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Electrochemistry

Chemistry

Previous Years Questions

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The molar conductivity of 0.007 M acetic acid is 20 S cm2 mol$$-$$1. What is the dissociation constant of acetic acid? C...
NEET 2021
The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol$$-$$1 respect...
NEET 2021
The number of Faradays(F) required to produce 20 g of calcium from molten CaCl2 (Atomic mass of Ca = 40 g mol-1) is :...
NEET 2020 Phase 1
On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be :
NEET 2020 Phase 1
For the cell reaction 2Fe3+(aq) + 2I– (aq) $$ \to $$ 2Fe2+(aq) + I2(aq) $${E_{cell}^\Theta }$$ = 0.24 V at 298 K. The st...
NEET 2019
For a cell involving one electron $$E_{cell}^\Theta $$ = 0.59 V at 298 K, the equilibrium constant for the cell reaction...
NEET 2019
In the electrochemical cell : $$Zn\left| {ZnS{O_4}\left( {0.01\,M} \right)} \right|$$$$\left| {CuS{O_4}\left( {1.0M} \ri...
NEET 2017
The pressure of H2 required to make the potential of H2-electrode zero in pure water at 298 K is
NEET 2016 Phase 1
The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge o...
NEET 2016 Phase 2
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because
NEET 2016 Phase 2
During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current...
NEET 2016 Phase 2
If the Eocell for a given reaction has a negative value, which of the following gives the correct relationships for the ...
NEET 2016 Phase 2
The molar conductivity of a 0.5 mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76 $$ \times $$ 10$$-$$3 S...
NEET 2016 Phase 2
A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known...
AIPMT 2015 Cancelled Paper
The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be...
AIPMT 2014
When 0.1 mol MnO$$_4^{2 - }$$ is oxidised the quantity of electricity required to completely oxidise MnO$$_4^{2 - }$$ to...
AIPMT 2014
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas ar...
NEET 2013
How many gram of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current o...
NEET 2013 (Karnataka)
Consider the half-cell reduction reaction Mn2+ + 2e$$-$$ $$ \to $$ Mn, Eo = $$-$$1.18 V Mn2+ $$ \to $$ Mn3+ + e$$-$$, ...
NEET 2013 (Karnataka)
At 25oC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm$$-$$1 cm2 mol$$-$$1 and at inf...
NEET 2013
A button cell used in watches function as following. Zn(s) + Ag2O(s) + H2O(l) $$\rightleftharpoons$$ 2Ag(s) + Zn2+(aq)...
NEET 2013
Molar conductivities $$\left( {\Lambda _m^o} \right)$$ at infinite dilution of NaCl, Hcl and CH3COONa are 126.4, 425.9 a...
AIPMT 2012 Mains
The Gibb's energy for the decomposition of Al2O3 at 500oC is as follows $${2 \over 3}$$ Al2O3 $$ \to $$ $${4 \over 3}$...
AIPMT 2012 Mains
Standard reduction potentials of the half reactions are given below : F2(g) + 2e$$-$$ $$ \to $$ 2F$$-$$(aq) ;  &...
AIPMT 2012 Mains
Limiting molar conductivity of NH4OH $$\left[ {} \right.$$i.e.  $$\Lambda _{m\left( {N{H_4}OH} \right)}^0$$$$\left...
AIPMT 2012 Prelims
The electrode potentials for Cu2+(aq) + e$$-$$ $$ \to $$ Cu+(aq) and Cu+(aq) + e$$-$$ $$ \to $$ Cu(s) are + 0.15 V an...
AIPMT 2011 Prelims
A solution contains Fe2+, Fe3+ and I$$-$$ ions. This solution was treated with iodine at 35oC. Eo for Fe3+/Fe2+ is + 0....
AIPMT 2011 Mains
Standard electrode potential for Sn4+/Sn2+ couple is + 0.15 V and that for the Cr3+/Cr couple is $$-$$ 0.74 V. These two...
AIPMT 2011 Prelims
Standard electrode potential of three metals X, Y and Z are $$-$$1.2 V, + 0.5 V and $$-$$ 3.0 V respectively. The reduci...
AIPMT 2011 Prelims
Consider the following relations for emf of an electrochemical cell (i)   EMF of cell = (Oxidation potential o...
AIPMT 2010 Mains
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
AIPMT 2010 Prelims
Which of the following expressions correctly represents the equivalent conductance at infinite diluation of Al2(SO4)3. G...
AIPMT 2010 Mains
For the reduction of silver ions with copper metal, the standard cell potential was found to be + 0.46 V at 25oC. The va...
AIPMT 2010 Prelims
Given : (i)   Cu2+ + 2e$$-$$ $$ \to $$ Cu,  Eo = 0.337 V (ii)  Cu2+ + e$$-$$ $$ \to $$ Cu...
AIPMT 2009
The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mho cm2 and at infinite dilution is 400 mho ...
AIPMT 2009
Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 $$ \times $$ 104 amperes of current is pass...
AIPMT 2009
Kohlrausch's law states that at
AIPMT 2008
Standard free energies of formation (in kJ/mol) at 298 K are $$-$$237.2, $$-$$ 394.4 and $$-$$8.2 for H2O(l), CO2(g) and...
AIPMT 2008
On the basis of the following Eo values, the strongest oxidizing agent is [Fe(CN)6]4$$-$$ $$ \to $$ [Fe(CN)6]3$$-$$ + e...
AIPMT 2008
The efficiency of a fuel cell is given by
AIPMT 2007
The equilibrium constant of the reaction: Cu(s) + 2Ag+(aq) $$ \to $$ Cu2+(aq) + 2Ag(s); Eo = 0.46 V at 298 K is ...
AIPMT 2007
A hypothetical electrochemical cell is shown below. $$A\left| {{A^ + }\left( {xM} \right)} \right|\left| {{B^ + }\left( ...
AIPMT 2006
EoFe2+/Fe = $$-$$ 0.441 V and EoFe3+/Fe2+ = 0.771 V, the standard EMF of the reaction Fe + 2Fe3+ $$ \to $$ 3Fe2+ will be...
AIPMT 2006
The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxi...
AIPMT 2005
4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al3+ solution by a certain quantity of electric charge...
AIPMT 2005
The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25oC. The equilibriu...
AIPMT 2004
On the basis of the information available from the reaction, 4/3Al + O2 $$ \to $$ 2/3Al2O3,   $$\Delta $$G = ...
AIPMT 2003
The e.m.f. of a Daniell cell at 298 K is E1. When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the ...
AIPMT 2003
In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium...
AIPMT 2002
Standard electrode potentials are Fe2+/Fe [Eo = $$-$$0.44] and Fe3+/Fe2+[ Eo = 0.77]; If Fe2+, Fe3+ and Fe blocks are ke...
AIPMT 2001
For the disproportionation of copper 2Cu+  $$ \to $$ Cu2+ + Cu, Eo is (Given Eo for Cu2+/Cu is 0.34 V and E...
AIPMT 2000
Equivalent conductances of Ba2+ and Cl$$-$$ ions are 127 and 76 ohm$$-$$1 cm$$-$$1 eq$$-$$1 respectively. Equivalent con...
AIPMT 2000

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