Chapter # 07 (Electrochemistry)

MCQ: Process in which substance gains electrons is called

  1. oxidation
  2. hydrogenation
  3. sublimation
  4. reduction

Answer 

MCQ: On industrial scale sodium metal is prepared by electrolysis of fused

  1. NaOH
  2. NaCl
  3. NaO
  4. NH3

Answer 

MCQ: Corrosion can be prevented by

  1. Alloying
  2. Tinning
  3. Galvanizing
  4. all of above

Answer 

MCQ: Electrolyte used for tin plating is

  1. sulphide ore
  2. stannous sulphate
  3. hydrogen sulphate
  4. sodium chloride

Answer 

MCQ: An electrolytic cell uses electrical energy to drive

  1. chemical reaction
  2. physical reaction
  3. no reaction
  4. none of above

Answer 

MCQ: Loss of hydrogen atoms by an element is called

  1. hydrogenation
  2. oxidation
  3. reduction
  4. sublimation

Answer 

MCQ: Elements whose oxidation number is increased are

  1. reduced
  2. hydrogenated
  3. oxidized
  4. none of above

Answer 

MCQ: Oxidation state of group IIIA metals is

  1. -3
  2. 3
  3. 0
  4. 1

Answer 

MCQ: In a dry cell anode is made up of

  1. zinc
  2. calcium
  3. sodium
  4. graphite

Answer 

MCQ: An electrochemical cell is also called

  1. battery cell
  2. galvanic cell
  3. cell
  4. chargeable cell

Answer 

MCQ: As compare to iron, aluminum has

  1. higher tendency to oxidize
  2. less tendency to oxidize
  3. equal tendency to oxidize
  4. none of above

Answer 

MCQ: Oxidation-reduction reaction involves

  1. transfer of neutrons
  2. transfer of protons
  3. transfer of electrons
  4. none of above

Answer 

MCQ: Lead and Zinc metals occur naturally as

  1. oxides
  2. sulphite ores
  3. carbon ores
  4. chloride ores

Answer 

MCQ: Conditions for good electroplating are

  1. high current density
  2. low temperature
  3. high concentration of metal in electrolyte
  4. all of above

Answer 

MCQ: Electrochemical cells convert

  1. mechanical energy in to electrical energy
  2. potential energy in to electrical energy
  3. kinetic energy in to electrical energy
  4. chemical energy in to electrical energy

Answer 

MCQ: Electrolyte among following is

  1. NaOH
  2. urea
  3. glucose
  4. benzene

Answer 

MCQ: Process used to deposit one metal over another metal is called

  1. electrolysis
  2. electroplating
  3. carbon plating
  4. none of above

Answer 

MCQ: A physical or chemical process that occurs by itself is called

  1. non spontaneous
  2. self occurring process
  3. spontaneous process
  4. thermodynamic process

Answer 

MCQ: Voltaic cells generates electricity by

  1. spontaneous redox reaction
  2. non spontaneous redox reaction
  3. sublimation reaction
  4. thermochemical reaction

Answer 

MCQ: Oxidation state of any free element is always

  1. 1
  2. 2
  3. 3
  4. 0

Answer 

MCQ: Galvanic cells are also named as

  1. electrolytic cells
  2. battery cells
  3. Daniel cells
  4. john cells

Answer 

MCQ: When zinc is plated on steel, anode is made up of

  1. steel
  2. oxygen
  3. zinc
  4. carbon

Answer 

MCQ: Electrolysis of brine produces

  1. chlorine gas
  2. hydrogen gas
  3. sodium hydroxide
  4. all of above

Answer 

MCQ: A reactant containing element that is oxidized is called

  1. reducing agent
  2. oxidizing agent
  3. hydrogen
  4. sublime

Answer 

MCQ: By losing one or two electrons atoms of metal are

  1. oxidized
  2. reduced
  3. hydrogenated
  4. sublimated

Answer 

MCQ: In chromium plating few drops of Sulphuric acid are added to electrolyte in order to prevent

  1. oxidation
  2. reduction
  3. hydrolysis
  4. sublimation

Answer 

MCQ: Electrodes used in production of sodium metal are

  1. iron cathode and graphite anode
  2. sodium cathode and carbon anode
  3. aluminum cathode and fluoride anode
  4. none of above

Answer 

MCQ: In thermal power stations carbon atoms undergo oxidation to form

  1. CO2
  2. CO
  3. H2O
  4. O2

Answer 

MCQ: Electrolytes convert electricity in

  1. solid state
  2. liquid state
  3. gaseous state
  4. plasma state

Answer 

MCQ: A concentrated aqueous solution of sodium chloride is called

  1. aqueous solution
  2. salt solution
  3. brine
  4. lemonade

Answer 

MCQ: Rusting of iron occurs due to

  1. reduction
  2. hydrogenation
  3. oxidation
  4. sublimation

Answer 

MCQ: Element reduced in following reaction 2Ca + O2 2CaO is

  1. Ca
  2. O2
  3. CaO
  4. none of above

Answer