WorksheetsElectrolysis
Total questions: 50
Worksheet time: 9mins
Cations are ....
Positive
Negative
No charge
Is the oxidizing electrode
Cathode
Anode
Non electrolytes have ..
Ions only
Ions & molecules
Molecules only
In strong electrolytes
The bulb glow dim
The bulb does not glow
The bulb glow brightly
Weak electrolytes have ..
Ions only
Ions & molecules
Molecules only
Is an example of weak electrolyte
Distilled water
Ammonium hydroxide
Sodium hydroxide
Is an example of non- electrolyte
Distilled water
Acetic acid
Sodium hydroxide
Is a negative electrode
Anode
Cathode
These accept or gain electrons to the respective electrodes.
Anions
Cations
Ionization takes place in
Electrovalent compounds
Covalent compounds
Molten solution
Water
Are liberated at the cathode and are hence called electropositive elements
Hydrogen
Anions
Non metals
Metals
In solid sodium chloride the ions are held together by a strong ..
Covalent bond
Ionic bond
Electrostatic bond
Does not conduct in gaseous or liquid state but conducts in water
Ammonia
Sulphuric acid
Lead bromide.
Are good conductors of electricity in solid state..
Non metals
Metals
Electrolytes
Hydrogen chloride solution in nature is
Polar covalent
Ionic
Electrovalent
Out of Al2+, Ag1+, Cu2+, & Pb2+ which ions will be discharged at the cathode first.
Ag1+
Cu2+
Pb2+
Al2+
Anions _____ electrons at the anode
Accept
Donate
Involves separation of ions
Ionisation
Electrolytic dissociation
Out of NO3-, OH-, Br- & Cl1- ions which are discharged at anode first..?
NO2-
OH-
Br-
Cl-
Is an example of an active electrode
Iron
Nickel
Graphite
Platinum
In the electrolysis of dil.Nacl soln the following is discharged at the cathode
Hydrogen
Sodium
Chlorine
Sulphuric acid is preferred over nitric acid for acidification since it is ..
Volatile
Non- volatile
Intefers in reaction
The blue color of aq. CuSO4 fades during electrolysis when ___ electrode is used
Copper
Platinum
Graphite
The article to be electroplated is always placed at the ...
Cathode
Anode
The electrode which always diminishes in mass..?
Cathode
Anode
Metals which generally refined by electrolysis are..
Iron
Copper
Aluminium
The particles present in acetic acid that makes it weak-electrolyte
Molecules
Ions
Ions and molecules
The gas produced at the anode during electrolysis of acidification water.
Oxygen
Hydrogen
Sulphurdioxide gas
Sodium argentocyanide is preffered over silver nitrate during electroplating with silver as it..
Provides fast electroplating
Provides slow deposition of metal
Provides attractive coating
According to Arrhenious theory the amount of electricity conducted by the electrolyte depends on the ___ of ions in solution.
Nature
Concentration
The observation seen when fused lead bromide is electrolysed is:
Reddish brown vapors at cathode & silvery Grey deposit at the anode.
Reddish brown vapors at anode & silvery Grey deposit at the cathode.
As we descend the electrochemical series containing anions, the tendency of the anions to get ___ at the anode increases.
Oxidised
Reduced
Reaction at the anode during electrolysis of aq. Copper sulphate using platinum electrode.
Cu - 2e- -> Cu 2+
OH 1- - 1e- - > OH.
SO4 2- + 2e- --> SO4
Reaction at anode during electroplating with Nickel..
Ni - 2 e- -- > Ni 2+
Ni 2+ + 2e- --- > Ni.
The metallic electrode which does not take part in an electrolytic reaction..
Copper
Silver
Iron
Nickel
Electrolysis of molten lead bromide is a redox reaction since it involves ..
Reduction of both the electrodes
Oxidation at the cathode and reduction at the anode
Oxidation at the anode and reduction at the cathode.
Since it is entirely made up of ions
Electrolysis of acidulated water is considered an example of catalysis since..
Dil. Sulphuric acid helps dissociate pure water into H+ & OH1- ions.
Acidulated water acts as a catalyst
Oxidation at the anode and reduction at the cathode takes place
it is entirely made up of ions
The article to be electroplated is always placed at the cathode since..
Otherwise Loss of electrons take place.
The metal is always deposited at the cathode
Metal is always deposited at the anode.
Electroplating is done so as to ...
Prevent rusting
To make the article attractive.
Make the article strong
Lower is the position of anion in the electrochemical series..
Greater is the tendency to get discharged
Lower is the tendency to get discharged.
Electrolytic dissociation involves..
Separation of ions
Formation of charged ions
Removal of electrons
In the electrolysis of conc. NaCl soln , the following is discharged at the anode.
Hydrogen
Chlorine
Oxygen
Sodium.
During the electrolysis of lead bromide the crucible is made up of silica since..
It is very hard.
It is conductor of electricity.
It is a non conductor of electricity.
It is non reactive & withstand high temperature.
In the electrolysis of acidified water the following electrodes are used..
Copper
Graphite
Platinum
In the electrolysis of copper sulphate ..
Copper a brownish pink metal is deposited at the cathode.
Copper a brownish pink metal is deposited at the anode.
The kind of salt is sodium argentocyanide.
Mixed salt
Normal salt
Complex salt
During electrorefining of copper.
The anode diminishes in mass.
The cathode diminishes in mass
Is an inert electrode
Graphite
Copper
Silver.
The following is the example of a strong electrolyte.
Lead nitrate
Calcium hydroxide.
Sodium carbonate is a ..
Weak electrolyte
Strong electrolyte
Non electrolyte.
