Electrochemistry — practice questions
89 curated practice questions from Electrochemistry (Chemistry Class 12, CBSE) — 87 easy, 2 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.
- A standard hydrogen electrode has a zero potential because
- How much metal will be deposited when a current of 12 ampere with 75% efficiency is passed through the cell for 3 h?…
- The charge required for reducing 1 mole of MnO 4 – to Mn 2+ is
- Limiting molar conductivity for some ions is given below (in S cm 2 mol –1 ) : Na + - 50.1, Cl – - 76. 3, H + - 349.6…
- Same amount of electric current is passed through the solutions of AgNO 3 and HCl. If 1.08 g of silver is obtained from…
- Match the column I with column II and mark the appropriate choice. Column I Column II (A) E red. (i) W = I × Z × t (B)…
- Electrode potential for Mg electrode varies according to the equation, E_ Mg ^ 2+ Mg ^ - =E_ Mg ^ 2+ Mg ^ u - 0.059 2 1…
- Electrolysis of an aqueous solution of AgNO 3 with silver electrodes produces (i) at cathode while (ii) ions are…
- An acidic solution of Cu 2+ containing 0.4 g of Cu 2+ ions is electrolysed until all the copper is deposited. What is…
- Label the given diagram showing lead storage battery:
- What will be the reduction potential for the following half-cell reaction at 298 K? (Given : [Ag + ] = 0.1 M and E °…
- For a cell reaction: M n + ( aq ) + ne – → M ( s ) , the Nernst equation for electrode potential at any concentration…
- Match the column I with column II and mark the appropriate choice. Column I Column II (A) Fe in solid state (i)…
- Molar conductivity of 0.025 mol L –1 methanoic acid is 46.1 S cm 2 mol –1 , the degree of dissociation and dissociation…
- The number of moles of KMnO 4 that are needed to react completely with one mole of ferrous oxalate in acidic solution is
- The reaction which is taking place in nickel - cadmium battery can be represented by which of the following equation?
- Which of the following reactions does not take place during rusting?
- The equivalent conductivity of N /10 solution of acetic acid at 25°C is 14.3 ohm –1 cm 2 equiv –1 . What will be the…
- How long would it take to deposit 50 g of Al from an electrolytic cell containing Al 2 O 3 using a current of 105…
- Electrode potential data of few cells is given below. Based on the data, arrange the ions in increasing order of their…
- Which of the following is the correct cell representation for the given cell reaction? Zn + H 2 SO 4 → ZnSO 4 + H 2
- The overall reaction of a hydrogen-oxygen fuel cell is
- Given below are few reactions with some expressions. Mark the expression which is not correctly matched.
- How much time is required to deposit 1 × 10 –3 cm thick layer of silver (density is 1.05 g cm –3 ) on a surface of area…
- The specific conductance of a saturated solution of AgCl at 25°C is 1.821 × 10 –5 mho cm –1 . What is the solubility of…
- In a cell reaction, Cu ( s ) + 2Ag + ( aq ) → Cu 2 + ( aq ) + 2Ag ( s ) E ° cell = +0.46 V. If the concentration of Cu…
- D r G ° for the cell with the cell reaction: Zn ( s ) + Ag 2 O ( s ) + H 2 O ( l ) → Zn 2+ ( aq ) + 2Ag ( s ) + 2OH – (…
- Units of the properties measured are given below. Which of the properties has not been matched correctly?
- How many moles of Pt may be deposited on the cathode when 0.80 F of electricity is passed through a 1.0 M solution of…
- A weak monobasic acid is 5% dissociated in 0.01 mol dm –3 solution. Limiting molar conductivity of acid at infinite…
- How many coulombs of electricity is required to reduce 1 mole of Cr 2 O 7 2– in acidic medium?
- Molar conductivity of 0.15 M solution of KCl at 298 K, if its conductivity is 0.0152 S cm –1 will be
- An electric charge of 5 Faradays is passed through three electrolytes AgNO 3 , CuSO 4 and FeCl 3 solution. The grams of…
- E ° cell for the reaction, 2H 2 O → H 3 O + + OH – at 25°C is – 0.8277 V. The equilibrium constant for the reaction is
- Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of…
- The equivalent conductance of Ba 2+ and Cl – are respectively 127 and 76 ohm –1 cm 2 eq –1 at infinite dilution. What…
- Molar conductivity of NH_4OH can be calculated by Kohlrausch's law as: ^ _ NH_4OH = 1 2 ^ _ Ba(OH)_2 + ^ _ NH_4Cl - 1 2…
- A galvanic cell has electrical potential of 1.1 V. If an opposing potential of 1.1 V is applied to this cell, what will…
- Answer the following question on the basis of the given paragraph. The variation in L m with concentration for a strong…
- What will be standard cell potential of galvanic cell with the following reaction? 2Cr ( s ) + 3Cd 2+ ( aq ) → 2Cr 3+ (…
- The amount of chlorine evolved by passing 2 A of current in an aqueous solution of NaCl for 30 minutes is
- In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice…
- When an aqueous solution of AgNO 3 is electrolysed between platinum electrodes, the substances liberated at anode and…
- Which of the following is not an application of electrochemical series?
- When water is added to an aqueous solution of an electrolyte, what is the change in specific conductivity of the…
- Mark the correct Nernst equations for the given cell. Fe ( s ) | Fe 2+ (0.001 M) | | H + (1 M) | H 2( g ) (1 bar) | Pt…
- Choose the option with correct words to fill in the blanks. According to preferential discharge theory, out of number…
- How much electricity in terms of faraday is required to produce 100 g of Ca from molten CaCl 2 ?
- Match the column I with column II and mark the appropriate choice. Column I Column II (A) Λ m (i) l / A (B) G * (ii) ρ…
- What will be the molar conductivity of Al 3+ ions at infinite dilution if molar conductivity of Al 2 (SO 4 ) 3 is 858 S…
- For the cell reaction : 2Cu + ( aq ) → Cu ( s ) + Cu 2 + ( aq ) , the standard cell potential is 0.36 V. The…
- Mark the correct choice of electrolytes represented in the graph.
- A current of 1.40 ampere is passed through 500 mL of 0.180 M solution of zinc sulphate for 200 seconds. What will be…
- Which of the following is the correct order in which metals displace each other from the salt solution of their salts.
- Standard electrode potentials of few half-cell reactions are given below: MnO 4 – + 8H + + 5 e – → Mn 2+ + 4H 2 O; E °…
- The half-cell reactions with their appropriate standard reduction potentials are (i) Pb 2+ + 2 e – → Pb ( E ° = –0.13…
- Given below are the standard electrode potentials of few half-cells. The correct order of these metals in increasing…
- If 54 g of silver is deposited during an electrolysis reaction, how much aluminium will be deposited by the same amount…
- Which of the following is the cell reaction that occurs when the following half-cells are combined? I 2 + 2 e – → 2I –…
- Given below are two figures of Daniell cell ( X ) and ( Y ). Study the figures and mark the incorrect statement from…
- Following reactions are taking place in a Galvanic cell, Zn → Zn 2+ + 2 e – ; Ag + + e – → Ag Which of the given…
- E ° value of Ni 2+ / Ni is –0.25 V and Ag + /Ag is +0.80 V. If a cell is made by taking the two electrodes what is the…
- Fill in the blanks in the given reactions.
- E ° values for the half cell reactions are given below: Cu 2+ + e – → Cu + ; E ° = 0.15 V Cu 2+ + 2 e – → Cu ; E ° =…
- E ° values of three metals are listed below. Zn 2 + ( aq ) + 2 e – → Zn ( s ) ; E ° = –0.76 V Fe 2 + ( aq ) + 2 e – →…
- The correct Nernst equation for the given cell Pt ( s ) | Br 2( l ) | Br – (M) | | H + (M) | H 2( g ) (1 bar) | Pt ( s…
- In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice…
- For the galvanic cell, Cu | Cu 2+ | | Ag + | Ag. Which of the following observations is not correct?
- The specific conductivity of N /10 KCl solution at 20° C is 0.0212 ohm –1 cm –1 and the resistance of the cell…
- During electrolysis of a solution of AgNO 3 , 9650 coulombs of charge is passed through the solution. What will be the…
- Specific conductance of 0.1 M NaCl solution is 1.01 × 10 –2 ohm –1 cm –1 . Its molar conductance in ohm –1 cm 2 mol –1…
- Answer the following question on the basis of the given data. Given below are E ° values of a few cells: Which of the…
- In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice…
- Which of the following reactions are disproportionation reactions?
- What would be the equivalent conductivity of a cell in which 0.5 N salt solution offers a resistance of 40 ohm whose…
- The standard reduction potential for Cu 2+ / Cu is +0.34 V. What will be the reduction potential at pH = 14? [Given : K…
- What will be the emf of the following concentration cell at 25°C? Ag ( s ) | AgNO 3 (0.01 M) | | AgNO 3 (0.05 M) | Ag (…
- Fill in the blanks with appropriate words. The electrolytic solution is always neutral because the total charge on…
- The standard reduction potential for the half-cell reaction, Cl 2 + 2 e – → 2Cl – will be (Pt 2+ + 2Cl – → Pt + Cl 2 …
- Match the column I with column II and mark the appropriate choice. Column I Column II (A) Kohlrausch s law (i) Λ ° eq =…
- Δ G ° for the reaction, Cu 2+ + Fe → Fe 2+ + Cu is (Given : E ° Cu 2+ | Cu = +0.34 V, E ° Fe 2+ | Fe = –0.44 V)
- A cell is set up as shown in the figure. It is observed that EMF of the cell comes out to be 2.36 V. Which of the given…
- Equilibrium constant K is related to E ° cell and not E cell because
- Answer the following question on the basis of the given paragraph. The variation in L m with concentration for a strong…
- Match the column I with column II and mark the appropriate choice. Column I Column II (A) Pb ( s ) + SO 4 2 – ( aq ) →…
- Match the column I with column II and mark the appropriate choice. Column I Column II (A) Electrochemical equivalent…
- An electric current is passed through silver nitrate solution using silver electrodes. 15.28 g of silver was found to…
- During the electrolysis of dilute sulphuric acid, the following process is possible at anode.
- In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice…