Redox Reactions and Electrochemistry — practice questions

237 curated practice questions from Redox Reactions and Electrochemistry (Chemistry JEE Main, NTA Exams) — 144 easy, 84 medium, 9 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.

• The molar conductivities _ NaOAc ^ o , and _ HCl ^ o at infinite dilution in water at 25ºC are 91.0 and 426.2S cm 2…
• The eq. wt. of K 2 Cr 2 O 7 as an oxidising agent in acid medium is:
• Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through aqueous solution of…
• In which of the following pairs, there is greatest difference in the oxidation number of the underlined elements?
• The EMF of the cell Mg | Mg 2+ (0.01 M)| |Sn 2+ (0.1M)| Sn at 298 K is (Given E ^ _ Mg ^ 2+/ Mg =-2.34 ~V , E _ Sn ^ 2+…
• Which of the following has been universally accepted as a reference electrode at all temperatures and has been assigned…
• The standard reduction potentials at 298 K are given against each of the following half cell reactions : I. E _ H ^ H _…
• Mono sodium salt of oxalic acid is titrated with NaOH solution. In the second titration it is titrated with KMnO 4…
• On electrolysing a solution of dilute H 2 SO 4 between platinum electrodes, the gas evolved at the anode is
• A current of 2 ampere was passed through solutions of CuSO 4 and AgNO 3 in series. 0.635 g of copper was deposited…
• The potential of the cell containing two hydrogen electrodes as represented below Pt, H 2 (g) | H + (10 –6 M) | |H +…
• For lead storage battery pick the correct statements. A. During charging of battery, PbSO 4 on anode is converted into…
• When one coulomb of charge is passed through an electrolytic solution for one sec, the mass deposited on the electrode…
• A current of 9.65 ampere is passed through the aqueous solution NaCl using suitable electrodes for 1000 s. The amount…
• The correct order of reactivity of K, Mg, Zn and Cu with water according to the electrochemical series is
• The reduction potential of hydrogen half-cell will be negative if
• Oxidation number of potassium in K 2 O, K 2 O 2 and KO 2 , respectively, is
• The standard electrode potential for the half-cell reactions are: array l Z n^ 2+ (a q)+2 e^ - Z n(5): E^ 3 =-0.76 ~V F…
• In which of the following reactions is there a change in the oxidation number of nitrogen atom?
• The oxidation number of Phosphorus in Mg 2 P 2 O 7 is :
• Volume V 1 mL of 0.1M K 2 Cr 2 O 7 is needed for complete oxidation of 0.678 g N 2 H 4 in acidic medium. The volume of…
• Chlorine undergoes disproportionation in alkaline medium as shown below: aCl 2 (g) + bOH – (aq) → cClO – (aq) + dCl –…
• Which one amongst the following are good oxidizing agents? A. Sm ^ 2+ B. Ce ^ 2+ C. Ce ^ 4+ D. T b^ 4+ Choose the most…
• array |l|l|l|l|c|l| Electrolyte: & KCl & KNO _ 3 & HCl & NaOAc & NaCl ^ ( S ~cm ^ 2 ~mol ^ -1 ): & 149.9 & 145 & 426.2…
• The ( E T )_ P of different types of half cells are as follows: array cccc A & B & C & D 1 10^ -4 & 2 10^ -4 & 0.1 10^…
• The concentration of a sample of acidified aqueous H 2 O 2 can be estimated by titrating against a standard solution of…
• Thiosulphate reacts differently with iodine and bromine in the reactions given below: 2 ~S _ 2 O _ 3 ^ 2- + I _ 2 ~S _…
• Resistance of 0.2 M solution of an electrolyte is 50Ω. The specific conductance of the solution is 1.3 S m –1 . If…
• When SO 2 is passed through an acidified solution of potassium dichromate the oxidation state of S changes from:
• Identify the factor from the following that does not affect electrolytic conductance of a solution. (Jee Main 2024)
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: In NH 4 NO…
• Equivalent weight of [ le ^ - MnO _ 4 ^ - neutral MnO _ 2 ] n =3 in acidic, neutral and basic media are in ratio of :
• An electrolysis of a oxytungsten complex ion using 1.10 A for 40 min produces 0.838 g of tungsten. What is the charge…
• The metals that are employed in the battery industries are A. Fe B. Mn C. Ni D. Cr E. Cd Choose the correct answer from…
• Which of the following behaves as both oxidising and reducing agents?
• The position of some metals in the electrochemical series in decreasing electropositive character is given as Mg > Al >…
• Which of the given reactions is not an example of disproportionation reaction?
• Which of the following has least tendency to liberate H 2 from mineral acids? (JEE Main 2022)
• Which of the following cannot function as an oxidising agent?
• The reaction 1 2 H _ 2 ( ~g )+ AgCl ( ~s ) H ^ + ( aq )+ Cl ^ - ( aq )+ Ag ( ~s ) occurs in the galvanic cell :
• If M 1 g of a metal A displaces M 2 g of another metal B from its salt solution and if their equivalent weight are E 1…
• Which of the following statements is not correct about rusting of iron? (Jee Main 2024)
• Fuel cell, using hydrogen and oxygen as fuels, A. has been used in spaceship B. has as efficiency of 40% to produce…
• The equivalent conductance of NaCl at concentration C and at infinite dilution are _ c and _ , respectively. The…
• Among the following halogens. F 2 , Cl 2 , Br 2 and I 2 Which can undergo disproportionation reactions? (Jee Main 2024)
• 30 g of NaOH is converted into NaCl and NaClO 3 by the action of Cl 2 . The Cl 2 is produced by reaction between MnO 2…
• Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R Assertion A…
• Given the data at 25 ° C, Ag + I - → AgI + e - ; E ° = 0.152V Ag → Ag + + e - ; E ° = - 0.800V What is the value of log…
• The standard electrode potentials (reduction) of Pt/Fe 3+ , Fe 2+ and Pt/Sn 4+ , Sn 2+ are + 0.77 V and 0.15 V…
• The moles of electrons required to deposit 1 gm equivalent aluminium (at. wt. = 27) from a solution of aluminium…
• For the redox reaction Zn(s) + Cu 2+ (0.1 M) → Zn 2+ (1 M) + Cu (s) taking place in a cell, E _ cell ^ o is 1.10V. E _…
• Which substance serves as reducing agents in the following reaction? 14H + + Cr 2 O 7 2– + 3Ni 2Cr 3+ + 7 H 2 O + 3Ni 2+
• What weight of NaHSO 3 is required to react with 100 mL of solution containing 0.33 g of NaIO 3 according to the…
• Which of the following reaction involves oxidation and reduction?
• A current of 8 ampere flows through molten NaCl for 25 minutes. The amount of metallic sodium that appears at the…
• In the conversion NH 2 OH NH _ 2 OH 4 e ^ - N 2 O, the equivalent weight of NH 2 OH will be :
• The E _ M ^ 3+ / M ^ 2+ values for Cr, Mn, Fe and Co are – 0.41, + 1.57, + 0.77 and + 1.97 V respectively. For which…
• A current of 9.65 amp. flowing for 10 minute deposits 3.0 g of a metal. The equivalent wt. of the metal is :
• Chlorine undergoes disproportionation in alkaline medium as shown below : a Cl 2( g ) + b OH – ( aq ) → c ClO – ( aq )…
• The eq. wt. of K 2 CrO 4 as an oxidising agent in acid medium is
• How many electrons are delivered at the cathode during electrolysis by a current of 1A in 60 seconds ?
• The emf of cell TI | (0.001 M ) TI ^ + | | (0.0 MM ) ( Cu ^ 2+ . | Cu is 0.83 V at 298 K. It could be increased by…
• Standard reduction electrode potentials of three metals A, B and C are + 0.5V, –3.0V and –1.2V respectively. The…
• Molar ionic conductivities of divalent cation and anion are 57 S cm 2 mol –1 and 73 S cm 2 mol –1 respectively. The…
• The weight of silver (eq. wt. = 108) displaced by the quantity of current which displaced 5600 mL of hydrogen at STP is…
• In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to
• KI reacts with H 2 SO 4 producing I 2 and H 2 S. The volume of 0.2 M H 2 SO 4 required to produce 0.1 mol of H 2 S is
• From the following E o values of half cells, what combination of two half cells would result in a cell with lowest…
• Electrode potential data are given below: array ll Fe ^ 2+ +2 e ^ - Fe (5): & E ^ a =-0.44 ~V Al ^ 3+ +3 e ^ - Al (5)…
• Adding powdered Pb and Fe to a solution containing 1.0 M is each of Pb 2+ and Fe 2+ ions would result into the…
• The equilibrium constant of the reaction: Cu (5)+2 Ag ^ + ( aq ) Cu ^ 2+ ( aq )+2 Ag (5) ; E o = 0.46 V at 298 K is:
• Given below are two statements: Statement I: Potassium hydrogen phthalate is a primary standard for Standardisation of…
• By the electrolysis of aqueous solution of CuSO 4 , the products obtained at both the electrodes are
• M is molecular weight of KMnO 4. . The equivalent weight of KMnO 4 when it is converted into K 2 MnO 4 is :
• Identify the incorrect statements regarding primary standard of titrimetric analysis. (A) It should be purely available…
• The compound that cannot act both as oxidising and reducing agent is
• In neutral or faintly alkaline medium, KMnO 4 being a powerful oxidant can oxidize, thiosulphate almost quantitatively…
• The molar conductivity for electrolytes A and B are plotted against C 1/2 as shown below. Electrolytes A and B…
• The hydrogen electrode is dipped in a solution of pH = 3 at 25°C. The potential of the cell would be (the value of…
• The standard reduction electrode potential values of the element A, B and C are + 0.68, –2.50, and –0.50 V…
• If E ^ Au ^ + / Au is 1.69 V and E ^ Au ^ 3+ / Au is 1.40 V, then E ^ Au ^ + / Au ^ 3+
• Consider the following reaction, x MnO 4 – + y C 2 O 4 2– + z H + → x Mn ^ 2+ +2 y CO _ 2 + z 2 H _ 2 O The values of x…
• In the reaction EW ( ~V _ 2 O _ 5 )= MW 6 the eq. wt. of V 2 O 5 is equal to its
• In the standardization of Na 2 S 2 O 3 using K 2 Cr 2 O 7 by iodometry, the equivalent mass K 2 Cr 2 O 7 is:
• Which out of the following is a correct equation to show change in molar conductivity with respect to concentration for…
• In the chemical reaction, K 2 Cr 2 O 7 + xH 2 SO 4 + ySO 2 K _ 2 Cr _ 2 O _ 7 + +6 XH _ 2 SO _ 4 + YSO _ 2 +3 ~K _ 2 SO…
• The mass of oxalic acid crystals (H 2 C 2 O 4 .2H 2 O) required to prepare 50 mL of a 0.2 N solution is :
• The conductivity of 0.1 N NaOH solution is 0.022 S cm –1 . When equal volume of 0.1 N HCl solution is added, the…
• For kinetic study of the reaction of iodide ion with H 2 O 2 at room temperature: (A) Always use freshly prepared…
• In the equation array c NO _ 1 ^ - + H _ 2 O NO _ + ^ - +2 H ^ + +2 e ^ - _ + ^ ++ m array n stands for
• When two half-cells of electrode potential of E 1 and E 2 are combined to form a cell of electrode potential E 3 , then…
• In the following reaction : M 4 the equivalent weight of As 2 S 3 (with molecular weight M) is:
• Which of the following reactions are disproportionation reactions? (A) Cu + Cu 2+ + Cu (B) 3MnO 4 2– + 4H + 2MnO 4 – +…
• The molar conductance at infinite dilution of AgNO 3 , AgCl and NaCl are 116.5, 121.6 and 110.3 respectively. The molar…
• The standard electrode potential for the reaction Ag + (aq) + e – Ag(s) Sn 2+ (aq) + 2e – Sn(s) at 25°C are 0.80 volt…
• Electrolysis can be used to determine atomic masses. A current of 0.550 A deposits 0.55 g of a certain metal in 100…
• What is the free energy change for the half reaction Li + + e – → Li? Given E _ Li ^ + / Li ^ =-3.0 ~V , F = 96500 C…
• BrO 3 – changes into Br 2 in an acidic medium of a unbalanced equation. How many electron should be present in the…
• During the electrolysis of fused NaCl, the reaction that occurs at the anode is :
• The standard emf of galvanic cell, involving 3 moles of electrons in its redox reaction is 0.59 V. The equilibrium…
• Match List-I with List-II. Choose the correct answer from the options given below: (Jee Main 2024)
• An ion is reduced to the element when it absorbs 6 × 10 20 electrons. The number of equivalents of the ion is :
• 21 O _ 3 ^ - +x I ^ - +12 H ^ + 6 I _ 2 +6 H _ 2 O What is the value of ? (Jee Main 2023)
• The cell Pt , H 2 (g)(1atm) | H + , pH = X, Normal calomel electrode has EMF of 0.67 V at 25 ° C . The oxidation…
• Resistance of 0.2M solution of an electrolyte is 50 . The specific conductance of the solution is 1.4S m –1 . The…
• Which of the following reactions is an example of a redox reaction?
• 108 g fairly concentrate solution of AgNO 3 is electrolyzed using 0.1 F of electricity. The weight of resulting…
• The compound that can work both as an oxidising as well as a reducing agent is :
• Standard electrodes potential are: array l Fe ^ 2+ / Fe [ E ^ a =-0.44 ~V ] Fe ^ 3+ / Fe ^ 2+ [ E ^ a =0.77 ~V ] array…
• If the pressure of hydrogen gas is increased from 1 atm. to 100 atm., keeping the hydrogen ion concentration constant…
• The emf of the cell Ti | Ti + (0.0001 M) | | Cu 2+ (0.01 M)|Cu is 0.83 V The emf of this cell will be increased by :
• The standard electrode potential of M^ + / M in aqueous solution does not depend on (Jee Main 2023)
• How many electrons are involved in the following redox reaction? Cr 2 O 7 2– + Fe 2+ + C 2 O 4 2– → Cr 3+ + Fe 3+ + CO 2
• In which of the following compounds, nitrogen has an oxidation state of – 1?
• The standard EMF of Daniell cell is 1.10 volt. The maximum electrical work obtained from the Daniell cell is
• The emf of Daniell cell is 1.1 volt. If the value of Faraday is 96500 coulombs per mole, the change in free energy in…
• One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode…
• The reduction electrode potential E, of 0.1 M solution of M + ions (E° RP = – 2.36 V) is :
• Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide. (Jee Main 2023)
• A conductivity cell with two electrodes (dark side) are half filled with infinitely diluted aqueous solution of a weak…
• What pressure (bar) of H 2 would be required to make emf of hydrogen electrode zero in pure water at 25°C? (Jee Main…
• In the balanced chemical reaction +5 I -1 O _ 3 ^ - + I ^ - + H ^ + H _ 2 O + I _ 2 a, b, c and d respectively…
• Oxidation state of nitrogen is correctly given for Compound Oxidation state
• E_ X^ - |A g X| A g ^ d will be maximum when AgX is:
• Given the data at 25ºC, Ag + I – → AgI + e – ; E o = 0.152 V Ag → Ag + + e – ; E o = – 0.800 V What is the value of log…
• Current efficiency is defined as the extent of desired electrochemical reaction divided by theoretical extent of…
• Which one of the following is an example of disproportionation reaction? (JEE Main 2022)
• The specific conductance of a salt of 0.01 M concentration is 1.061 × 10 –4 S cm − 1 molar conductance of the same…
• The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is A_ m 1 and that of 20…
• Which of the following represents the potential of silver wire dipped in to 0.1 M AgNO 3 solution at 25°C ?
• Equilibrium constant for the dissociation of Ag ( NH _ 3 )_ 2 ^ + into Ag + and NH 3 is 6 x 10 -8 . Calculate E o for…
• In the conversion of Br 2 to BrO _ 3 ^ - the oxidation number of Br changes from?
• The reaction; 1 2 H _ 2(g) + AgCl _ (g) H _ (e q) ^ + + Cl _ (e q) ^ - + Ag _ ( ) occurs in which of the following…
• Identify the process in which change in the oxidation state is five.
• Given array l Co ^ 3+ + e ^ - Co ^ 2+ ; E ^ =+1.81 ~V ~Pb ^ 4+ +2 e ^ - Pb ^ 2+ ; E ^ =+1.67 ~V Ce ^ 4+ + e ^ - Ce ^ 3+…
• Which of the following solutions of NaCl will have the highest specific conductance ?
• Consider the cell array c|c|c H _ 2 ( Pt ) & H _ 3 O ^ + ( aq ) 1 ~atm & pH =5.5 array | | array l Ag ^ + xM array | …
• What is the equivalent weight of NH 3 in the given reaction: 3CuO + 2NH 3 → 3Cu + N 2 + 3H 2 O
• Resistance of 0.2 M solution of an electrolyte is 50 Ω. The specific conductance of the solution is 1.4 S m -1 . The…
• Which one of the following is an example of disproportionation reaction?
• During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3…
• Gold is noble to react with nitric acid. However, gold does react with aqua regia because of the formation of complex…
• When Cu ^ 2+ ion is treated with KI, a white precipitate, X appears in solution. The solution is titrated with sodium…
• Co | Co 2+ (C 2 ) || Co 2+ (C 1 ) | Co for this cell, ∆G is negative if :
• For the electro chemical cell If E _ ( Ma ^ 2+ / M ) ^ =0.46 ~V and E _ ( Na ^ 2- ) ^ =0.34 ~V . Which of the following…
• The equation representing the process by which standard reduction potential of zinc can be defined is :
• If x is specific resistance (in S –1 cm) of the electrolyte solution and y is the molarity of the solution, then _ m…
• How many coulomb of electricity are consumed when 100 mA current is passed through a solution of AgNO 3 for 30 minute…
• The reaction 1 2 H 2 (g) + AgCl(s) ⇌ H + (aq) + Cl – (aq) + Ag(s) occurs in which of the given galvanic cell. (Jee Main…
• The correct order of reduction potentials of the following pairs is A. Cl 2 /Cl – B. I 2 /I – C. Ag + /Ag D. Na + /Na…
• The ratio of weights of hydrogen and magnesium deposited by the same amount of electricity from aqueous H 2 SO 4 and…
• A metal chloride contains 55.0% of chlorine by weight. 100 mL vapours of the metal chloride at STP weight 0.57 g. The…
• The standard electrode potential (M^ 3+ / M^ 2+ ) for V, Cr, Mn and Co are -0.26 ~V ,-0.4 lV ,+1.57 ~V and +1.97 ~V …
• In the balance reaction As _ 2 O _ 3 + l _ 2 As _ 2 O _ 5 + I ^ - the stoichiometric coefficient of l - will be:
• Given below are two statements: Statement I: For KI, molar conductivity increases steeply with dilution. Statement II…
• The emf of a Daniell cell at 298 K is E 1. Zn | array c ZnSO _ 4 10.01 M , array | | array ccc CuSO _ 4 & Cu 1.0 M , 0…
• If equal volumes of 0.1 M KMnO 4 and 0.1 M K 2 Cr 2 O 7 solutions are allowed to oxidise Fe 2+ to Fe 3+ in acidic…
• For the following cell with hydrogen electrodes at two different pressure p 1 and p 2 p _ 1 Pt 1 M ( H _ 2 ) | H ^ + (…
• The standard electromotive force of the cell Fe | Fe ^ 2+ ( aq ) | | Cd ^ 2+ ( aq ) | Cd If the temperature coefficient…
• How many moles of 1 5 ion will react with 1 mol of ferrous oxalate in acidic medium ?
• Which of the following options are correct for the reaction 2[Au(CN) 2 ] – ( aq ) + Zn ( s ) 2Au ( s ) + [Zn(CN) 4 ] 2…
• The quantity of silver deposited when one coulomb charge is passed through AgNO 3 solution: (Jee Main 2024)
• Al 2 O 3 is reduced by electrolysis at low potentials and high currents. If 4.5 × 10 4 A of current is passed through…
• Four successive members of the first row transition elements listed below with atomic numbers. Which one of them is…
• 4.5 g of aluminium (at. mass 27 amu ) is deposited at cathode from Al 3 + solution by a certain quantity of electric…
• The pK sp of Agl is 16.07. If the E o value for Ag + /Ag is 0.7991 V, find the E o for half-cell reaction, Agl (5)+ e ^…
• Consider the following standard reduction potentials: Ca ^ 2+ +2 e ^ - Ca ; E ^ 0 =-2.76 ~V Which of the following…
• 13.5 g of Al get deposited when electricity is passed through the solution of AlCl 3 . The number of faradays used are :
• Number of electrons involved in the electrodeposition of 63.5 g of Cu from a solution of CuSO 4 is :
• Which of the following statement is wrong about galvanic cell ?
• When chlorine (Cl 2 ) water in excess is added to a salt solution containing chloroform, chloroform layer turns pale…
• For a strong electrolyte, a plot of molar conductivity against (concentration) 1/2 is a straight line, with a negative…
• In the following balanced reaction, X MnO 4 – + Y C 2 O 4 2– + Z H + X Mn 2+ +2 Y CO 2 + values of X , Y and Z…
• The species given below that does not show disproportionation reaction is
• For the redox reaction, MnO 4 – + C 2 O 4 2– + H + 2 Mn _ O _ 4 ^ - C _ 2 O _ 4 ^ - 16 H Mn 2 + + CO 2 + H 2 O the…
• An aqueous solution containing 1 M each of Au 3+ , Cu 2+ , Ag + , Li + is being electrolysed by using inert electrodes…
• Match List-I with List-II. List-I List-II (A) Cd(s) + 2Ni(OH) 3 (s) → CdO(s) + 2Ni(OH) 2 (s) + H 2 O(l) (I) Primary…
• What mass of hydrazine (N 2 H 4 ) can be oxidized to N 2 by 103.1 millimoles of K 2 CrO 4 which is reduced to [ Cr ( OH…
• When molten lithium chloride (LiCl) is electrolyzed, lithium metal is formed at the cathode. If current efficiency is…
• E⁰ (reduction potential) for Fe +2 /Fe and Sn +2 /Sn are - 0.44 and -0.14 volts respectively. The standard emf for cell…
• In the reaction, 2 CuCl _ 2 +2 H _ 2 O +5 O _ 2 P + H _ 2 SO _ 4 +2 HCl ; P is:
• When dilute H 2 SO 4 is electrolysed between Pt electrodes, the gas liberated at the anode will be:
• K 2 CrO 4 oxidises KI in the presence of HCl to I 2 . The equivalent weight of the K 2 CrO 4 is
• Which of the given reactions is not an example of disproportionation reaction? (JEE Main 2022)
• The product, which is not obtained during the electrolysis of brine solution is (Jee Main 2023)
• Given below are two statements: Statement I: In redox titration, the indicators used are sensitive to change in pH of…
• A metal ion M 3 + loses 3 electrons, its oxidation number will be :
• Which of the following reactions are disproportionation reactions? (A) Cu + → Cu 2+ + Cu (B) 3 MnO _ 4 ^ 2- +4 H ^ + 2…
• The weight ratio of Al and Ag deposited using the same quantity of current is :
• 80 mL of KMnO 4 solution reacts with 3.4 g of Na 2 C 2 O 4 .2H 2 O in acidic medium. The molarity of the KMnO 4…
• The resistance of 0.1 M solution of a salt is found to be 2.5 × 10 3 ohms. The equivalent conductance of the solution…
• Calculate the standard free energy change for the reaction, 2 Ag + 2H + → H 2 + 2 Ag + E° for Ag + + e – → Ag is 0.80 V
• The species which does not undergo disproportionation reaction is
• Which reaction occur at cathode during electrolysis of fused lead bromide ?
• Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100Ω. The…
• Zn can not displace following ions from their aqueous solution :
• Match List-I with List-II. List-I (Reaction) List-II (Type of redox reaction) A N 2(g) +O 2(g) → 2NO (g) I…
• The equivalent conductance of monobasic acid at infinite dilution is 348 ohm -1 cm 2 eq -1 . If the resistivity of…
• In a cell that utilises the reaction Zn (s) + 2H + (aq) → Zn 2+ (aq) + H 2 (g) addition of H 2 SO 4 to cathode…
• The standard free energy change for the following reaction is – 210 kJ. What is the standard cell potential ? 2H 2 O 2…
• The equivalent mass of oxidising agent in the following reaction is SO 2 + 2H 2 S 4 e ^ - + SO _ +4 0 ~S 3S + 2H 2 O
• The oxidation number of sulphur in S 8 , S 2 F 2 , H 2 S respectively are :
• Electrolysis of dilute aqueous NaCl solution was carried out by passing 10 miliampere current. The time required to…
• When I - is oxidized by MnO _ 4 ^ - in alkaline medium, I - converts into:
• The equivalent conductances of two strong electrolytes at infinite dilution in H 2 O (where ions move freely through a…
• A metal having negative reduction potential when dipped in the solution of its own ions, has a tendency :
• For a cell given below : Ag Ag + || Cu 2+ Cu Ag + + e – Ag; Eº = x Cu 2+ + 2e – Cu; Eº = y Eº cell is
• Oxidation number of nitrogen in (NH 4 ) 2 SO 4 is
• Reduction potential of ions are given below: E ^ =1.19 ~V E ^ =1.65 ~V E ^ =1.74 ~V The correct order of their…
• The emf of the cell H 2 (1 atm) Pt | H + (a = x) | | H + (a = 1) | H 2 (1 atm) Pt at 25°C is 0.59 V. The pH of the…
• 0.05 moles of NaHCO 3 will react with how many equivalent of Mg(OH) 2 ?
• Cu + is not stable and undergoes disproportionation. E° for Cu + disproportionation is: (E° Cu 2+ /Cu + = + 0.153 V …
• E° for the half cell reactions are as, (a ) Zn → Zn 2+ + 2e – ; E° = + 0.76 V (b ) Fe → Fe 2+ + 2e – ; E° = + 0.41 V…
• Equivalent weight of H 3 PO 2 (molecular weight = M) when it disproportionates into PH 3 and H 3 PO 3 is
• The equivalent weight of MnSO 4 is half its molecular weight when it is converted to
• The quantity of electricity required to liberate 112 cm 3 of hydrogen at STP from acidified water is:
• E 0 for the reaction, Fe + Zn ^ 2+ Zn + Fe ^ 2+ , is -0.45 ~V . The given cell reaction is:
• The number of moles of KMnO 4 reduced by one mole of KI in alkaline medium is:
• In which of the compounds does manganese exhibit highest oxidation number?
• Given below are two statements: Statement I: S 8 solid undergoes disproportionation reaction under alkaline conditions…
• In acidic medium, K 2 Cr 2 O 7 shows oxidizing action as represented in the half reaction. C _ 2 O _ 7 ^ 2- + XH ^ + +…
• When the same electric current is passed through the solution of different elecrolytes in series the amounts of…
• In which of the following reactions, there is no change in valency?
• Colourless salt (A) + dil. H 2 SO 4 or CH 3 COOH + Kl blue colour with starch. (A) can be
• In which one of the following sets all species show disproportionation reaction?
• For the cell reaction, array c Cu ^ 2+ ( aq )+ Zn (5) Zn ^ 2+ ( aq )+ Cu (5) C _ 2 array of an electrochemical cell…
• The reaction at cathode in the cells commonly used in clocks involves. (Jee Main 2024)
• The cell, Zn | Zn 2+ (1M) || Cu 2+ (1M) | Cu (Eº cell = 1.10V) was allowed to be completely discharged at 298 K. The…
• Consider the following E o values : E _ Fe ^ 3+ / Fe ^ 2+ ^ 0 =+0.77 ~V E _ Sn ^ 2+ / Sn ^ o =-0.14 ~V Under standard…
• How can an electrochemical cell be converted into an electrolytic cell? (Jee Main 2024)
• Which of the following cannot function as an oxidizing agent? (Jee Main 2024)
• What will be the emf for the given cell ? Pt | H 2 (g, P 1 ) | H + (aq) || H 2 (g, P 2 ) | Pt|H + (aq)
• The operation and recharging of the lead-acid automobile battery involves two completely reversible half-reactions…
• What volume of 0.05 M K 2 Cr 2 O 7 in acidic medium is needed for complete oxidation of 200 mL of 0.6 M FeC 2 O 4…
• An indicator ‘X’ is used for studying the effect of variation in concentration of iodide on the rate of reaction of…
• Given E _ E ^ 3+ / E ^ 0 =-0.2 ~V , E _ E ^ 2+ / E ^ 0 =-0.2 ~V . The potential for the cell Cr | Cr 3+ (0.1M) || Fe 2+…
• When KMnO 4 acts as an oxidising agent and ultimately forms [MnO 4 ] 2– , MnO 2 , Mn 2 O 3 , Mn 2+ then the number of…

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