Bihar Board Class 12 (Science) Electrochemistry — practice questions
106 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice Bihar Board Class 12 (Science) Electrochemistry in the app →In a GALVANIC cell, the ANODE is:The standard electrode potential of the Standard Hydrogen Electrode (SHE) is defined as:The Daniell cell (Zn-Cu) has E°cell = +1.10 V. Calculate ΔG° (F = 96500 C/mol):The Nernst equation at 25°C for a cell reaction is:Faraday's first law of electrolysis states that the mass deposited is:The byproduct of a hydrogen-oxygen fuel cell (used in space + electric cars) is:What is the cell potential of the Daniell cell at unit ion concentrations?A device that turns the energy of a spontaneous redox reaction into electricity is called what?Which type of cell uses electrical energy to drive a non-spontaneous reaction?If the external voltage on a Daniell cell exceeds 1.1 V, what happens to the cell reaction?In a Daniell cell, no current flows when the opposing external voltage equals what?In the Daniell cell, which electrode acts as the site of oxidation?In a galvanic cell, the electrode where reduction occurs is called what?What is the sign of the anode in a galvanic cell relative to its solution?The potential difference between an electrode and its electrolyte at equilibrium is called what?Electrons in an external circuit flow from which electrode to which?By convention, how is the emf of a galvanic cell written in terms of electrode potentials?In cell notation, which side is conventionally used for the anode?In cell notation, what does a double vertical line represent?Which is the cell representation for the reaction Cu + 2Ag+ giving Cu2+ + 2Ag?What is the potential assigned to the standard hydrogen electrode?What metal is the electrode in a standard hydrogen electrode coated with platinum black?At the standard hydrogen electrode, what is the hydrogen gas pressure?What is the standard electrode potential of the Cu2+/Cu couple?A Zn-Cu cell has Zn2+ at 1 M and Cu2+ at 0.01 M. What is its emf at 298 K, with Eo = 1.1 V?As a Daniell cell discharges, what happens to its voltage?What is the emf of a cell at chemical equilibrium?At 298 K, which relation links Eo of a two-electron cell to its equilibrium constant?Using Eo = 1.1 V and n = 2 for the Daniell cell at 298 K, log Kc is about what?Which equation connects Gibbs energy change to cell emf?Which quantity of a cell reaction is intensive?If a cell reaction is doubled, what happens to its emf and DrG?What is DrG of the Daniell cell reaction, using Eo = 1.1 V and F = 96500 C/mol?Resistance of a conductor is directly proportional to its length and inversely proportional to what?What is the SI unit of resistivity?How many ohm centimetres equal one ohm metre?Conductance is the reciprocal of what quantity?How many S/m make up 1 S/cm of conductivity?Which material in this list is an insulator?Which material is classed as a semiconductor?Which polymer becomes conducting after exposure to iodine vapour?What happens to metallic conductance as temperature rises?Metallic conductance is carried by the movement of what?Pure water has a small conductivity because it contains what?Conductivity of pure water is about 3.5 x 10^-5 of which unit?Conductance of electricity by ions in solution is called what?Which bridge circuit is used to measure the resistance of an electrolytic solution?Conductivity of a solution always does what on dilution?What happens to molar conductivity when an electrolyte solution is diluted?Molar conductivity is related to conductivity kappa and volume V of one mole by which relation?A solution of 50 mol/m3 has kappa = 1.148 S/m. What is its molar conductivity in S m2 mol-1?How many S cm2 mol-1 equal 1 S m2 mol-1?Limiting molar conductivity refers to molar conductivity when concentration approaches what?For strong electrolytes, Lm varies with c^1/2 according to which equation?Which is a 2-2 type electrolyte?Limiting molar conductivity of a weak electrolyte is found using what?Kohlrausch law states that limiting molar conductivity of an electrolyte equals what?Given Lo for NaCl 126.4, HCl 425.9 and NaAc 91.0, what is Lo for HAc in S cm2 mol-1?In electrolysis, product amounts at an electrode are proportional to what, per Faraday's first law?By Faraday's second law, equal charge liberates substances in proportion to their what?In what years did Faraday publish his two laws of electrolysis?Quantity of electricity Q passed by constant current I for time t is given by what?How much charge is carried by one mole of electrons, approximately?How many faradays are needed to deposit one mole of aluminium from Al3+?A current of 50,000 A is how many faradays of charge per second, approximately?CuSO4 is electrolysed with 1.5 A for 10 min. What mass of copper is deposited (Cu = 63)?What mass of silver is deposited when 9650 C passes through AgNO3 solution (Ag = 108)?How is aluminium produced industrially?Sodium metal is obtained industrially by electrolysis of what?During refining of copper, impure copper is made which electrode?What are the products of electrolysis of aqueous NaCl?What term is given to the extra potential needed for a kinetically slow electrode process?In aqueous NaCl electrolysis, what gas forms at the anode owing to overpotential of oxygen?An inert electrode such as platinum does what in electrolysis?Which is an example of a primary battery?What is the approximate potential of a dry (Leclanche) cell?In a dry cell, MnO2 is reduced from which oxidation state to which?Which metal forms the dry cell container that acts as anode?Mercury cells suit which type of device?Why does a mercury cell keep a constant potential during use?What is the anode of the lead storage battery?When a lead storage battery discharges, what solid forms at both electrodes?What happens to the lead storage battery reaction during charging?A secondary cell differs from a primary cell because it can be what?Fuel cells convert the energy of fuels like hydrogen directly into what?Which fuel cell powered the Apollo space programme?What catalysts are put in hydrogen-oxygen fuel cell electrodes?What useful by-product of the Apollo fuel cell was used by astronauts?The rusting of iron needs the presence of what?During rusting of iron, the spot that acts as the anode undergoes what?What is the Eo of the Fe2+/Fe couple in the corrosion reaction?What is the overall Eo of the cell for rusting of iron?What is the chemical form of rust?Which metal is mentioned for a sacrificial electrode to protect iron?Which gas combustion gives only water, making it central to the Hydrogen Economy?Which statement about the sign of electrodes is right for a galvanic cell?In an electrolytic cell, what is the sign of the anode?What is the main job of a salt bridge between two half-cells?Which cell produces current by irreversible reactions and cannot be recharged?Which of these is a rechargeable secondary cell used to start a car engine?How does a fuel cell differ from a battery in its reactants?At the cathode of a hydrogen-oxygen fuel cell, hydrogen ions, electrons and oxygen react to form what?A fuel cell gives only about 0.7 V. How is higher voltage obtained?As a galvanic cell discharges and reactant concentrations fall, what happens to the cell potential?Half-cell potentials are measured relative to which reference electrode, assigned 0 volts?Which industrial process is carried out in an electrolytic cell using direct current?