Electrochemistry

A conductivity cell with two electrodes (dark side) are half filled with infinitely dilute aqueous solution of a weak electrolyte. If volume is doubled by adding more water at constant temperature, the molar conductivity of the cell will -

How can an electrochemical cell be converted into an electrolytic cell ?

Molar ionic conductivities of divalent cation and anion are \(57 \mathrm{~S~cm}^2 \mathrm{~mol}^{-1}\) and \(73 \mathrm{~S~cm}^2 \mathrm{~mol}^{-1}\) respectively. The molar conductivity of solution of an electrolyte with the above cation a...

The reaction at cathode in the cells commonly used in clocks involves.

For the electro chemical cell
\(\mathrm{M}\left|\mathrm{M}^{2+}\right||\mathrm{X}| \mathrm{X}^{2-}\)
If \(\mathrm{E}_{\left(\mathrm{M}^{2+} / \mathrm{M}\right)}^0=0.46 \mathrm{~V}\) and $$\mathrm{E}_{\left(\mathrm{x} / \mathrm{x}^{2-}\right...

The quantity of silver deposited when one coulomb charge is passed through \(\mathrm{AgNO}_3\) solution :

What pressure (bar) of \(\mathrm{H}_2\) would be required to make emf of hydrogen electrode zero in pure water at \(25^{\circ} \mathrm{C}\) ?

One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?

For a strong electrolyte, a plot of molar conductivity against (concentration) \({ }^{1 / 2}\) is a straight line, with a negative slope, the correct unit for the slope is

Fuel cell, using hydrogen and oxygen as fuels,
A. has been used in spaceship
B. has as efficiency of \(40 \%\) to produce electricity
C. uses aluminum as catalysts
D. is eco-friendly
E. is actually a type of Galvanic cell only
Choose the co...

One Faraday of electricity liberates \(x \times 10^{-1}\) gram atom of copper from copper sulphate. \(x\) is ________.

Number of alkanes obtained on electrolysis of a mixture of \(\mathrm{CH}_3 \mathrm{COONa}\) and \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{COONa}\) is ________.

Identify the factor from the following that does not affect electrolytic conductance of a solution.

The values of conductivity of some materials at $298.15 \mathrm{~K}^{-1} ~\text{in} ~\mathrm{Sm}^{-1}$ are $2.1 \times 10^3$, $1.0 \times 10^{-16}, 1.2 \times 10,3.91,1.5 \times 10^{-2}, 1 \times 10^{-7}, 1.0 \times 10^3$. The number of con...

Reduction potential of ions are given below:
$$\begin{array}{ccc}
\mathrm{ClO}_4^{-} & \mathrm{IO}_4^{-} & \mathrm{BrO}_4^{-} \\
\mathrm{E}^{\circ}=1.19 \mathrm{~V} & \mathrm{E}^{\circ}=1.65 \mathrm{~V} & \mathrm{E}^{\circ}=1.74 \mathrm{~V}...

Alkaline oxidative fusion of \(\mathrm{MnO}_2\) gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are

The mass of zinc produced by the electrolysis of zine sulphate solution with a steady current of \(0.015 \mathrm{~A}\) for 15 minutes is _________ \(\times 10^{-4} \mathrm{~g}\).
(Atomic mass of zinc \(=65.4 \mathrm{~amu}\))

A constant current was passed through a solution of \(\mathrm{AuCl}_4^{-}\) ion between gold electrodes. After a period of 10.0 minutes, the increase in mass of cathode was \(1.314 \mathrm{~g}\). The total charge passed through the solution...

The mass of silver (Molar mass of \(\mathrm{Ag}: 108 \mathrm{~gmol}^{-1}\) ) displaced by a quantity of electricity which displaces \(5600 \mathrm{~mL}\) of \(\mathrm{O}_2\) at S.T.P. will be ______ g.

The hydrogen electrode is dipped in a solution of \(\mathrm{pH}=3\) at \(25^{\circ} \mathrm{C}\). The potential of the electrode will be _________ \(\times 10^{-2} \mathrm{~V}\).
$$\left(\frac{2.303 \mathrm{RT}}{\mathrm{F}}=0.059 \mathrm{~V...

Which of the following statements is not correct about rusting of iron?

The potential for the given half cell at $298 \mathrm{~K}$ is (-) __________ $\times 10^{-2} \mathrm{~V}$
$$
\begin{aligned}
& 2 \mathrm{H}_{(\mathrm{aq})}^{+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{H}_2(\mathrm{~g}) \\\\
& {\left[\mathrm...

Consider the following redox reaction :
\(\mathrm{MnO}_4^{-}+\mathrm{H}^{+}+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \rightleftharpoons \mathrm{Mn}^{2+}+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2\)

The standard reduction potentials are given as...

The amount of electricity in Coulomb required for the oxidation of $1 \mathrm{~mol}$ of $\mathrm{H}_2 \mathrm{O}$ to $\mathrm{O}_2$ is __________ $\times 10^5 \mathrm{C}$.

The reaction
\(\frac{1}{2} \mathrm{H}_{2}(\mathrm{~g})+\mathrm{AgCl}(\mathrm{s}) \rightleftharpoons \mathrm{H}^{+}(\mathrm{aq})+\mathrm{Cl}^{-}(\mathrm{aq})+\mathrm{Ag}(\mathrm{s})\)
occurs in which of the given galvanic cell.

The number of incorrect statements from the following is ___________.
A. The electrical work that a reaction can perform at constant pressure and temperature is equal to the reaction Gibbs energy.
B. \(\mathrm{E_{cell}^{\circ}}\) cell is de...

The standard electrode potential of \(\mathrm{M}^{+} / \mathrm{M}\) in aqueous solution does not depend on

The standard reduction potentials at \(298 \mathrm{~K}\) for the following half cells are given below:
$$\mathrm{NO}_{3}^{-}+4 \mathrm{H}^{+}+3 \mathrm{e}^{-} \rightarrow \mathrm{NO}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O} \quad \mathrm{E}^...

The logarithm of equilibrium constant for the reaction \(\mathrm{Pd}^{2+}+4 \mathrm{Cl}^{-} \rightleftharpoons \mathrm{PdCl}_{4}^{2-}\) is ___________ (Nearest integer)
Given : \(\frac{2.303 R \mathrm{~T}}{\mathrm{~F}}=0.06 \mathrm{~V}\)
$$...

Which one of the following statements is correct for electrolysis of brine solution?

The resistivity of a $0.8 \mathrm{M}$ solution of an electrolyte is $5 \times 10^{-3} \Omega~ \mathrm{cm}$. Its molar conductivity is _________ $\times 10^{4}~ \Omega^{-1} \mathrm{~cm}^{2} \mathrm{~mol}^{-1}$. (Nearest integer)

Consider the cell
$$\mathrm{Pt}_{(\mathrm{s})}\left|\mathrm{H}_{2}(\mathrm{~g}, 1 \mathrm{~atm})\right| \mathrm{H}^{+}(\mathrm{aq}, 1 \mathrm{M})|| \mathrm{Fe}^{3+}(\mathrm{aq}), \mathrm{Fe}^{2+}(\mathrm{aq}) \mid \operatorname{Pt}(\mathrm{...

The electrode potential of the following half cell at $298 \mathrm{~K}$

$\mathrm{X}\left|\mathrm{X}^{2+}(0.001 \mathrm{M}) \| \mathrm{Y}^{2+}(0.01 \mathrm{M})\right| \mathrm{Y}$ is _______ $\times 10^{-2} \mathrm{~V}$ (Nearest integer)

Gi...

Following figure shows dependence of molar conductance of two electrolytes on concentration. \(\Lambda \mathop m\limits^o\) is the limiting molar conductivity.

The number of \(\mathrm{\underline {incorrect} }\) statement(s) from the follo...

The standard electrode potential \(\mathrm{(M^{3+}/M^{2+})}\) for V, Cr, Mn & Co are \(-\)0.26 V, \(-\)0.41 V, + 1.57 V and + 1.97 V, respectively. The metal ions which can liberate \(\mathrm{H_2}\) from a dilute acid are :

The equilibrium constant for the reaction
\(\mathrm{Zn(s)+Sn^{2+}(aq)}\) \(\rightleftharpoons\) \(\mathrm{Zn^{2+}(aq)+Sn(s)}\) is \(1\times10^{20}\) at 298 K. The magnitude of standard electrode potential of \(\mathrm{Sn/Sn^{2+}}\) if $$\ma...

Consider the cell
\(\mathrm{Pt(s)|{H_2}(g)\,(1\,atm)|{H^ + }\,(aq,[{H^ + }] = 1)||F{e^{3 + }}(aq),F{e^{2 + }}(aq)|Pt(s)}\)
Given \(\mathrm{E_{F{e^{3 + }}/F{e^{2 + }}}^o = 0.771\,V}\) and $$\mathrm{E_{{H^ + }/1/2\,{H_2}}^o = 0\,V,\,T = 298\,...

\(Pt(s)|{H_2}(g)(1\,bar)|{H^ + }(aq)(1\,M)||{M^{3 + }}(aq),{M^ + }(aq)|Pt(s)\)
The \(\mathrm{E_{cell}}\) for the given cell is 0.1115 V at 298 K when \({{\left[ {{M^ + }(aq)} \right]} \over {\left[ {{M^{3 + }}(aq)} \right]}} = {10^a}\)
The ...

At 298 K, a 1 litre solution containing 10 mmol of \(\mathrm{C{r_2}O_7^{2 - }}\) and 100 mmol of \(\mathrm{Cr^{3+}}\) shows a pH of 3.0.
Given : \(\mathrm{C{r_2}O_7^{2 - } \to C{r^{3 + }}\,;\,E^\circ = 1.330}\)V
and $$\mathrm{{{2.303\,RT} ...

Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.

At what pH, given half cell \(\mathrm{MnO_{4}^{-}(0.1~M)~|~Mn^{2+}(0.001~M)}\) will have electrode potential of 1.282 V? ___________ (Nearest Integer)
Given $$\mathrm{E_{MnO_4^ - |M{n^{2 + }}}^o}=1.54~\mathrm{V},\frac{2.303\mathrm{RT}}{\mat...

\(1 \times 10^{-5} ~\mathrm{M} ~\mathrm{AgNO}_{3}\) is added to \(1 \mathrm{~L}\) of saturated solution of \(\mathrm{AgBr}\). The conductivity of this solution at \(298 \mathrm{~K}\) is _____________ $$\times 10^{-8} \mathrm{~S} \mathrm{~m}...

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A) : An aqueous solution of \(\mathrm{KOH}\) when used for volumetric analysis, its concentration should be checked before ...

The number of correct statements from the following is _______.
(A) Conductivity always decreases with decrease in concentration for both strong and weak electrolytes.

(B) The number of ions per unit volume that carry current in a solution...

A metal surface of \(100 \mathrm{~cm}^{2}\) area has to be coated with nickel layer of thickness \(0.001 \mathrm{~mm}\). A current of \(2 \mathrm{~A}\) was passed through a solution of \(\mathrm{Ni}\left(\mathrm{NO}_{3}\right)_{2}\) for '$$...

At \(298 \mathrm{~K}\), the standard reduction potential for \(\mathrm{Cu}^{2+} / \mathrm{Cu}\) electrode is \(0.34 \mathrm{~V}\).
Given : \(\mathrm{K}_{\mathrm{sp}} \mathrm{Cu}(\mathrm{OH})_{2}=1 \times 10^{-20}\)
Take $$\frac{2.303 \mathr...

For lead storage battery pick the correct statements
A. During charging of battery, \(\mathrm{PbSO}_{4}\) on anode is converted into \(\mathrm{PbO}_{2}\)
B. During charging of battery, \(\mathrm{PbSO}_{4}\) on cathode is converted into $$\m...

In an electrochemical reaction of lead, at standard temperature, if \(\mathrm{E}^{0}\left(\mathrm{~Pb}^{2+} / \mathrm{Pb}\right)=\mathrm{m}\) Volt and \(\mathrm{E}^{0}\left(\mathrm{~Pb}^{4+} / \mathrm{Pb}\right)=\mathrm{n}\) Volt, then the ...

The number of correct statements from the following is __________
A. \(\mathrm{E_{\text {cell }}}\) is an intensive parameter
B. A negative \(\mathrm{E}^{\ominus}\) means that the redox couple is a stronger reducing agent than the $$\mathrm...

\(\mathrm{FeO_4^{2 - }\buildrel { + 2.2V} \over \longrightarrow F{e^{3 + }}\buildrel { + 0.70V} \over \longrightarrow F{e^{2 + }}\buildrel { - 0.45V} \over \longrightarrow F{e^0}}\)
\(E_{FeO_4^{2 - }/F{e^{2 + }}}^\theta\) is $$x \times ...