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Recent questions tagged electrochemistry
Questions
The EMF of electrode -concentration cell $Zn-Hg(C_1)/Zn^{+2}(aq)/Zn-Hg(C_2)$ at $25^{\large\circ}C$ if the concentration of zinc amalgam are $C_1=2g$ per 100g of mercury and $C_2=1g$ per 100g of mercury.
jeemain
chemistry
q80
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 18, 2014
by
sreemathi.v
1
answer
For the following galvanic cell the emf will be at $25^{\large\circ}C$.$Ag/AgCl(s),KCl(0.2M\parallel KBr(0.001M).AgBr(s)/Ag$.The solubility product of $AgCl$ & $AgBr$ are $2.8\times 10^{-10}$ and $3.3\times 10^{-13}$ respectively.
jeemain
chemistry
q79
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 18, 2014
by
sreemathi.v
1
answer
The standard reduction potential of $Ag^+/Ag$ electrode at 298K is 0.79V.$K_{sp}$ of Ag$^+$ is $8.7\times 10^{-17}$.Evaluate the standard reduction potential of $I^-/AgI/Ag$ electrode
jeemain
chemistry
q78
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 18, 2014
by
sreemathi.v
1
answer
The half potential of $Cl^{-1}(C_1)/AgCl/Ag$ electrode.Given the value of $E^0$ for $Ag^++e^-\rightarrow Ag$ and $K_{sp}$ of AgCl is
jeemain
chemistry
q77
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 18, 2014
by
sreemathi.v
1
answer
The emf of cell $Zn/ZnCl_2(0.05mol\;dm^{-3})/Ag^+/AgCl(s)/Ag$ is 1.015V at 298K,the silver electrode being positive,while the temperature coefficient of its emf is $-0.00492VK^{-1}$.Write down the equation for reaction occuring when the cell is allowed to discharge and calculate changes in entropy (s) accompanying this reaction,at 298K?
jeemain
chemistry
q76
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 18, 2014
by
sreemathi.v
1
answer
The emf of cell $Zn/ZnCl_2(0.05mol\;dm^{-3})/Ag^+/AgCl(s)/Ag$ is 1.015V at 298K,the silver electrode being positive,while the temperature coefficient of its emf is $-0.00492VK^{-1}$.Write down the equation for reaction occuring when the cell is allowed to discharge and calculate changes in free energy(G)?
jeemain
chemistry
q75
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 18, 2014
by
sreemathi.v
1
answer
Consider the relation,$2Ag^++Cd\rightarrow 2Ag+Cd^{+2}$ the standard electrode potentials for $Ag^+/Ag$ and $Cd^{+2}/Cd$ couples $0.8\;V$ and $0.04\;V$ respectively Then the emf of given reaction will be (if $[Cd^{+2}]=0.1M,[Ad^+]=1M)$
jeemain
chemistry
q74
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 18, 2014
by
sreemathi.v
1
answer
Consider the relation,$2Ag^++Cd\rightarrow 2Ag+Cd^{+2}$ the standard electrode potentials for $Ag^+/Ag$ and $Cd^{+2}/Cd$ couples 0.8V and 0.04V respectively.What is the standard potential for this reaction?
jeemain
chemistry
q73
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 18, 2014
by
sreemathi.v
1
answer
An electric current is passed through two electrolytic cells connected in series.One containing a solution of silver nitrate and the other solution of $H_2SO_4$.What volume of oxygen measured at $25^{\large\circ}C$ and 750mm of Hg would be liberated from $H_2SO_4$ if $8\times 10^{22}$ ions of $Ag^+$ are deposited from the silver nitrate solution?
jeemain
chemistry
q72
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
An electric current is passed through two electrolytic cells connected in series.One containing a solution of silver nitrate and the other solution of $H_2SO_4$.What volume of oxygen measured at $25^{\large\circ}C$ and 750mm of Hg would be liberated from $H_2SO_4$ if 1mole and of $Ag^+$ are deposited from silver nitrate solution?
jeemain
chemistry
q71
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
In an electrolysis experiment electric current was passed for 5hr through two cells connected in series.The first cell contains gold salt and second contains $CuSO_4$ solution.9.83g of gold was deposited in first cell.The magnitude of current in amperes is :-
jeemain
chemistry
q70
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
In an electrolysis experiment electric current was passed for 5hr through two cells connected in series.The first cell contains gold salt and second contains $CuSO_4$ solution.9.83g of gold was deposited in first cell.If the oxidation number of Au is +3,find the amount of copper deposited in second cell
jeemain
chemistry
q69
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
The passage of a constant current through a dilute solution of sulfuric acid with platinum electrodes,for the resulted in liberation of 336ml of mixed hydrogen and oxygen ,reduced to S.T.P.Then the strength of current is
jeemain
chemistry
q68
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
$CuSO_4$ solution(250ml) was electrolysed using a platinum anode and a copper cathode.At constant current of 2mA was passed for 16 minutes.It was found that after electrolysis the absorbance of this solution was reduced to 50% of its original value.Then the concentration of copper sulphate in solution to begin with is
jeemain
chemistry
q67
medium
mock
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
The standard reduction potential of $Cu^{+2}/Cu$ and $Ag^+/Ag$ electrode are 0.337 and 0.799Volt respectively for this positive emf galvanic cell,for what concentration of $Ag^+$ will be emf of cell at $25^{\large\circ}C$ be zero,if the concentration of $Cu^{+2}$ is 0.01M?
jeemain
chemistry
q66
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
A zinc rod is placed in $0.1\;M$ solution of $ZnSO_4$ at $25^{\large\circ}$C.Assuming that the salt is dissociated to the extent of $95\%$ at this dilusion ,then the potential of electrode at this temperature.Given that $E^0_{Zn^{2+}/Zn}=0.76Volts$.
jeemain
chemistry
q65
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
A solution of a salt of a metal of atomic weight $'\lambda'$ was electrolysed for 150minutes with 0.15A of current .The weight of metal deposited was 0.783g.Find X,the specific heat of metal=0.057Cal/$g^{\large\circ}C$.According to Dulong-Petit's law,approximate atomic weight of a metal $X$ specific heat=6.4
jeemain
chemistry
q64
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
The EMF of cell is : $Pt/H_2/CH_3COOH(0.1M)\parallel NH_4OH(0.01M)/H_2/Pt$.$K_a$ for $CH_3COOH=1.8\times 10^{-5}$ and $K_b$ for $NH_4OH=1.8\times 10^{-5}$
jeemain
chemistry
q63
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
EMF of following cell is 0.67V at 298K $Pt/H_2(1atm)/H^+(pH=X)\parallel KCl(1N)/Hg_2Cl_2(s)/Hg$.Calculate pH of anode compartment.Given : $E^0_{Cl^-/Hg^2Cl_2/Hg}=0.28V$.
jeemain
chemistry
q62
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
By how much is oxidizing power of $MnO_4^-/Mn^{+2}$ couple decreases if the $H^+$ concentration is decreased from 1M to $10^{-4}$M at $25^{\large\circ}C$ .Assume other species have no change in concentration.
jeemain
chemistry
q61
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
The EMF of cell $Ag/AgCl(K_{sp})(saturated\; sol)\parallel Cl^-(C_1)/AgCl(K_{sp}/Ag)$ is given by
jeemain
chemistry
q60
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
How many Faradays are required to reduce on mole of $MnO_4^-$ to $Mn^{+2}$
jeemain
chemistry
q59
easy
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
The $E_{cell}$ in which the reaction :$MnO_4^-+Fe^{+2}+H^+\rightarrow Mn^{+2}+Fe^{+3}+H_2O$ occurs is 0.59V at $25^{\large\circ}C$.The equilibrium constant for the reaction is
jeemain
chemistry
q58
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
$Zn/Zn^{+2}(C_1)\parallel Zn^{+2}(C_2)/Zn$.For this cell $\Delta G$ is -ve if
jeemain
chemistry
q57
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
Which of the following facts is not true?
jeemain
chemistry
q56
difficult
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
If $E^0_{Fe^{+2}/Fe}$ is $X_1$,$E^0_{Fe^{+3}/Fe}$ is $X_2$ then $E^0_{Fe^{+3}/Fe^{+2}}$ will be
jeemain
chemistry
q55
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
A solution containing one mole per litre each of $Cu(NO_3)_2,AgNO_3,Hg_2(NO_3)_2,Mg(NO_3)_2$ is being electrolysed by using inert electrodes.The values of standard potentials are $E^0_{Ag^+/Ag}=0.8V$,$E^0_{Hg^{+2}/Hg}=0.79V$,$E^0_{Cu^{+2}/Cu}=0.34V$,$E^0_{Mg^{+2}/Mg}=-2.3V$ with increasing voltage the sequence of deposition of metals on the cathode will be
jeemain
chemistry
q54
easy
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
A current of 2A when passed for five hour through a molten metal salt,it deposits 22.2g of metal of atomic weight 177.The oxidation state of metal in metal salt is
jeemain
chemistry
q53
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
The standard reduction potentials at 298K for following half reaction are given against each.
$Zn^{+2}(aq)+2e^-\leftrightharpoons 2n(s)=-0.762$
$Cr^{+3}(aq)+3e^-\leftrightharpoons Cr(s)=-0.740$
$2H^+(aq)+3e^-\leftrightharpoons H_2(g)=0$
$Fe^{+3}(aq)+e^-\leftrightharpoons Fe^{+2}(aq)=0.770$.
Which is the strongest reducing agent ?
jeemain
chemistry
q52
easy
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
Four moles of electrons were transferred from anode to cathode in an experiment of electrolysis of water.The total volume of two gases produced will be approximately(in litre) at STP.
jeemain
chemistry
q51
medium
physical-chemistry
class12
ch3
electrochemistry
asked
Feb 17, 2014
by
sreemathi.v
1
answer
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