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Recent questions tagged galvanic-cells

For the electrochemical cell,$M|M^+||X^-|X,E^{\large\circ}(M^+|M)=0.44V$ and $E^{\large\circ}(X|X^-)=0.33V$.From this data one can deduce that

asked Jul 22, 2014 by sreemathi.v

1 answer

A gas X at 1 atm is bubbled through a solution containing a mixture of 1M Y and 1M Z at $25^{\large\circ}C$.If the reduction potential of $Z > Y > X$,then

asked Jul 22, 2014 by sreemathi.v

1 answer

The standard reduction potential values of three metallic cations,X,Y,Z are 0.52,-3.03 and -1.18V,respectively.The order of reducing power of the corresponding metals is

asked Jul 22, 2014 by sreemathi.v

1 answer

A standard hydrogen electrode has zero electrode potential because

asked Jul 22, 2014 by sreemathi.v

1 answer

The standard reduction potentials of $Cu^{2+}|Cu$ and $Cu^{2+}|Cu^+$ are 0.337V and 0.153V, respectively.The standard electrode potential of $Cu^+|Cu$ half cell is

asked Jul 22, 2014 by sreemathi.v

1 answer

A solution containing one mole per litre each of $Cu(NO_3)_2,AgNO_3,Hg_2(NO_3)_2$ is being electrolysed by using inert electrodes.The values of standard potentials are $E^{\large\circ}_{Ag^+|Ag}=0.80V,E^{\large\circ}_{Hg_2^{2+}|Hg}=0.79V,E^{\large\circ}_{Cu^{2+}|Cu}=0.34V,E^{\large\circ}_{Mg^{2+}|Mg}=-2.3V$ with increasing voltage,the sequence of deposition of metals on the cathode will be

asked Jul 22, 2014 by sreemathi.v

1 answer

Adding powdered Pb and Fe to a solution containing 1.0M in each of $Pb^{2+}$ and $Fe^{2+}$ ions would result into the formation of

asked Jul 22, 2014 by sreemathi.v

1 answer

Consider the cell potentials $E^{\large\circ}_{Mg^{2+}|Mg}=-2.37V$ and $E^{\large\circ}_{Fe^{3+}|Fe}=-0.04V$.The best reducing agent would be

asked Jul 21, 2014 by sreemathi.v

1 answer

Which of the following facts is not true?

asked Jul 21, 2014 by sreemathi.v

1 answer

The following facts are available.\[\begin{array}{1 1}2X^-+Y_2\rightarrow 2Y^-+X_2\\2W^-+Y_2\rightarrow\text{No reaction}\\2Z^-+X_2\rightarrow 2X^-+Z_2\end{array}\] Which of the following statements is correct?

asked Jul 21, 2014 by sreemathi.v

1 answer

The current of 9.65A is drawn from a Daniell cell for exactly 1h.If molar masses of Cu and Zn are $63.5gmol^{-1}$ and $6.54gmol^{-1}$,respectively,the loss in mass at anode and gain in mass at cathode,respectively,are

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 strongest reductant 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 strongest oxidant 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 : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Reducing $[Cr^{3+}]$ to 0.50M,keeping all other concentrations at unity,the emf of the cell would be changed by

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 : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.If $[Cr_2O_7^{2-}]=1.0M,[Cr^{3+}]=0.5M,[Fe^{2+}]=0.5M,[Fe^{3+}]=2.0M$ and $[H_3O^+]=2.0M$,then the cell emf at 298K would be

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 : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Increasing $[H_3O^{+}]$ to 2.0M, keeping all other concentrations at unity,will change the cell emf by

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 : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Increasing $[Fe^{3+}]$ to 2.0M keeping all other concentrations at unity,the emf of the cell is changed by

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 : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Reducing $[Fe^{3+}]$ to 0.50M keeping all other concentrations at unity,the emf of the cell will be changed by

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 : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Upon discharge of the cell for 80 min at one ampere,the anode was found to have decreased in mass by

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 cell emf is independent of

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 cell emf depends on

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 : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Within the cell,it is important to prevent mixing or direct contact of

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 cathode of the cell might be

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 anode of the cell might be

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 cell emf could be increased above the standard emf by

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 standard emf of the 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 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

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