Multiple Choice
Consider this cell.
Select all true statements
Zinc is a more reactive metal than copper
Cu2+ is a stronger oxidising agent that Zn2+
The cell potential is the sum of the two electrode potentials
The copper electrode will get bigger as current flows
The zinc electrode will get smaller as current flows
- 9. Multiple ChoiceIs this an example of corrosion?YesNo
- 10. Multiple Choice
Rusting is a special term, given to the corrosion metal is... .
Au
Pt
Fe
Ag
- 11. Multiple Choice
What two things cause Iron to Rust ?
Air and Oxygen
Oxygen and Water
Water and Carbon dioxide
Carbon dioxide and Air
- 12. Multiple Choice
Which diagram shows the most favourable conditions for rust to appear on the nail?
A
B
C
D
- 13. Multiple Choice
Rusting can be prevented by
Alloying
Tinning
Galvanizing
All of above
- 14. Poll
Observe the picture...and select the appropriate options
Forward reaction= Extraction of metals from ore
Backward reaction= Corrosion
Corrosion phenomenon will be Spontaneous
Metals are more stable in the Ore form (naturally occurring form)
- 15. Open Ended
Name any way of preventing corrosion other than Galvanizing, tinning & alloying. (very commonly applied method at every home)
- Answer choicesTagsAnswer choicesTags