Recent questions tagged electrochemistry

Dissolution of an electrolyte in water into negative positive ions is called

asked Sep 16, 2015 by meena.p

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The theory of ionization was represented by

asked Sep 16, 2015 by meena.p

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An electrolyte is a substance which :

asked Sep 16, 2015 by meena.p

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A dilute aqueous solution of $Na_2SO_4$ is electrolysed using platinum electrodes.The products at the anode and cathode are

asked Jul 23, 2014 by sreemathi.v

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Of the following,the metals that cannot be obtained by electrolysis of the aqueous solution of their salts are

asked Jul 23, 2014 by sreemathi.v

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Which of the following does not evolve oxygen at anode when the electrolysis is carried out of

asked Jul 23, 2014 by sreemathi.v

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In acidic medium,$MnO_4^-$ is converted to $Mn^{2+}$ when acts as an oxidizing agent.The quantity of electricity required to reduce 0.05 mol of $MnO_4^-$ would be

asked Jul 23, 2014 by sreemathi.v

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In an electrolysis of a metallic chloride 3.283 g of the metal (molar mass $197gmol^{-1}$) was deposited on the cathode by the passage of 4825C of electric charge.The charge number of metal ion is

asked Jul 23, 2014 by sreemathi.v

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In the electrolysis of alkaline water,a total of 1 mol of gases is evolved.The amount of water decomposed would be

asked Jul 23, 2014 by sreemathi.v

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The reaction occuring at anode when the electrolysis of $CuSO_4$ is done using Pt electrode,is

asked Jul 23, 2014 by sreemathi.v

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On passing an electric current,the quantity of deposition of a metal on cathode depends on the

asked Jul 23, 2014 by sreemathi.v

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In the electrolysis of $CuCl_2$ solution using copper electrode,if 2.5g of Cu is deposited at cathode,then at anode

asked Jul 23, 2014 by sreemathi.v

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In an electrolysis of an aqueous solution of sodium sulphate,2.4L of oxygen at STP was liberated at anode.The volume of hydrogen at STP liberated at cathode would be

asked Jul 23, 2014 by sreemathi.v

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When a lead storage cell is charged

asked Jul 23, 2014 by sreemathi.v

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The time required to coat a metal surface of $80cm^2$ with $5\times 10^{-3}$cm thick layer of silver (density $10.5gcm^{-3})$ with the passage of 3A current through a silver nitrate solution is

asked Jul 23, 2014 by sreemathi.v

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A current of $9.65A$ is passed for 3h between nickel electrodes in 0.5L of a 2M solution of $Ni(NO_3)_2$.The molarity of solution after electrolysis would be

asked Jul 23, 2014 by sreemathi.v

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The density of Cu is $8.94gcm^{-3}$.The quantity of electricity needed to plate an area 10 cm $\times$ 10 cm to a thickness of $10^{-2}$cm using $CuSO_4$ solution is

asked Jul 23, 2014 by sreemathi.v

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In an electrolytic cell,which of the facts is not true?

asked Jul 23, 2014 by sreemathi.v

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Which of the following expressions regarding the electrolysis of an electrolytic solution is represented correctly?

asked Jul 23, 2014 by sreemathi.v

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Which of the following expressions is written correctly?

asked Jul 23, 2014 by sreemathi.v

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When a lead storage battery is discharged

asked Jul 23, 2014 by sreemathi.v

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A solution of sodium sulphate in water is electrolysed using inert electrodes.The products at the cathode and anode are respectively

asked Jul 23, 2014 by sreemathi.v

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Faraday's law of electrolysis are related to the

asked Jul 23, 2014 by sreemathi.v

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Molten sodium chloride conducts electricity due to the presence of

asked Jul 23, 2014 by sreemathi.v

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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

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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

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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

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A standard hydrogen electrode has zero electrode potential because

asked Jul 22, 2014 by sreemathi.v

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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

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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

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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

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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

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Which of the following facts is not true?

asked Jul 21, 2014 by sreemathi.v

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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

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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

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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

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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

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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

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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

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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

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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

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