Electrochemistry — practice questions
87 curated practice questions from Electrochemistry (Chemistry NEET, NTA Exams) — 27 hard, 16 medium, 44 easy. Every question includes the final answer free; step-by-step worked solutions with a free account.
- The reaction; 1 2 H _ 2 ( ~g )+ AgCl (5) H ^ + ( aq )+ Cl ^ - ( aq )+ Ag (5) occurs in the galvanic cell. What will be…
- A solution of Ni(NO 3 ) 2 is electrolysed between platinum electrodes using 0.1 Faraday electricity. How many mole of…
- A current of 1.6 A is passed through CuSO 4 solution. The number of Cu ++ ions liberated per minute are
- Which colourless gas evolves when NH 4 Cl reacts with zinc in a dry cell battery?
- Standard free energies of formation ( in kJ/mol) at 298 K are - 237.2, - 394.4 and - 8.2 for H 2 O( l ), CO 2 (g) and…
- The standard reduction potentials at 298 K for the following half cells are given: array ll Z n^ 2+ (a q)+2 e^ - Z n(5)…
- Aluminium oxide may be electrolysed at 1000°C to furnish aluminium metal (Atomic mass = 27 u; 1 F = 96500 C/mol). The…
- Which of the following statement is incorrect for a galvanic cell:
- The Gibbs energy for the decomposition of Al 2 O 3 at 500 °C is as follows: 2 3 A l_ 2 O_ 3 4 3 A l+O_ 2 , C_ r =+966…
- The standard electrode potential (E°) values of Al 3+ /Al, Ag + /Ag, K + /K and Cr 3+ /Cr are -1.66 V, 0.80 V, -2.93 V…
- The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge…
- The cell, Zn | Zn ^ 2+ (1 M ) | | Cu ^ 2+ (1 M ) | Cu [E_ t e ^ a =1.10 ~V ], was allowed to be completely discharged…
- Electrolysis of dil. H 2 SO 4 liberates gases at anode and cathode:
- For the following with hydrogen electrodes at two different pressures p 1 and p 2 : _ 1 Pt (H_ 2 ) | H _ 1 M ^ + ( aq )…
- The equivalent conductances at infinite dilution for AC, BD and CD are 91, 426.2 and 126.5 ohm -1 cm 2 g equi -1…
- The hydrogen electrode is dipped in a solution of pH 3 at 25°C. The potential would be (the value of 2.303 RT/F is…
- The conductivity of 0.01 mol per dm 3 aqueous acetic acid at 300 K is 19.5 × 10 -5 ohm -1 cm -1 and the limiting molar…
- Ionic mobility of Ag + is: ( _ Ag ^ + =5 10^ -1 hm ^ -1 ~cm ^ 2 eq ^ -1 ):
- 9.65 C of electric current is passed, through fused anhydrous magnesium chloride. The magnesium metal thus obtained is…
- Given, E _ Fr ^ Ia ++ Fr =-0.036 ~V , E _ Fr ^ Ia ^ 2+ / Fr =-0.439 ~V The value of standard electrode potential for…
- An increase in equivalent conductance of a strong electrolyte with dilution, is mainly due to:
- A galvanic cell is constructed using the redox reaction: 1 2 H_ 2 (g)+A g C l(5) H^ + (a q)+ Cl ^ - (a q)+ Ag (5) it is…
- From the following data ZH ^ + ( aq )+ 1 2 O _ 2 ( ~g )+2 e ^ - H _ 2 O ( o ) E ^ a =1.23 ~V ; F e^ 2+ (a q)+2 e^ - F…
- What is the effect of dilution on the equivalent conductance of strong electrolyte?
- The molar conductivity of a 0.5 mol/dm 3 solution of AgNO 3 with electrolytic conductivity of 5.76 10^ -3 5 cm -1 at…
- Electrolyte KCl KNO 3 HCl NaOAc NaCl Λ ∞ (S cm2 mol -1 ) 149.9 145.0 426.2 91.0 126.5 Calculate A _ HOAt ^ using…
- The correct order of equivalent conductivity at infinite dilution of LiCl, NaCl and KCl is:
- A hypothetical electrochemical cell is shown below A |A^ + (x M) | |B^ + (y M) | B The emf measured is + 0.20V. The…
- The electric charge, for electrode deposition of one gram equivalent of a substance is:
- The standard electrode potential E^ and its temperature coefficient ( d E^ e d T ) for a cell are 2V and -5 10^ -4 VK ^…
- For the reduction of silver ions with copper metal, the standard cell potential was found to be + 0.46 V at 25 ° C. The…
- The number of Faradays (F) required to produce 20 g of calcium from molten CaCl 2 (Atomic mass of Ca = 40 g mol -1 ) is
- For the cell reaction 2 F e^ 3+ (a q)+21^ - (a q) 2 F e^ 2+ (a q)+1_ 2 (a q) E_ t e l l ^ =0.24 ~V at 298 K. The…
- The standard e.m.f. for the cell reaction, 2 Cu ^ + _ [a q] Cu _ [m] + Cu _ [a q] ^ 2+ is +0.36 V at 298 K. The…
- The logarithm of the equilibrium constant, log K of the cell reaction of the cell Zn (5) | Zn ^ +2 ( aq ) | | Cu ^ 2+ (…
- Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1M is 100Ω. The…
- The specific conductivity of 0.1N KCl solution is 0.0129 ohm -1 cm -1 . The resistance of the solution in the cell is…
- During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a…
- Saturated solution of KNO 3 is used to make salt-bridge because:
- Which of the following solution when electrolyzed will give off hydrogen at platinum electrode?
- A smuggler could not carry gold by depositing iron on gold surface because:
- The quantity of electricity needed to electrolyse completely 1M solution of CuSO 4 , Bi 2 (SO 4 ) 3 , AlCl 3 and AgNO 3…
- On the basis of the information available from the reaction 4 3 Al + O _ 2 2 3 Al _ 2 O _ 3 ; L =-827 ~kJ ~mol ^ -1 of…
- Given; E _ Cr ^ 3+ / Cr ^ - =-0.72 ~V , E _ Ft ^ 2+ / Fr =-0.42 ~V . The potential for the cell Cr | Cr ^ 3+ (0.1 M ) |…
- Which one of the following condition will increase the voltage of the cell represented by the equation? Cu(s) + 2Ag +…
- The equivalent conductances of two strong electrolytes at infinite dilution in H 2 O (where ions move freely through a…
- Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- Consider the statements S 1 and S 2 S 1 : Conductivity always increases with decreases in the concentration of…
- Given that array l E _ B _ 2^ / H _ 2 O ^ =1.23 ~V ; E _ I _ 2 O _ 8 ^ 2- / AO _ 4 ^ 2- ^ =2.05 ~V E _ Br _ 2^ / Ar ^ …
- In a typical fuel cell, the reactants (R) and product (P) are:
- Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- The standard reduction potential values of three metallic cations X, Y and Z are 0.52, - 3.03 and - 1.18 V…
- The standard Gibbs energy for the given cell reaction in kJ mol -1 at 298 K is: Zn (5)+ Cu ^ 2+ ( aq ) Zn ^ 2+ ( aq )+…
- A solution containing one mole per litre of each Cu(NO 3 ) 2 , AgNO 3 , Hg 2 (NO 3 ) 2 and Mg(NO 3 ) 2 is being…
- For a cell reaction involving a two-electron change, the standard emf of the cell is found to be 0.295 V at 25°C. The…
- For a cell given below array ll . Ag |_ - | Ag ^ + | | Cu ^ 2+ | Cu & & Ag ^ + + e ^ - Ag & E ^ = x Cu ^ 2+ +2 e ^ - Cu…
- For the electrode H + (aq) l H 2 (g), if pH is decreased by one unit at 25 ° C, then the cell potential:
- On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be
- When during electrolysis of a solution of AgNO 3 , 9650 C of charge pass through the electroplating bath, the mass 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…
- _ m ^ for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S cm 2 mol -1 , respectively. If the conductivity of 0.001 M HA…
- The correct value of cell potential in volt for the reaction that occurs when the following two half cells are…
- The standard reduction potentials of Cu 2 + /Cu and Cu 2 + /Cu + are 0.337 V and 0.153 V respectively. The standard…
- The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of PbSO 4…
- Same amount of electric current is passed through solutions of AgNO 3 and HCl. If 1.08 g of silver is obtained in the…
- The limiting molar conductivities Λ° for NaCl, KBr and KCl are 126, 152 and 150 S cm 2 mol -1 respectively. The Λ° for…
- The conductivity of centimolar solution of KCl at 25°C is 0.0210 ohm -1 cm -1 and the resistance of the cell containing…
- A specific quantity of charge liberates 0.635 gm of copper. The volume of hydrogen liberated at N.T.P. is
- The weight of silver (at wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O 2 at STP will…
- A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is…
- Which of the following statements is correct for an electrolytic cell?
- Aluminium displaces hydrogen from acids, but copper does not. A Galvanic cell prepared by combining Cu/Cu 2 + and Al/Al…
- When a quantity of electricity is passed through CuSO 4 solution, 0.16 g of copper gets deposited. If the same quantity…
- On passing 3 Faraday of electricity through the three electrolytic cells, connected in series containing Ag + , Ca 2 +…
- In the electrochemical reaction, ZFe ^ 3+ + Zn Zn ^ 2+ +2 Fe ^ 2+ increasing the concentration of Fe 2 + :
- Given standard reduction potential values: (i) Cu ^ 2+ +2 e ^ - Cu _ 4 E ^ a =0.337 ~V (ii) Cu ^ 2+ + e ^ - Cu ^ + , E…
- The reduction potential of hydrogen half cell will be negative if ZH ^ + + Ze ^ - H _ 2 ( ~g ) :
- What is the weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O 2 at…
- The standard reduction potentials of Zn and Ag in water at 298 K are, Zn ^ +2 +2 e ^ - Zn _ i E ^ a =-0.76 ~V and Ag ^…
- If the E_ tell ^ a for a given reaction has a negative value, which of the following gives the correct relationship for…
- In electrolysis of NaCl, when Pt electrode is taken then, H 2 is liberated at cathode, while with Hg cathode it forms…
- If the standard electrode potential for a cell is 2V at 300 K, the equilibrium constant (K) for the reaction Zn ( ~s )+…
- On the basis of the following E ° values, the strongest oxidizing agent is: array c . [ Fe ( CN )_ k ]^ 4- [ Fe ( CN )_…
- The molar ionic conductivities of NH 4 + and OH - at infinite dilution are 72 and 198 ohm -1 cm 2 respectively. The…
- The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25 ° C. The…
- Molar conductance of an electrolyte increases with dilution according to the equation: A_ m =A_ m ^ -A c Which of the…
- The equilibrium constant for the reaction, 5 r(5)+M g^ 2+ (a q) 5 r^ 2+ (a q)+M g(5) is 2.69 × 10 12 at 25 ° C. The E°…