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Recent questions tagged electrochemistry

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.The contribution made to the standard emf of the cell by reduction half-cell is

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.The contribution made to the standard emf of the cell by oxidation half-cell is

asked Jul 21, 2014 by sreemathi.v

1 answer

Given that $E^{\large\circ}_{Fe^{3+}|Fe}$ and $E^{\large\circ}_{Fe^{2+}|Fe}$ are -0.36V and -0.439V,respectively.The value of $E^{\large\circ}_{Fe^{3+},Fe^{2+}|Pt}$ would be

asked Jul 21, 2014 by sreemathi.v

1 answer

The value of $E_{H_2O|H_2(1\;bar)|Pt}$ at 298K would be

asked Jul 21, 2014 by sreemathi.v

1 answer

Given that $E_{H_2O|H_2(1\;bar)|Pt}=0$ at 298K.The pressure of $H_2$ gas would be

asked Jul 21, 2014 by sreemathi.v

1 answer

Given that $E^{\large\circ}$ values of $Ag^+|Ag,K^+|K,Mg^{2+}|Mg$ and $Cr^{3+}|Cr$ are 0.80V,-2.93V,-2.37V,and -0.74V,respectively.Which of the following orders regarding the reducing power of metals is correct?

asked Jul 21, 2014 by sreemathi.v

1 answer

By how much will the potential of half-cell $Cu^{2+}|Cu$ change if the solution is diluted to 100 times at 298K?

asked Jul 21, 2014 by sreemathi.v

1 answer

The reduction potential of hydrogen half-cell will be negative if

asked Jul 21, 2014 by sreemathi.v

1 answer

Given : $E^{\large\circ}(Cu^{2+}|Cu)=0.337V$ and $E^{\large\circ}(Sn^{2+}|Sn)=-0.136V$.Which of the following statements is correct?

asked Jul 21, 2014 by sreemathi.v

1 answer

Two half cells have potentials -0.76V and -0.13V respectively.A galvanic cell is made from these two-half cells.Which of the following statements is correct?

asked Jul 21, 2014 by sreemathi.v

1 answer

Which of the following facts regarding the movement of anions in the solution is correct

asked Jul 21, 2014 by sreemathi.v

1 answer

Which of the following facts regarding the movements of cations in the solution is correct?

asked Jul 21, 2014 by sreemathi.v

1 answer

Which of the following statements is correct?

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following statements is correct?

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following statements is correct for a galvanic cell,written in a cell diagram?

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following statements is correct?

asked Jul 18, 2014 by sreemathi.v

1 answer

When a galvanic cell is written in a cell diagram then

asked Jul 18, 2014 by sreemathi.v

1 answer

The standard reduction potentials,$E^{\large\circ}$,for the half reactions are $Zn^{2+}+2e^-=Zn,E^{\large\circ}=-0.76V$ and $Fe^{2+}+2e^-=Fe,E^{\large\circ}=-0.41V$.The emf of the cell involving the reaction $Fe^{2+}+zn\rightarrow Zn^{2+}+Fe$ is

asked Jul 18, 2014 by sreemathi.v

1 answer

The reaction $\large\frac{1}{2}$$H_2(g)+AgCl(s)=H^+(aq)+Cl^-(aq)+Ag(s)$ occurs in the galvanic cell

asked Jul 18, 2014 by sreemathi.v

1 answer

The standard potentials at 298K for the following half reactions are given against each :$\begin{array}{1 1}Zn^{2+}(aq)+2e^-\leftrightharpoons Zn(s)\quad-0.762V&2H^+(aq)+2e^-\leftrightharpoons Cr(s)\quad 0.000V\\Cr^{3+}(aq)+3e^-\leftrightharpoons Cr(s)\quad -0.740V&Fe^{3+}(aq)+2e^-\leftrightharpoons Fe^{2+}(aq)\quad 0.770V\end{array}$.Which is the strongest reducing agent?

asked Jul 18, 2014 by sreemathi.v

1 answer

Equivalent conductivity of $Fe_2(SO_4)_3$ is related to molar conductivity by the expression

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following expressions is correct?

asked Jul 18, 2014 by sreemathi.v

1 answer

Molar conductivity of $Fe_2(SO_4)_3$ is given by

asked Jul 18, 2014 by sreemathi.v

1 answer

Equivalent conductivity of $Fe_2(SO_4)_3$ is given by

asked Jul 18, 2014 by sreemathi.v

1 answer

The equilibrium constant of acetic acid in an aqueous solution of concentration $c$ is given by

asked Jul 18, 2014 by sreemathi.v

1 answer

The degree of dissociation of a weak electrolyte is given by

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following ion is expected to have highest value of molar conductivity at infinite dilution in an aqueous solution?

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following ion is expected to have least value of molar conductivity at infinite dilution in an aqueous solution?

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following ion is expected to have highest value of molar conductivity at infinite dilution in an aqueous solution?

asked Jul 18, 2014 by sreemathi.v

1 answer

For a dilute solution of a strong electrolyte,the variation of molar conductivity with concentration is given by

asked Jul 18, 2014 by sreemathi.v

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Molar conductivity is defined as (where $k$ is the conductivity and $c$ is the molar concentration of electrolyte.)

asked Jul 18, 2014 by sreemathi.v

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Molar conductivity is defined as (where $k$ is the conductivity,$G$ is conductance and $l$ is the distance between two electrodes of conductivity cell)

asked Jul 18, 2014 by sreemathi.v

1 answer

Molar conductivity is defined as (where $k$ is the conductivity,$G$ is conductance,$l$ is the distance between two electrodes of conductivity cell and $V$ is the volume of solution containing 1 mol of electrolyte)

asked Jul 18, 2014 by sreemathi.v

1 answer

The cell constant of a conductivity cell is defined as

asked Jul 18, 2014 by sreemathi.v

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The unit of resistivity is

asked Jul 18, 2014 by sreemathi.v

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According to Ohm's law,(where the various symbols have their usual meanings)

asked Jul 18, 2014 by sreemathi.v

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The unit of molar conductivity is

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following is correct?

asked Jul 18, 2014 by sreemathi.v

1 answer

If one molecule of an electrolyte dissociates to produce $v_+$ number of cations $A^{z+}$ and $v_-$ number of anions $B^{z-}$,then the relation between molar conductivity $(\Lambda_m)$ and equivalent conductivity $(\Lambda_{eq})$ is

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following is not correct?

asked Jul 18, 2014 by sreemathi.v

1 answer

The Edison storage cell is represented as $Fe(s)/FeO(s)/KOH(aq)/Ni_2O_3(s)/Ni(s)$.The half cell reactions are $Ni_2O_3(s)+H_2O(l)+2e^-\rightarrow 2NiO(s)+2OH^-(aq)\Rightarrow E^0=0.4V$,$FeO(s)+H_2O(l)+2e^-\rightarrow Fe(s)+2OH^-(aq)\Rightarrow E^0=-0.87.V$.What will be the maximum amount of electrical energy that can be obtained from one mole of $Ni_2O_3$

asked Feb 18, 2014 by sreemathi.v

1 answer

The Edison storage cell is represented as $Fe(s)/FeO(s)/KOH(aq)/Ni_2O_3(s)/Ni(s)$.

asked Feb 18, 2014 by sreemathi.v

1 answer

$H_2O_2$ can be prepared by successive reactions

asked Feb 18, 2014 by sreemathi.v

1 answer

The voltage of cell given is -0.46V $Pt/H_2$(atm)/$NaHSO_3(0.4M),Na_2SO_3(6.44\times 10^{-3}M)\parallel Zn^{+2}(0.3M)/Zn(g)$.Also $Zn^{+2}+2e^-\rightarrow Zn(s) \leftrightharpoons E^0=-0.763$V.Then the value of $K_2=\large\frac{[H^+][SO_3^{-2}]}{[HSO_3^-]}$

asked Feb 18, 2014 by sreemathi.v

1 answer

1.26gm weight of NaOH required to be added in R.H.S to consume all the $H^+$ present in R.H.S of cell of emf to .701V at $25^{\large\circ}C$.Given: $Zn/Zn^{+2}(0.1M)\parallel HCl$(1litre)$/H_2/$(1atm)/P:-$E^0_{Zn/Zn^{+2}}=0.7602$.The emf of cell after addition of NaOH will be

asked Feb 18, 2014 by sreemathi.v

1 answer

Calculate the minimum weight of NaOH required to be added in R.H.S to consume all the $H^+$ present in R.H.S of cell of emf to .701V at $25^{\large\circ}C$.Given: $Zn/Zn^{+2}(0.1M)\parallel HCl$(1litre)$/H_2/$(1atm)/P:-$E^0_{Zn/Zn^{+2}}=0.7602$

asked Feb 18, 2014 by sreemathi.v

1 answer

Given the overall formation constant of the $[Fe(CN)_6]^{-4}$ ion as $10^{35}$ and the standard potential for half reaction $Fe^{+3}+e^-\leftrightharpoons Fe^{+2},E^0=0.77V$,$[Fe(CN)_6]^{-3}+e^-\leftrightharpoons [Fe(CN)_6]^{-4},E^0=0.36V$.Then the overall formation constant of $[Fe(CN)_6]^{-3}$ ion is

asked Feb 18, 2014 by sreemathi.v

1 answer

The EMF of cell Hg/mercurous nitrate (0.01M)$\parallel$ mercurous nitrate (0.1M)/Hg was found to be 0.0295V at $25^{\large\circ}C$ .Then molecular formula of mercurous nitrate is

asked Feb 18, 2014 by sreemathi.v

1 answer

From following molar conductivities at infinite dilution $\Lambda_m^{\large\circ}$ for $Ba(OH)_2=457.6\Omega^{-1}cm^2mol^{-1}$,$\Lambda_m^{\large\circ}$ for $BaCl_2=240.6\Omega^{-1}cm^2mol^{-1}$,$\Lambda_m^{\large\circ}$ for $NH_4Cl=129.8\Omega^{-1}cm^2mol^{-1}$.The $\Lambda_m^{\large\circ}$ for $NH_4OH$ is

asked Feb 18, 2014 by sreemathi.v

1 answer

Calculate EMF of concentration cell consisting of zinc electrodes,one immersed in a solution of 0.01M $Zn^{+2}$ ions and the other in a solution of 0.1M $Zn^{+2}$ ions at $25^{\large\circ}C$.The two solution are separated by a salt bridge

asked Feb 18, 2014 by sreemathi.v

1 answer

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