NEW
Font size
WorksheetsELECTROCHEMISTRY
Total questions: 16
Worksheet time: 7mins
An oxidizing agent will
increase in mass
lose electrons
be reduced
increase in oxidation number
In a redox reaction, the species that loses electrons
is called the cathode
is oxidized
gains mass at the electrode
decreases in oxidation number
As an element is oxidized, its oxidation number
decreases as electrons are lost
increases as electrons are lost
decreases as electrons are gained
increases as electrons are gained
The reaction 2NaCl → 2Na + Cl2 is an example of
a reduction reaction, only
both an oxidation and reduction reaction
an oxidation reaction, only
neither an oxidation nor a reduction reaction
Oxidation-reduction reactions occur because of the competition between particles for
electrons
positrons
protons
neutrons
Mg + PbCl2 → MgCl2 + Pb
Which statement correctly describes the oxidation and reduction that occur?
Mg is oxidized and Pb+2 is reduced
Mg is oxidized and Cl- is reduced
Mg is reduced and Cl- is oxidized
Mg is reduced and Pb+2 is oxidized
In the reactions
Sn+2 + 2Fe+3 --> Sn+4 + 2Fe+2,
the reducing agent is
Fe+3
Sn+2
Sn+4
Fe+2
Pb + 2Ag+ → Pb+2 + 2Ag
The chemical species being reduced is
Ag
Pb
Pb+2
Ag+
In the reactions
Sn+2 + 2Fe+3 → Sn+4 + 2Fe+2
the oxidizing agent is
Sn+4
Sn+2
Fe+3
Fe+2
If acidified potassium dichromate(VI) (K2Cr2O7) acts as oxidizing agent, color changes from
orange to red
orange to green
yellow to green
yellow to red
In electrolysis of copper purification, at cathode
pure copper gets deposited
the object to be electroplated is kept
impure copper gets deposited
CuSO4 gets deposited
An electrolytic cell uses electrical energy to drive
chemical reaction
physical reaction
no reaction
none of above
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
When water is electrolyzed, gas collected at cathode, is
sulphur
oxygen
hydrogen
sulphur dioxide
Ions discharged in electrolysis depends on
relative electrode potential
concentration of ions
relative electrode charge
density of electrolyte
In electrolysis, particles which move towards cathode are called
anions
cations
photons
positrons
