Electrochemistry — practice questions

130 curated practice questions from Electrochemistry (Chemistry JEE Advanced, NTA Exams) — 117 hard, 13 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.

• A 4.0 M aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution…
• A calomel electrode is represented as Hg, Hg 2 Cl 2 ,KCl. If in such a half cell
• The variation of _ m of acetic acid with concentration is correctly represented by
• At an anode in an electrolytic cell where electrolysis is taking place, which of the following processes must occur ?
• The resistance of 0.1 N solution of a salt is found to be 2.5 × 10 3 ohm. The equivalent conductance of the solution in…
• Standard reduction electrode potentials of three metals A, B and C are respectively – 0.5, – 3.0 V and – 1.2 V. The…
• Saturated solution of KNO 3 is used to make ‘salt-bridge’ because (2001)
• Standard potentials (Eº) for some half-reactions are given below : (I) Sn 4+ + 2 e ^ - → Sn 2+ ; Eº = + 0.15 V (II) 2Hg…
• The passage of current liberates H 2 at cathode and Cl 2 at anode. The solution is
• Plotting 1/ L m against c L m for aqueous solutions of a monobasic weak acid (H X ) resulted in a straight line with y…
• For the cell reaction, C ^ 2+ [ C _ 1( q ) ]+ Z _ ( s ) → Zn [ C _ 2 ( aq ) ] Cu _ ( s ) of an electrochemical cell…
• The standard potentials at 25ºC for the following half reactions are given against them Zn 2+ + 2e – → Zn, Eº = – 0.762…
• Given that array ll E _ Ni ^ 2+ / Ni ^ o =-0.25 ~V , & E _ Cu ^ 2+ / Cu ^ o =0.34 ~V , E _ Ag ^ + / Ag ^ o =0.80 ~V , &…
• A 5 ampere current is passed through a solution of zinc sulphate for 40 minutes. Find the amount of zinc deposited at…
• Redox reaction play a pivotal role in chemistry and biology. The values of standard redox potential (Eº) of two…
• The standard reduction potentials at 298K for the following half reactions are given against each Zn 2+ (aq) + 2e − →…
• For the following electrochemical cell at 298 K, Pt ( s ) |H 2( g ) , (1 bar)|H + ( aq ) , (1 M)|| M 4 + ( aq ) | M 2 +…
• Electrochemical series is a series of elements arranged in increasing order of their reduction potential. E _ H ^ + / H…
• Molar conductivity ( _ m ) of aqueous solution of sodium stearate, which behaves as a strong electrolyte is recorded at…
• During the electrolysis of aqueous sodium chloride, the cathodic reaction is
• A current of 2.0 A passed for 5 hours through a molten metal salt deposits 22.2 g of metal (At wt. = 177). The…
• Tollen’s reagent is used for the detection of aldehydes. When a solution of AgNO 3 is added to glucose with NH 4 OH…
• A 4.0 M aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution…
• The standard reduction potential values of three metallic cations, X , Y and Z are 0.52, –3.03 and –1.18 V…
• The half-cell reaction for the corrosion H + + O 2 + 2 e – → H 2 O ; E ° = 1.23 V, Fe 2+ + 2 e – → Fe ( s ) ; E ° = –…
• Eº for the cell, Zn | Zn 2+ (aq) || Cu 2+ (aq) | Cu is 1.10 V at 25ºC. The equilibrium constant for the cell reaction…
• The half cell reactions for rusting of iron are : Cathode: 2 H _ ( aq ) ^ + +2 e ^ - + 1 2 O _ 2 ( ~g ) H _ 2 O (1) ; E…
• In the cell, Zn | Zn 2+ || Cu 2+ | Cu, the negative terminal is
• Tollen’s reagent is used for the detection of aldehydes. When a solution of AgNO 3 is added to glucose with NH 4 OH…
• The quantity of electricity needed to deposit 127.08 g of copper is
• If 0.01 M solution of an electrolyte has a resistance of 40 ohms in a cell having a cell constant of 0.4 cm –1 then its…
• Silver is monovalent and has atomic mass of 108. Copper is divalent and has an atomic mass of 63.6 . The same electric…
• Consider the following cell reaction, 2 Fe ( ~s )+ O _ 2 ( ~g )+4 H ^ + ( aq ) 2 Fe ^ +2 ( aq )+2 H _ 2 O (l) E ^ =1.67…
• Specific conductance of 0.1 M sodium chloride solution is 1.06 × 10 –2 ohm –1 cm –1 . Its molar conductance in ohm –1…
• In the reaction : Cu (s) + 2Ag + (aq) → Cu 2+ (aq) + 2Ag (s) the reduction half cell reaction is
• For the reaction Zn(s) + Cu 2+ (aq) ⇌ Cu(s) + Zn 2+ (aq) Reaction Quotient = [ Zn ^ 2+ ] [ Cu ^ 2+ ] , variation of E…
• On passing a current of 1.0 ampere for 16 min and 5 sec through one litre solution of CuCl 2 , all copper of the…
• Which of the following material is not present in a dry cell ?
• Tollen’s reagent is used for the detection of aldehyde when a solution of AgNO 3 is added to glucose with NH 4 OH then…
• If 9 g of H 2 O is electrolysed completely with 50% current efficiency
• If the salt bridge is removed suddenly from a working cell, the voltage
• The standard reduction potential values of the three metallic cations X, Y and Z are 0.52, – 3.03 and – 1.18V…
• An unknown metal M displaces nickel from nickel (II) sulphate solution but does not displace manganese from manganese…
• Molar conductivity of a solution is 1.26 × 10 2 Ω –1 cm 2 mol –1 . Its molarity is 0.01 . Its specific conductivity…
• 1.08 g of pure silver was converted into silver nitrate and its solution was taken in a beaker. It was electrolysed…
• Which one of the following is not a function of a salt bridge ?
• The electrochemical cell shown below is a concentration cell. M|M 2+ (saturated solution of a sparingly soluble salt…
• What is the amount of chlorine evolved when 2 amperes of current is passed for 30 minutes in an aqueous solution of…
• When the cell reaction attains a state of equilibrium, the EMF of the cell is
• Tollen’s reagent is used for the detection of aldehydes. When a solution of AgNO 3 is added to glucose with NH 4 OH…
• The correct order of equivalent conductance at infinite dilution of LiCl, NaCl and KCl is (2001)
• Which one of the following reactions takes place at the anode when an aqueous solution of CuSO 4 is electrolysed using…
• Which of the following reaction occurs at the anode during the charging of lead storage battery ?
• Electrode potentials (Eº red ) of four elements, A, B, C, D are –1.36, –0.32, 0, –1.26V respectively. The decreasing…
• Which graph correctly correlates E cell as a function of concentrations for the cell Zn(s) + 2Ag + (aq) Zn 2+ (aq) +…
• The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The…
• Which of the following changes will increase the emf of cell ? Co(s) | CoCl 2 (M 1 ) || HCl (M 2 ) | H 2 (g) (p 1 )|…
• For a cell reaction involving a two-electron change, the standard e.m.f. of the cell is found to be 0.295V at 25ºC. The…
• The increase in the value of molar conductivity of acetic acid with dilution is due to
• Of the following, the metals that cannot be obtained by electrolysis of the aqueous solution of their salts are
• Assertion (A) : The correct order of equivalent conductance at infinite dilution is KCl > NaCl > LiCl Reason (R) : KCl…
• By passing 0.1 Faraday of electricity through fused sodium chloride, the amount of chlorine liberated is (atomic mass…
• During electrolysis of a concentrated aqueous solution of NaCl, what is the product at cathode?
• According to Kohlrausch law, the limiting value of molar conductivity of an electrolyte, A 2 B is
• A 4.0 M aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution…
• Conductance (unit Siemen’s S) is directly proportional to area of the vessel and the concentration of the solution in…
• Consider the following cell reaction 2Fe ( s ) + O 2( g ) + 4H + ( aq ) → 2Fe 2 + ( aq ) + 2H 2 O ( l ) ; E° = 1.67 V…
• Which one of the following represents a standard hydrogen electrode correctly ?
• If a strip of copper metal is placed in a solution of ferrous sulphate
• For the redox reaction : Zn (s) + Cu 2+ (0.1M) → Zn 2+ (1M) + Cu (s) taking place in a cell, E_ cell ^ o is 1.10 volt…
• The correct order of equivalent conductance at infinite dilution of LiCl, NaCl and KCl is
• To a mixture containing pieces of zinc, copper and silver, 1 M H 2 SO 4 was added. H 2 gas was found to be evolved…
• For the reaction Zn(s) + Cu 2+ (aq) ⇌ Cu(s) + Zn 2+ (aq) Reaction Quotient = [ Zn ^ 2+ ] [ Cu ^ 2+ ] , variation of E…
• The e.m.f. of a Daniell cell at 298K is E 1 Zn | array l ZnSO _ 4 (0.0 M ) array | | array l CuSO _ 4 (1.0 M ) array |…
• The electrochemical cell shown below is a concentration cell. M|M 2+ (saturated solution of a sparingly soluble salt…
• Assertion (A) : If standard reduction potential for the reaction Ag + + e – → Ag is 0.80 volts then for the reaction 3…
• The emf of the cell Ni/Ni 2+ (1.0M) || Au 3+ (1.0M)/Au is [Eº for Ni 2+ /Ni = – 0.25V ; Eº for Au 3+ /Au = 1.5 V]
• Some standard electrode potentials at 298 K are given below: (2021-Shift-2) Pb 2+ /Pb ⇒ –0.13 V Ni 2+ /Ni ⇒ –0.24 V Cd…
• Assertion (A) : Increasing the concentration increases the value of conductance. Reason (R) : Increasing the…
• The cell constant of a given cell is 0.47 cm –1 . The resistance of a solution placed in this cell is measured to be…
• Electrode potential data are given below : array ll Fe _ ( aq ) ^ +3 + e ^ - Fe _ ( aq ) ^ +2 ; & E ^ =+0.77 ~V Al _ (…
• For the following electrochemical cells at 298K, Pt ( s ) | H _ 2 ( ~g , 1 bar ) | H ^ + (1 M ) M ^ 4+ ( aq ), M ^ 2+ (…
• The standard reduction potentials Eº for the half reactions are as Zn → Zn 2+ + 2e – ; Eº = 0.76V Fe → Fe 2+ + 2e – …
• The value of specific conductance is equal to the conductance of the solution when
• Which one of the following reactions occurs at the anode when CuSO 4 solution is electrolysed using platinum electrodes?
• Assertion (A) : The voltage of mercury cell remains constant for longer period of time. Reason (R) : It is because net…
• For the reduction of NO _ 3 ^ - ion in an aqueous solution Eº is + 0.96V. Values of Eº for some metal ions are given…
• Which one of the following statements is incorrect regarding an electrochemical cell ?
• The standard reduction potential for Fe 2+ /Fe and Sn 2+ /Sn electrodes are – 0.44 and – 0.14 volt respectively. For…
• A gas X at 1 atm is bubbled through a solution containing a mixture of 1M Y – and 1 M Z – at 25ºC. If the reduction…
• 96500 C of electricity liberates from CuSO 4 solution
• The electrolysis of silver nitrate solution is carried out using silver electrodes. Which of the following reaction…
• I 2 and Br 2 are added to a solution containing 1 M each of I – and Br – ions. Which of the following reaction will…
• An aqueous solution of hydrazine (N 2 H 4 ) is electrochemically oxidized by O 2 , thereby releasing chemical energy in…
• Electrochemical series is a series of elements arranged in increasing order of their reduction potential. E _ H ^ + / H…
• The ionization constant of a weak electrolyte is 25 × 10 –6 while the equivalent conductance of its 0.01 M solution is…
• The standard reduction potentials of four elements are given below. Which of the following will be the most suitable…
• On passing electricity through an aqueous solution of copper sulphate using copper electrodes then
• When 9.65 coulombs of electricity is passed through a solution of silver nitrate (atomic mass of Ag = 108 g mol –1 )…
• Assertion (A) : We cannot add the electrode potentials in order to get the cell potential if number of moles of…
• The standard EMF for the cell reaction, Zn + Cu 2+ → Cu + Zn 2+ is 1.1 volt at 25ºC. The EMF for the cell reaction…
• Electrochemical series is a series of elements arranged in increasing order of their reduction potential. E _ H ^ + / H…
• In a simple electrochemical cell, which is in standard state, half cell reactions with their appropriate oxidation…
• The EMF of the cell, Zn | Zn 2+ (0.01 M) || Fe 2+ (0.001M) | Fe at 298 K is 0.2905 then the value of equilibrium…
• The number of coulombs required for the deposition of 107.870g of silver is
• Equivalent conductances of NaCl, HCl and CH 3 COONa at infinite dilution are 126.45, 426.16 and 91 ohm –1 cm 2…
• Molar ionic conductivities of a two-bivalent electrolytes x 2+ and y 2– are 57 and 73 respectively. The molar…
• The specific conductivity of N/10 KCl solution at 20ºC is 0.212 ohm –1 cm –1 and the resistance of the cell containing…
• Standard electrode potential data are useful for understanding the suitability of an oxidant in a redox titration. Some…
• The charge required to deposit 9 g of Al from Al 3+ solution is (At. wt. of Al = 27.0)
• In a solution of CuSO 4 how much time will be required to precipitate 2 g copper by 0.5 ampere current ?
• Electrolysis of dilute aqueous NaCl solution was carried out by passing 10 milli ampere current. The time required to…
• Redox reaction play a pivotal role in chemistry and biology. The values of standard redox potential (Eº) of two…
• For the following cell, (2017) Zn ( ~s ) | ZnSO _ 4 ( aq ) CuSO _ 4 ( aq ) | Cu ( ~s ) When the concentration of Zn ^…
• The electrochemical cell stops working after some time because
• Which of the following material is not present in mercury cell ?
• Cell reaction for the cell Zn | Zn 2+ (1.0 M) || Cd 2+ (1.0 M) | Cd is given by
• The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The…
• Zn | Zn 2+ (a = 0.1 M) || Fe 2+ (a = 0.01 M) | Fe. The emf of the above cell is 0.2905V. Equilibrium constant for the…
• The reduction potential of the two half cell reactions (occuring in an electrochemical cell) are PbSO 4 + 2e – → Pb +…
• For the following cell, Zn ( s ) | ZnSO 4( aq ) || CuSO 4( aq ) | Cu ( s ) when the concentration of Zn 2+ is 10 times…
• The increase in the molar conductivity of HCl with dilution is due to
• The equivalent conductance at infinite dilution of a weak acid such as HF
• Iron tanks are protected from rusting by connecting them with magnesium wire. Which of the following statements (s)…
• The conductance of 0.1 M HCl solution is greater than that of 0.1 M NaCl. This is because
• Chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules (approximately 6.023 ×…
• The limiting conductivity of NaCl, KCl and KBr are 126.5, 150.0 and 151.5 S cm 2 eq –1 , respectively. The limiting…
• The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The…
• The relationship between standard reduction potential of a cell and equilibrium constant is shown by
• For the cell :- 2Ag + Pt 2+ → 2Ag + + Pt Eº = 0.4 volt 2Ag + F 2 → 2Ag + + 2F – Eº = 2.07 volt If the potential for the…

← All Chemistry JEE Advanced chapters · All subjects