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