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JEE Main

Electrochemistry

Chemistry

Previous Years Questions

Numerical

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Resistance of a conductivity cell (cell constant $$129 \mathrm{~m}^{-1}$$) filled with $$74.5 \,\mathrm{ppm}$$ solution ...
JEE Main 2022 (Online) 29th July Morning Shift
The amount of charge in $$\mathrm{F}$$ (Faraday) required to obtain one mole of iron from $$\mathrm{Fe}_{3} \mathrm{O}_{...
JEE Main 2022 (Online) 26th July Morning Shift
The spin-only magnetic moment value of M3+ ion (in gaseous state) from the pairs Cr3+ / Cr2+, Mn3+ / Mn2+, Fe3+ / Fe2+ a...
JEE Main 2022 (Online) 25th July Evening Shift
The cell potential for $$\mathrm{Zn}\left|\mathrm{Zn}^{2+}(\mathrm{aq})\right|\left|\mathrm{Sn}^{x+}\right| \mathrm{Sn}$...
JEE Main 2022 (Online) 25th July Morning Shift
The enthalpy of combustion of propane, graphite and dihydrogen at $$298 \mathrm{~K}$$ are $$-2220.0 \mathrm{~kJ} \mathrm...
JEE Main 2022 (Online) 25th July Morning Shift
The cell potential for the following cell Pt |H2(g)|H+ (aq)|| Cu2+ (0.01 M)|Cu(s) is 0.576 V at 298 K. The pH of the sol...
JEE Main 2022 (Online) 24th June Morning Shift
The resistance of a conductivity cell containing 0.01 M KCl solution at 298 K is 1750 $$\Omega$$. If the conductivity of...
JEE Main 2022 (Online) 24th June Evening Shift
In a cell, the following reactions take place $$\matrix{ {F{e^{2 + }} \to F{e^{3 + }} + {e^ - }} & {E_{F{e^{3 + }}/F{...
JEE Main 2022 (Online) 25th June Morning Shift
A solution of Fe2(SO4)3 is electrolyzed for 'x' min with a current of 1.5 A to deposit 0.3482 g of Fe. The value of x is...
JEE Main 2022 (Online) 25th June Evening Shift
Cu(s) + Sn2+ (0.001M) $$\to$$ Cu2+ (0.01M) + Sn(s) The Gibbs free energy change for the above reaction at 298 K is x $$\...
JEE Main 2022 (Online) 26th June Evening Shift
The limiting molar conductivities of NaI, NaNO3 and AgNO3 are 12.7, 12.0 and 13.3 mS m2 mol$$-$$1, respectively (all at ...
JEE Main 2022 (Online) 27th June Morning Shift
For the reaction taking place in the cell : Pt (s)| H2 (g)|H+(aq) || Ag+(aq) |Ag (s) E$$_{cell}^o$$ = + 0.5332 V. The va...
JEE Main 2022 (Online) 27th June Evening Shift
The quantity of electricity in Faraday needed to reduce 1 mol of Cr2O$$_7^{2 - }$$ to Cr3+ is ____________....
JEE Main 2022 (Online) 28th June Morning Shift
For the given reactions Sn2+ + 2e$$-$$ $$\to$$ Sn Sn4+ + 4e$$-$$ $$\to$$ Sn the electrode potentials are ; $$E_{S{n^{2 +...
JEE Main 2022 (Online) 28th June Evening Shift
The cell potential for the given cell at 298 K Pt| H2 (g, 1 bar) | H+ (aq) || Cu2+ (aq) | Cu(s) is 0.31 V. The pH of the...
JEE Main 2022 (Online) 29th June Evening Shift
A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen...
JEE Main 2022 (Online) 29th June Morning Shift
If the conductivity of mercury at 0$$^\circ$$C is 1.07 $$\times$$ 106 S m$$-$$1 and the resistance of a cell containing ...
JEE Main 2021 (Online) 1st September Evening Shift
Consider the following cell reaction :$$C{d_{(s)}} + H{g_2}S{O_{4(s)}} + {9 \over 5}{H_2}{O_{(l)}}$$ $$\rightleftharpoon...
JEE Main 2021 (Online) 31st August Morning Shift
The resistance of a conductivity cell with cell constant 1.14 cm$$-$$1, containing 0.001 M KCl at 298 K is 1500 $$\Omega...
JEE Main 2021 (Online) 27th August Evening Shift
For the galvanic cell,Zn(s) + Cu2+ (0.02 M) $$\to$$ Zn2+ (0.04 M) + Cu(s),Ecell = ______________ $$\times$$ 10$$-$$2 V. ...
JEE Main 2021 (Online) 26th August Evening Shift
For the cellCu(s) | Cu2+ (aq) (0.1 M) || Ag+(aq) (0.01 M) | Ag(s)the cell potential E1 = 0.3095 VFor the cellCu(s) | Cu2...
JEE Main 2021 (Online) 27th July Evening Shift
The conductivity of a weak acid HA of concentration 0.001 mol L$$-$$1 is 2.0 $$\times$$ 10$$-$$5 S cm$$-$$1. If $$\Lambd...
JEE Main 2021 (Online) 27th July Morning Shift
Consider the cell at 25$$^\circ$$CZn | Zn2+ (aq), (1M) || Fe3+ (aq), Fe2+ (aq) | Pt(s)The fraction of total iron present...
JEE Main 2021 (Online) 25th July Morning Shift
Assume a cell with the following reaction$$C{u_{(s)}} + 2A{g^ + }(1 \times {10^{ - 3}}M) \to C{u^{2 + }}(0.250M) + 2A{g_...
JEE Main 2021 (Online) 22th July Evening Shift
Potassium chlorate is prepared by electrolysis of KCl in basic solution as shown by following equation.6OH$$-$$ + Cl$$-$...
JEE Main 2021 (Online) 20th July Evening Shift
The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and ...
JEE Main 2021 (Online) 18th March Evening Shift
For the reaction 2Fe3+(aq) + 2I$$-$$(aq) $$ \to $$ 2Fe2+(aq) + I2(s) the magnitude of the standard molar free energy cha...
JEE Main 2021 (Online) 18th March Morning Shift
A KCl solution of conductivity 0.14 S m$$-$$1 shows a resistance of 4.19$$\Omega$$ in a conductivity cell. If the same c...
JEE Main 2021 (Online) 17th March Evening Shift
A 5.0 m mol dm$$-$$3 aqueous solution of KCl has a conductance of 0.55 mS when measured in a cell of cell constant 1.3 c...
JEE Main 2021 (Online) 16th March Evening Shift
Emf of the following cell at 298K in V is x $$\times$$ 10$$-$$2.Zn|Zn2+(0.1 M)||Ag+ (0.01 M)|AgThe value of x is _______...
JEE Main 2021 (Online) 26th February Evening Shift
Consider the following reaction$$MnO_4^ - + 8{H^ + } + 5{e^ - } \to M{n^{ + 2}} + 4{H_2}O,{E^o} = 1.51V$$.The quantity ...
JEE Main 2021 (Online) 26th February Morning Shift
Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is _________. (Integer ...
JEE Main 2021 (Online) 25th February Evening Shift
Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization enegy of...
JEE Main 2021 (Online) 25th February Evening Shift
Copper reduces NO$$_3^ - $$ into NO and NO2 depending upon the concentration of HNO3 in solution. (Assuming fixed [Cu2+]...
JEE Main 2021 (Online) 25th February Evening Shift
1 molal aqueous solution of an electrolyte A2B3 is 60% ionised. The boiling point of the solution at 1 atm is _________ ...
JEE Main 2021 (Online) 25th February Morning Slot
The magnitude of the change in oxidising power of the $$MnO_4^ - /M{n^{2 + }}$$ couple is x $$\times$$ 10$$-$$4 V, if th...
JEE Main 2021 (Online) 24th February Evening Slot
Potassium chlorate is prepared by the electrolysis of KCl in basic solution 6OH- + Cl- $$ \to $$ ClO3- + 3H2O + 6e- If o...
JEE Main 2020 (Online) 6th September Morning Slot
The volume, in mL, of 0.02 M K2Cr2O7 solution required to react with 0.288 g of ferrous oxalate in acidic medium is ____...
JEE Main 2020 (Online) 5th September Evening Slot
An oxidation-reduction reaction in which 3 electrons are transferred has a $$\Delta $$Gº of 17.37 kJ mol–1 at 25 oC. The...
JEE Main 2020 (Online) 5th September Morning Slot
An acidic solution of dichromate is electrolyzed for 8 minutes using 2A current. As per the following equation Cr2O72- ...
JEE Main 2020 (Online) 3rd September Evening Slot
The photoelectric current from Na (Work function, w0 = 2.3 eV) is stopped by the output voltage of the cell Pt(s) | H2 ...
JEE Main 2020 (Online) 3rd September Morning Slot
The Gibbs change (in J) for the given reaction at [Cu2+] = [Sn2+] = 1 M and 298K is : Cu(s) + Sn2+(aq.) $$ \to $$ Cu2+(...
JEE Main 2020 (Online) 2nd September Morning Slot
108 g of silver (molar mass 108 g mol–1) is deposited at cathode from AgNO3(aq) solution by a certain quantity of electr...
JEE Main 2020 (Online) 9th January Morning Slot
For an electrochemical cell Sn(s) | Sn2+ (aq,1M)||Pb2+ (aq,1M)|Pb(s) the ratio $${{\left[ {S{n^{2 + }}} \right]} \over {...
JEE Main 2020 (Online) 8th January Evening Slot
What would be the electrode potential for the given half cell reaction at pH = 5? ______. 2H2O $$ \to $$ O2 + 4H$$ \oplu...
JEE Main 2020 (Online) 8th January Morning Slot
For the reaction : A($$l$$) $$ \to $$ 2B(g) $$\Delta U = 2.1\,kcal,\,\Delta S = 20\,cal\,{K^{ - 1}}$$ at 300 K Hence $$\...
JEE Main 2020 (Online) 7th January Morning Slot

MCQ (Single Correct Answer)

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Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style...
JEE Main 2022 (Online) 28th July Morning Shift
Given below are two statements : Statement I : For KI, molar conductivity increases steeply with dilution Statement II :...
JEE Main 2022 (Online) 27th July Evening Shift
The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is $${\Lambda _{m1}}$$ and tha...
JEE Main 2022 (Online) 25th July Evening Shift
In which of the following half cells, electrochemical reaction is pH dependent?
JEE Main 2022 (Online) 30th June Morning Shift
The correct order of reduction potentials of the following pairs is A. Cl2/Cl$$-$$ B. I2/I$$-$$ C. Ag+/Ag D. Na+/Na E. L...
JEE Main 2022 (Online) 25th June Evening Shift
The $${\left( {{{\partial E} \over {\partial T}}} \right)_P}$$ of different types of half cells are as follows: .tg {b...
JEE Main 2022 (Online) 26th June Morning Shift
In 3d series, the metal having the highest M2+/M standard electrode potential is
JEE Main 2022 (Online) 27th June Evening Shift
Match List - I with List - II List - I(Parmeter) List - II(Unit) (a) Cell constant...
JEE Main 2021 (Online) 31st August Evening Shift
Given below are two statements :Statement I : The limiting molar conductivity of KCl (strong electrolyte) is higher comp...
JEE Main 2021 (Online) 26th August Morning Shift
Given below are two statements :Statement I : The Eo value for Ce4+ / Ce3+ is + 1.74 V.Statement II : Ce is more stable ...
JEE Main 2021 (Online) 16th March Morning Shift
The electrode potential of M2+/M of 3d-series elements shows positive value for :
JEE Main 2021 (Online) 24th February Morning Slot
For the given cell : Cu(s) | Cu2+(C1M) || Cu2+(C2M) | Cu(s) change in Gibbs energy ($$\Delta $$G) is negative, if...
JEE Main 2020 (Online) 6th September Evening Slot
The variation of molar conductivity with concentration of an electrolyte (X) in aqueous solution is shown in the given f...
JEE Main 2020 (Online) 5th September Evening Slot
250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1 M AgNO3 and 0.1 M AuCl. The solution w...
JEE Main 2020 (Online) 4th September Evening Slot
$$E_{C{u^{2 + }}|Cu}^0$$ = +0.34 V $$E_{Z{n^{2 + }}|Zn}^0$$ = -0.76 V Identify the incorrect statement from the option ...
JEE Main 2020 (Online) 4th September Morning Slot
The equation that is incorrect is :
JEE Main 2020 (Online) 7th January Evening Slot
Given that the standard potentials (Eo) of Cu2+/Cu and Cu+/Cu are 0.34 V and 0.522 V respectively, the Eo of Cu2+/Cu+ ...
JEE Main 2020 (Online) 7th January Morning Slot
The decreasing order of electrical conductivity of the following aqueous solutions is : 0.1 M Formic acid (A), 0.1 M Ace...
JEE Main 2019 (Online) 12th April Evening Slot
Given CO3+ + e– $$ \to $$ CO2+ ; Eo = + 1.81 V Pb4+ + 2e– $$ \to $$ Pb2+ ; Eo = + 1.67 V Ce4+ + e– $$ \to $$ Ce3+ ; E...
JEE Main 2019 (Online) 12th April Morning Slot
A solution of Ni(NO3)2 is electrolysed between platinum electrodes using 0.1 Faraday electricity. How many mole of Ni wi...
JEE Main 2019 (Online) 9th April Evening Slot
The standard Gibbs energy for the given cell reaction in kJ mol–1 at 298 K is : Zn(s) + Cu2+ (aq) $$ \to $$ Zn2+ (aq) + ...
JEE Main 2019 (Online) 9th April Morning Slot
Calculate the standard cell potential in (V) of the cell in which following reaction takes place : Fe2+(aq) + Ag+(aq) $$...
JEE Main 2019 (Online) 8th April Evening Slot
Given that $${E^\Theta }_{{O_2}/{H_2}O} = 1.23\,V$$ ; $${E^\Theta }_{{S_2}O_8^{2 - }/SO_4^{2 - }} = 2.05\,V$$ $${E^\Thet...
JEE Main 2019 (Online) 8th April Morning Slot
Given (i)  C (graphite) + O2(g) $$ \to $$ CO2(g); $$\Delta $$rH$$^\Theta $$ = x kJ mol$$-$$1 (ii)  ...
JEE Main 2019 (Online) 12th January Evening Slot
$$ \wedge _m^ \circ $$ for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S cm2 mol–1, respectively. If the conductivity ...
JEE Main 2019 (Online) 12th January Evening Slot
The standard electrode potential $${E^o }$$ and its temperature coefficient $$\left( {{{d{E^o }} \over {dT}}} \right)$$ ...
JEE Main 2019 (Online) 12th January Morning Slot
For the cell Zn(s) |Zn2+ (aq)| |Mx+ (aq)| M(s), different half cells and their standard electrode potentials are given b...
JEE Main 2019 (Online) 11th January Morning Slot
In the cell Pt$$\left| {\left( s \right)} \right|$$H2(g, 1 bar)$$\left| {HCl\left( {aq} \right)} \right|$$AgCl$$\left|...
JEE Main 2019 (Online) 10th January Evening Slot
Consider the following reduction processes : Zn2+ + 2e– $$ \to $$ Zn(s) ; Eo = – 0.76 V Ca2+ + 2e– $$ \to $$ Ca(s); Eo =...
JEE Main 2019 (Online) 10th January Morning Slot
The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of PbSO4 electrolyz...
JEE Main 2019 (Online) 9th January Morning Slot
When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p-aminophenol produce...
JEE Main 2018 (Online) 16th April Morning Slot
When an electric currents passed through acidified water, 112 mL of hydrogen gas at N.T.P. was collected at the cathode ...
JEE Main 2018 (Online) 15th April Morning Slot
How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released c...
JEE Main 2018 (Offline)
To find the standard potential of M3+/M electrode,the following cell is constituted : Pt/M/M3+(0.001 mol L−1 )/Ag+(0.01 ...
JEE Main 2017 (Online) 9th April Morning Slot
Consider the following standard electrode potentials (Eo in volts) in aqueous solution : .tg {border-collapse:collapse...
JEE Main 2017 (Online) 8th April Morning Slot
What is the standard reduction potential (Eo) for Fe3+ $$ \to $$ Fe ? Given that : Fe2+ + 2e$$-$$ $$ \to $$ Fe; $$E_{F{...
JEE Main 2017 (Online) 8th April Morning Slot
Given $$E_{C{l_2}/C{l^ - }}^o$$ = 1.36 V, $$E_{C{r^{3 + }}/Cr}^o$$ = - 0.74 V $$E_{C{r_2}{O_7}^{2 - }/C{r^{3 + }}}^o$$ =...
JEE Main 2017 (Offline)
Identify the correct statement :
JEE Main 2016 (Online) 10th April Morning Slot
Oxidation of succinate ion produces ethylene and carbon dioxide gases. On passing 0.2 Faraday electricity through an aqu...
JEE Main 2016 (Online) 10th April Morning Slot
What will occur if a block of copper metal is dropped into a beaker containing a solution of 1M ZnSO4 ?
JEE Main 2016 (Online) 9th April Morning Slot
Galvanization is applying a coating of:
JEE Main 2016 (Offline)
Two Faraday of electricity is passed through a solution of CuSO4. The mass of copper deposited at the cathode is: (at. m...
JEE Main 2015 (Offline)
The equivalent conductance of NaCl at concentration C and at infinite dilution are $${\lambda _C}$$ and $${\lambda _\in...
JEE Main 2014 (Offline)
Given below are the half-cell reactions: Mn2+ + 2e- $$\to$$ Mn; Eo = -1.18 V 2(Mn3+ + e- $$\to$$ Mn2+); Eo = +1.51 V The...
JEE Main 2014 (Offline)
Resistance of 0.2 M solution of an electrolyte is 50 $$\Omega$$. The specific conductance of the solution is 1.4 S m-1. ...
JEE Main 2014 (Offline)
Given $$E_{C{r^{2 + }}/Cr}^o$$ = -0.74 V; $$E_{MnO_4^ - /M{n^{2 + }}}^o$$ = 1.51 V $$E_{C{r_2}O_7^{2 - }/C{r^{3 + }}}^o$...
JEE Main 2013 (Offline)
The standard reduction potentials for Zn2+/ Zn, Ni2+/ Ni, and Fe2+/ Fe are –0.76, –0.23 and –0.44 V respectively. The re...
AIEEE 2012
The reduction potential of hydrogen half cell will be negative if :
AIEEE 2011
The Gibbs energy for the decomposition of Al2O3 at 500oC is as follows : $${2 \over 3}A{l_2}{O_3}$$ $$\to$$ $${4 \over 3...
AIEEE 2010
The correct order of $$E_{{M^{2 + }}/M}^o$$ values with negative sign for the four successive elements Cr, Mn, Fe and Co...
AIEEE 2010
In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is CH3OH(l) + 3/2O2 $$\to$$...
AIEEE 2009
Given : $$E_{F{e^{3 + }}/Fe}^o$$ = -0.036V; $$E_{F{e^{2 + }}/Fe}^o$$ = -0.439 V The value of standard electrode potenti...
AIEEE 2009
Given $$E_{C{r^{3 + }}/Cr}^o$$ = -0.72 V; $$E_{Fe^{2+}/Fe}^o$$ = -0.42V, The potential for the cell Cr | Cr3+ (0.1M) || ...
AIEEE 2008
The cell, Zn | Zn2+ (1M) || Cu2+ (1M) | Cu($$E_{cell}^o$$ = 1.10V) was allowed to be completely discharged at 298 K. Th...
AIEEE 2007
The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a sol...
AIEEE 2007
Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100$$\Omega $$. The...
AIEEE 2006
The molar conductivities $$ \wedge _{NaOAc}^o$$ and $$ \wedge _{HCl}^o$$ and at infinite dilution in water at 25oC are ...
AIEEE 2006
.tg {border-collapse:collapse;border-spacing:0;} .tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px...
AIEEE 2005
The highest electrical conductivity of the following aqueous solutions is of
AIEEE 2005
Aluminium oxide may be electrolysed at 1000oC to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulo...
AIEEE 2005
For a spontaneous reaction the ∆G , equilibrium constant (K) and $$E_{cell}^o$$ will be respectively
AIEEE 2005
The $$E_{{M^{3 + }}/{M^{2 + }}}^o$$ values for Cr, Mn, Fe and Co are – 0.41, +1.57, + 0.77 and +1.97 V respectively. Fo...
AIEEE 2004
In a cell that utilises the reaction Zn(s) + 2H+ (aq) $$\to$$ Zn2+(aq) + H2(g) addition of H2SO4 to cathode compartment,...
AIEEE 2004
The limiting molar conductivities Λ° for NaCl, KBr and KCl are 126, 152 and 150 S cm2 mol-1 respectively. The Λ° for NaB...
AIEEE 2004
The standard e.m.f of a cell, involving one electron change is found to be 0.591 V at 25oC. The equilibrium constant of ...
AIEEE 2004
Consider the following Eo values $$E_{F{e^{3 + }}/F{e^{2 + }}}^o$$ = 0.77 V; $$E_{S{n^{2 + }}/S{n}}^o$$ = -0.14 V Under...
AIEEE 2004
In a hydrogen – oxygen fuel cell, combustion of hydrogen occurs to
AIEEE 2004
Several blocks of magnesium are fixed to the bottom of a ship to
AIEEE 2003
For the redox reaction Zn(s) + Cu2+(0.1 M) $$\to$$ Zn2+(1M) + Cu(s) taking place in a cell, $$E_{cell}^o$$ is 1.10 volt...
AIEEE 2003
When during electrolysis of a solution of AgNO3 9650 coulombs of charge pass through the electroplating bath, the mass o...
AIEEE 2003
For a cell reaction involving a two-electron change, the standard e.m.f. of the cell is found to be 0.295 V at 25oC. The...
AIEEE 2003
Standard reduction electrode potentials of three metals A,B&C are respectively +0.5 V, -3.0 V & -1.2 V. The redu...
AIEEE 2003
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are
AIEEE 2002
Which of the following reaction is possible at anode?
AIEEE 2002
EMF of a cell in terms of reduction potential of its left and right electrodes is
AIEEE 2002
For the following cell with hydrogen electrodes at two different pressure p1 and p2. What will be the emf for the given ...
AIEEE 2002
Conductivity (unit Siemen’s S) is directly proportional to area of the vessel and the concentration of the solution in i...
AIEEE 2002

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