Electrochemistry

The specific conductance of \(0.0025 ~\mathrm{M}\) acetic acid is \(5 \times 10^{-5} \mathrm{~S} \mathrm{~cm}^{-1}\) at a certain temperature. The dissociation constant of acetic acid is __________ \(\times ~10^{-7}\) (Nearest integer)
Cons...

In which of the following half cells, electrochemical reaction is pH dependent?

A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced a STP is _____________ cm3. (Nearest integer)
[Given : Faraday constant F = 965...

The cell potential for the given cell at 298 K
Pt| H2 (g, 1 bar) | H+ (aq) || Cu2+ (aq) | Cu(s)
is 0.31 V. The pH of the acidic solution is found to be 3, whereas the concentration of Cu2+ is 10\(-\)x M. The value of x is ___________.
(Give...

Resistance of a conductivity cell (cell constant \(129 \mathrm{~m}^{-1}\)) filled with \(74.5 \,\mathrm{ppm}\) solution of \(\mathrm{KCl}\) is \(100 \,\Omega\) (labelled as solution 1). When the same cell is filled with \(\mathrm{KCl}\) sol...

For a cell, \(\mathrm{Cu}(\mathrm{s})\left|\mathrm{Cu}^{2+}(0.001 \,\mathrm{M}) \| \mathrm{Ag}^{+}(0.01 \,\mathrm{M})\right| \mathrm{Ag}(\mathrm{s})\)
the cell potential is found to be \(0.43 \mathrm{~V}\) at \(298 \mathrm{~K}\). The magnit...

The quantity of electricity in Faraday needed to reduce 1 mol of Cr2O\(_7^{2 - }\) to Cr3+ is ____________.

For the given reactions
Sn2+ + 2e\(-\) \(\to\) Sn
Sn4+ + 4e\(-\) \(\to\) Sn
the electrode potentials are ; \(E_{S{n^{2 + }}/Sn}^o = - 0.140\) V and \(E_{S{n^{4 + }}/Sn}^o = + 0.010\) V. The magnitude of standard electrode potential for $$...

Match List - I with List - II.

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The limiting molar conductivities of NaI, NaNO3 and AgNO3 are 12.7, 12.0 and 13.3 mS m2 mol\(-\)1, respectively (all at 25\(^\circ\)C). The limiting molar conductivity of AgI at this temperature is ____________ mS m2 mol\(-\)1.

For the reaction taking place in the cell :
Pt (s)| H2 (g)|H+(aq) || Ag+(aq) |Ag (s)
E\(_{cell}^o\) = + 0.5332 V.
The value of \(\Delta\)fG\(^\circ\) is ______________ kJ mol\(-\)1. (in nearest integer)

In 3d series, the metal having the highest M2+/M standard electrode potential is :

Given below are two statements :
Statement I : For KI, molar conductivity increases steeply with dilution
Statement II : For carbonic acid, molar conductivity increases slowly with dilution
In the light of the above statements, choose the c...

The \({\left( {{{\partial E} \over {\partial T}}} \right)_P}\) of different types of half cells are as follows:

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Cu(s) + Sn2+ (0.001M) \(\to\) Cu2+ (0.01M) + Sn(s)
The Gibbs free energy change for the above reaction at 298 K is x \(\times\) 10\(-\)1 kJ mol\(-\)1. The value of x is __________. [nearest integer]
[Given : $$E_{C{u^{2 + }}/Cu}^\Theta = 0...

The amount of charge in \(\mathrm{F}\) (Faraday) required to obtain one mole of iron from \(\mathrm{Fe}_{3} \mathrm{O}_{4}\) is ___________. (Nearest Integer)

In a cell, the following reactions take place
\(\matrix{ {F{e^{2 + }} \to F{e^{3 + }} + {e^ - }} & {E_{F{e^{3 + }}/F{e^{2 + }}}^o = 0.77\,V} \cr {2{I^ - } \to {I_2} + 2{e^ - }} & {E_{{I_2}/{I^ - }}^o = 0.54\,V} \cr }\)
The stan...

A solution of Fe2(SO4)3 is electrolyzed for 'x' min with a current of 1.5 A to deposit 0.3482 g of Fe. The value of x is ___________. [nearest integer]
Given : 1 F = 96500 C mol\(-\)1
Atomic mass of Fe = 56 g mol\(-\)1

The correct order of reduction potentials of the following pairs is
A. Cl2/Cl\(-\)
B. I2/I\(-\)
C. Ag+/Ag
D. Na+/Na
E. Li+/Li
Choose the correct answer from the options given below.

The cell potential for \(\mathrm{Zn}\left|\mathrm{Zn}^{2+}(\mathrm{aq})\right|\left|\mathrm{Sn}^{x+}\right| \mathrm{Sn}\) is \(0.801 \mathrm{~V}\) at \(298 \mathrm{~K}\). The reaction quotient for the above reaction is \(10^{-2}\). The numb...

The spin-only magnetic moment value of M3+ ion (in gaseous state) from the pairs Cr3+ / Cr2+, Mn3+ / Mn2+, Fe3+ / Fe2+ and Co3+ / Co2+ that has negative standard electrode potential, is ____________ B.M. [Nearest integer]

The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is \({\Lambda _{m1}}\) and that of 20 moles another identical cell heaving 80 mL NaCl solution is \({\Lambda _{m2}}\). The conductivities exhibited by...

The cell potential for the following cell
Pt |H2(g)|H+ (aq)|| Cu2+ (0.01 M)|Cu(s)
is 0.576 V at 298 K. The pH of the solution is __________. (Nearest integer)
(Given : \(E_{C{u^{2 + }}/Cu}^o = 0.34\) V and \({{2.303\,RT} \over F} = 0.06\) V...

The resistance of a conductivity cell containing 0.01 M KCl solution at 298 K is 1750 \(\Omega\). If the conductivity of 0.01 M KCl solution at 298 K is 0.152 \(\times\) 10\(-\)3 S cm\(-\)1, then the cell constant of the conductivity cell i...

Consider the following cell reaction :\(C{d_{(s)}} + H{g_2}S{O_{4(s)}} + {9 \over 5}{H_2}{O_{(l)}}\) \(\rightleftharpoons\) \(CdS{O_4}.{9 \over 5}{H_2}{O_{(s)}} + 2H{g_{(l)}}\)The value of \(E_{cell}^0\) is 4.315 V at 25\(^\circ\)C. If $$\D...

Match List - I with List - II



List - I(Parmeter)

List - II(Unit)




(a)
Cell constant
(i)
\(S\,c{m^2}mo{l^{ - 1}}\)


(b)
Molar conductivity
(ii)
Dimensionless


(c)
...

The conductivity of a weak acid HA of concentration 0.001 mol L\(-\)1 is 2.0 \(\times\) 10\(-\)5 S cm\(-\)1. If \(\Lambda _m^o\)(HA) = 190 S cm2 mol\(-\)1, the ionization constant (Ka) of HA is equal to ______________ \(\times\) 10\(-\)6. (...

For the cellCu(s) | Cu2+ (aq) (0.1 M) || Ag+(aq) (0.01 M) | Ag(s)the cell potential E1 = 0.3095 VFor the cellCu(s) | Cu2+ (aq) (0.01 M) || Ag+(aq) (0.001 M) | Ag(s)the cell potential = ____________ \(\times\) 10\(-\)2 V. (Round off the near...

The resistance of a conductivity cell with cell constant 1.14 cm\(-\)1, containing 0.001 M KCl at 298 K is 1500 \(\Omega\). The molar conductivity of 0.001 M KCl solution at 298 K in S cm2 mol\(-\)1 is ____________. (Integer answer)

Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is :

Consider the following reaction\(MnO_4^ - + 8{H^ + } + 5{e^ - } \to M{n^{ + 2}} + 4{H_2}O,{E^o} = 1.51V\).The quantity of electricity required in Faraday to reduce five moles of \(MnO_4^ -\) is ___________. (Integer answer)

Emf of the following cell at 298K in V is x \(\times\) 10\(-\)2.Zn|Zn2+(0.1 M)||Ag+ (0.01 M)|AgThe value of x is _________. (Rounded off to the nearest integer)[Given : $$E_{Z{n^{2 + }}/Zn}^\theta = - 0.76V;E_{A{g^{2 + }}/Ag}^\theta = +...

These are physical properties of an element(A) Sublimation enthalpy(B) Ionisation enthalpy(C) Hydration enthalpy(D) Electron gain enthalpyThe total number of above properties that affect the reduction potential is ____________ (Integer answ...

Given below are two statements :Statement I : The limiting molar conductivity of KCl (strong electrolyte) is higher compared to that of CH3COOH (weak electrolyte).Statement II : Molar conductivity decreases with decrease in concentration of...

For the galvanic cell,Zn(s) + Cu2+ (0.02 M) \(\to\) Zn2+ (0.04 M) + Cu(s),Ecell = ______________ \(\times\) 10\(-\)2 V. (Nearest integer)[Use : \(E_{Cu/C{u^{2 + }}}^0\) = \(-\) 0.34 V, \(E_{Zn/Z{n^{2 + }}}^0\) = + 0.76 V, $${{2.303RT} \over...

Consider the cell at 25\(^\circ\)CZn | Zn2+ (aq), (1M) || Fe3+ (aq), Fe2+ (aq) | Pt(s)The fraction of total iron present as Fe3+ ion at the cell potential of 1.500 V is x \(\times\) 10\(-\)2. The value of x is ______________. (Nearest integ...

Copper reduces NO\(_3^ -\) into NO and NO2 depending upon the concentration of HNO3 in solution. (Assuming fixed [Cu2+] and PNO = PNO2), the HNO3 concentration at which the thermodynamic tendency for reduction of NO\(_3^ -\) into NO and N...

The electrode potential of M2+/M of 3d-series elements shows positive value for :

The magnitude of the change in oxidising power of the \(MnO_4^ - /M{n^{2 + }}\) couple is x \(\times\) 10\(-\)4 V, if the H+ concentration is decreased from 1M to 10\(-\)4 M at 25\(^\circ\)C. (Assume concentration of \(MnO_4^ -\) and $$M{n...

Assume a cell with the following reaction\(C{u_{(s)}} + 2A{g^ + }(1 \times {10^{ - 3}}M) \to C{u^{2 + }}(0.250M) + 2A{g_{(s)}}\)\(E_{cell}^\Theta = 2.97\) VEcell for the above reaction is ______________ V. (Nearest integer)[Given : log 2.5...

Potassium chlorate is prepared by electrolysis of KCl in basic solution as shown by following equation.6OH\(-\) + Cl\(-\) \(\to\) ClO3\(-\) + 3H2O + 6e\(-\)A current of xA has to be passed for 10h to produce 10.0g of potassium chlorate. The...

If the conductivity of mercury at 0\(^\circ\)C is 1.07 \(\times\) 106 S m\(-\)1 and the resistance of a cell containing mercury is 0.243\(\Omega\), then the cell constant of the cell is x \(\times\) 104 m\(-\)1. The value of x is __________...

For the reaction 2Fe3+(aq) + 2I\(-\)(aq) \(\to\) 2Fe2+(aq) + I2(s) the magnitude of the standard molar Gibbs free energy change, \(\Delta\)rG\(_m^o\) = \(-\) ___________ kJ (Round off to the Nearest Integer).$$\left[ {\matrix{
{E_{F{e^...

The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 S cm2 mol\(-\)1 respectively. The molar conductivity at infinite dilution of barium sulphate is _________ S cm2 mol$...

A KCl solution of conductivity 0.14 S m\(-\)1 shows a resistance of 4.19\(\Omega\) in a conductivity cell. If the same cell is filled with an HCl solution, the resistance drops to 1.03\(\Omega\). The conductivity of the HCl solution is ____...

A 5.0 m mol dm\(-\)3 aqueous solution of KCl has a conductance of 0.55 mS when measured in a cell of cell constant 1.3 cm\(-\)1. The molar conductivity of this solution is ___________ mSm2 mol\(-\)1. (Round off to the Nearest Integer).

108 g of silver (molar mass 108 g mol–1) is
deposited at cathode from AgNO3(aq) solution
by a certain quantity of electricity. The
volume (in L) of oxygen gas produced at
273 K and 1 bar pressure from water by the
same quantity of electrici...

What would be the electrode potential for the given half cell reaction at pH = 5?
______.
2H2O \(\to\) O2 + 4H\(\oplus\) + 4e– ;
\(E_{red}^0\) = 1.23 V
(R = 8.314 J mol–1 K–1 ; Temp = 298 k; oxygen under std. atm. pressure of 1 bar)

For an electrochemical cell
Sn(s) | Sn2+ (aq,1M)||Pb2+ (aq,1M)|Pb(s)
the ratio \({{\left[ {S{n^{2 + }}} \right]} \over {\left[ {P{b^{2 + }}} \right]}}\) when this cell attains
equilibrium is _________.

(Given $$E_{S{n^{2 + }}|Sn}^0 = - 0....

Given that the standard potentials (Eo) of Cu2+/Cu and Cu+/Cu are 0.34 V and 0.522 V respectively, the Eo of Cu2+/Cu+ :