An electrochemical cell is also called
1. battery cell
2. galvanic cell
3.cell
4. chargeable cell
In a dry cell the anode is made up of
1. zinc
2.calcium
3.sodium
4.graphite
In thermal power stations carbon atoms undergo oxidation to form
1. CO2
2.CO
3.H2O
4.O2
The oxidation state of any free element is always
1.1
2.2
3.3
4.0
A concentrated aqueous solution of sodium chloride is called
1.aqueous solution
2.salt solution
3.brine
4.lemonade
A physical or chemical process that occurs by itself is called
1. non spontaneous
2. self occurring process
3. spontaneous process
4. thermodynamic process
A reactant containing the element that is oxidized is called
1. reducing agent
2. oxidizing agent
3. hydrogen
4. sublime
An electrolytic cell uses electrical energy to drive
1. chemical reaction
2.physical reaction
3. no reaction
4. biochemical reaction
As compare to iron aluminum has
1. higher tendency to oxidize
2. less tendency to oxidize
3. equal tendency to oxidize
4. all of above
By losing one or two electrons the atoms of metal are
1. oxidized
2. reduced
3.hydrogenated
4.sublimated
Conditions for good electroplating are
1. high current density
2. low temperature
3. high concentration of metal in electrolyte
4. all of above
Corrosion can be prevented by
1. Alloying
2.Tinning
3.Galvanizing
4. all of above
Electrochemical cells convert which of these into electrical energy?
1. mechanical energy
2. potential energy
3. kinetic energy
4. chemical energy
Electrolysis of brine produces
1. chlorine gas
2. hydrogen gas
3. sodium hydroxide
4. all of above
Electrolytes convert electricity in
1. solid state
2.liquid state
3.gaseous state
4.plasma state
Galvanic cells are also named as
1. electrolytic cells
2. battery cells
3. Daniel cells
4. John cells
In chromium plating few drops of Sulphuric acid are added to the electrolyte to prevent
1. oxidation
2.reduction
3.hydrolysis
4.sublimation
Lead and Zinc metals occur naturally as
1. oxides
2. sulphite ores
3. carbon ores
4. chloride ores
Loss of hydrogen atoms by an element is called
1. hydrogenation
2. oxidation
3. reduction
4. sublimation
On an industrial scale sodium metal is prepared by electrolysis of fused
1. NaOH
2. NaCl
3.NaO
4.NH3
Oxidation-reduction reaction involves
1. transfer of neutrons
2. transfer of protons
3. transfer of electrons
4. all of above
Rusting of iron occurs due to
1. reduction
2.hydrogenation
3.oxidation
4. sublimation
The electrodes used in the production of sodium metal are
1. iron cathode and graphite anode
2. sodium cathode and carbon anode
3. aluminum cathode and fluoride anode
4. aluminum cathode and sodium anode
The electrolyte among the following is
1. NaOH
2. urea
3. glucose
4. benzene
The electrolyte used for tin plating is
1. sulphide ore
2.stannous sulphate
3.hydrogen sulphate
4. sodium chloride
The element reduced in following reaction 2Ca + O2 2CaO is
1. Ca
2.O2
3. CaO
4. none of above
The elements whose oxidation number is increased are
1. reduced
2. hydrogenated
3. oxidized
4.oxygenated
The oxidation state of group IIIA metals is
1. -3
2. 3
3.0
4.1
The process in which substance gains electrons is called
1. oxidation
2. hydrogenation
3. sublimation
4. reduction
The process used to deposit one metal over another metal is called
1. electrolysis
2. electroplating
3.carbon plating
4. none of above
Voltaic cells generate electricity by
1. spontaneous redox reaction
2. non spontaneous redox reaction
3. sublimation reaction
4. thermochemical reaction
When zinc is plated on steel the anode is made up of
1. steel
2.oxygen
3.zinc
4. carbon