Electrochemistry PYQs - Last 5 Years
MHT CET / Chemistry / Physical Chemistry / 175 recent questions
ChemistryPhysical Chemistry2022-2026
Practice 175 MHT CET Chemistry questions from Electrochemistry. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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2022-2026
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Last 5 Years Electrochemistry Questions
Showing 50 of 175 filtered questions.
1Electrochemistry
What is degree of dissociation of $\mathrm{CH}_3 \mathrm{COOH}$ if, $\wedge^{\circ}\left(\mathrm{CH}_3 \mathrm{COO}^{-}\right)=50 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$, $\wedge^{\circ}\left(\mathrm{H}^{+}\right)=350 \mathrm{~S} \ma...
MCQ+1 / -02025
2Electrochemistry
What is the SI unit of resistivity?
MCQ+1 / -02025
3Electrochemistry
For the cell reaction, $\mathrm{A}_{(\mathrm{s})}+\mathrm{B}_{(\mathrm{eq})}^{+_2} \longrightarrow \mathrm{~A}_{(\mathrm{eq})}^{+_2}+\mathrm{B}_{(\mathrm{s})}$ if equilibrium constant of reaction is $10^4$ at 298 K . What is standard emf of...
MCQ+1 / -02025
4Electrochemistry
If $\mathrm{E}^{-}\left(\mathrm{Cu}_{(a q)}^{+2} \mid \mathrm{Cu}_{(s)}\right)=+0.34 \mathrm{~V}$. What is potential for $\mathrm{Cu}_{(s)} \rightarrow \mathrm{Cu}_{(\mathrm{aq})}^{+2}(0.1 \mathrm{M})+2 \mathrm{e}^{-}$at 298 K ?
MCQ+1 / -02025
5Electrochemistry
Which of the following changes takes place at positive electrode during recharging of lead accumulator?
MCQ+1 / -02025
6Electrochemistry
What happens to the emf for the cell, $\mathrm{Zn}_{(\mathrm{s})}\left|\mathrm{Zn}_{(1 \mathrm{M})}^{+2} \| \mathrm{Ag}^{+1}(1 \mathrm{M})\right| \mathrm{Ag}_{(\mathrm{s})}^{+}$if concentration of $\mathrm{Ag}^{+1}$ decreases to 0.1 M ?
MCQ+1 / -02025
7Electrochemistry
What is reduction potential of hydrogen gas electrode when pure hydrogen gas is at I atmospheric pressure and platinum electrode is in contact with HCl solution of pH 1 at 298 K ?
MCQ+1 / -02025
8Electrochemistry
Which of the following net cell reaction takes place in a galvanic cell containing copper electrode and standard hydrogen electrode?
$$ \mathrm{E}^{o}\left(\mathrm{Cu}_{(\mathrm{aq})}^{+2} \mid \mathrm{Cu}_{(\mathrm{s})}\right)=+0.34 \mathr...
$$ \mathrm{E}^{o}\left(\mathrm{Cu}_{(\mathrm{aq})}^{+2} \mid \mathrm{Cu}_{(\mathrm{s})}\right)=+0.34 \mathr...
MCQ+1 / -02025
9Electrochemistry
For the cell involving following reaction.
\(\mathrm{Zn}_{(\mathrm{s})}+\mathrm{Ni}_{(\mathrm{aq})}^{+2} \longrightarrow \mathrm{Zn}_{(\mathrm{aq})}^{+2}+\mathrm{Ni}_{(\mathrm{s})}, \mathrm{E}_{\mathrm{cell}}^*=0.5 \mathrm{~V} .\)
What is...
\(\mathrm{Zn}_{(\mathrm{s})}+\mathrm{Ni}_{(\mathrm{aq})}^{+2} \longrightarrow \mathrm{Zn}_{(\mathrm{aq})}^{+2}+\mathrm{Ni}_{(\mathrm{s})}, \mathrm{E}_{\mathrm{cell}}^*=0.5 \mathrm{~V} .\)
What is...
MCQ+1 / -02025
10Electrochemistry
If $\mathrm{E}^{\circ}\left(\mathrm{Zn}_{(\mathrm{aq})}^{+2} \mid \mathrm{Zn}_{(\mathrm{s})}\right)=-0.76 \mathrm{~V}$.
Calculate potential for $\mathrm{Zn}_{(\mathrm{s})} \rightarrow \mathrm{Zn}^{+2}(0.01 \mathrm{M})+2 \mathrm{e}^{-}$at 29...
Calculate potential for $\mathrm{Zn}_{(\mathrm{s})} \rightarrow \mathrm{Zn}^{+2}(0.01 \mathrm{M})+2 \mathrm{e}^{-}$at 29...
MCQ+1 / -02025
11Electrochemistry
If standard reduction potential $\left(\mathrm{E}^{\circ}\right)$ of $\left(\mathrm{Mg}_{(\mathrm{aq})}^{+2} \mid \mathrm{Mg}_{(\mathrm{s})}\right),\left(\mathrm{Ag}_{(\mathrm{aq})}^{+} \mid \mathrm{Ag}_{(\mathrm{s})}\right),\left(\mathrm{Z...
MCQ+1 / -02025
12Electrochemistry
What is molar conductivity at zero concentration in $\Omega^{-1} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$ for aluminium sulphate, if molar ionic conductivities at zero concentration of $\mathrm{Al}^{+3}$ and $\mathrm{SO}_4^{-2}$ are $189 \Omega^{...
MCQ+1 / -02025
13Electrochemistry
What is value of $E_{\text {cell }}$ at 298 K for the reaction, $\mathrm{Zn}_{(\mathrm{s})}+\mathrm{Cu}^{+2}(0.1 \mathrm{M}) \longrightarrow \mathrm{Zn}^{+2}(0.1 \mathrm{M})+\mathrm{Cu}_{(\mathrm{s})}$ if $\mathrm{E}_{\text {cell }}^{\circ}...
MCQ+1 / -02025
14Electrochemistry
Consider galvanic cell, ${ }^{\ominus} \mathrm{A}_{(\mathrm{s})}\left|\mathrm{A}_{(\mathrm{aq})}^{+2}\right|\left|\mathrm{B}_{(\mathrm{aq})}^{+}\right| \mathrm{B}_{(\mathrm{s})}^{\oplus}$
if emf of cell is positive, identify a correct cell ...
if emf of cell is positive, identify a correct cell ...
MCQ+1 / -02025
15Electrochemistry
Standard potential of electrode reaction $\mathrm{Cu}_{(\mathrm{aq})}^{+2}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Cu}_{(\mathrm{s})}$ is +0.34 V .
What is standard potential of reaction
$$ 2 \mathrm{Cu}_{(\mathrm{s})} \longrightarrow 2 \m...
What is standard potential of reaction
$$ 2 \mathrm{Cu}_{(\mathrm{s})} \longrightarrow 2 \m...
MCQ+1 / -02025
16Electrochemistry
A hypothetical galvanic cell is ${ }^{\ominus} \mathrm{A}_{(\mathrm{s})} \mid \stackrel{+}{\mathrm{A}}(1 \mathrm{M})\|\stackrel{+2}{\mathrm{~B}}(1 \mathrm{M})\| \stackrel{\oplus}{\mathrm{B}}_{(\mathrm{s})}$ and emf of cell is positive. What...
MCQ+1 / -02025
17Electrochemistry
Which from following statements is true regarding the cell emf at 298 K for
${ }^{\ominus} \mathrm{Ni}_{(s)}|\stackrel{+2}{\mathrm{~N}} \mathrm{i}(0.01 \mathrm{M}) \| \stackrel{+}{\mathrm{Ag}}(0.01 \mathrm{M})| \stackrel{\oplus}{\mathrm{Ag}...
${ }^{\ominus} \mathrm{Ni}_{(s)}|\stackrel{+2}{\mathrm{~N}} \mathrm{i}(0.01 \mathrm{M}) \| \stackrel{+}{\mathrm{Ag}}(0.01 \mathrm{M})| \stackrel{\oplus}{\mathrm{Ag}...
MCQ+1 / -02025
18Electrochemistry
The standard emf for cell, ${ }^{\ominus} \mathrm{Cd}_{(\mathrm{s})}\left|{ }^{+2} \mathrm{Cd}(1 \mathrm{M}) \| \stackrel{+2}{\mathrm{Cu}}(1 \mathrm{M})\right| \mathrm{Cu}_{(\mathrm{s})}{ }^{\oplus}$ is 0.74 V .
If concentration of $\mathrm...
If concentration of $\mathrm...
MCQ+1 / -02025
19Electrochemistry
If $\mathrm{E}^{\cdot}\left(\mathrm{Mg}_{(\mathrm{aq})}^{+2} \mid \mathrm{Mg}_{(\mathrm{s})}\right)=-2.37 \mathrm{~V}$. What is potential for $\mathrm{Mg}_{(\mathrm{s})} \longrightarrow \mathrm{Mg}^{+2}(0.01 \mathrm{M})+2 \mathrm{e}^{-}$at ...
MCQ+1 / -02025
20Electrochemistry
Which of the following reactions exhibit minimum standard reduction potential?
MCQ+1 / -02025
21Electrochemistry
If standard reduction potential $\left(E^{\circ}\right)$ of $\left(\mathrm{Ni}_{(\mathrm{aq})}^{+2} \mid \mathrm{Ni}_{(\mathrm{s})}\right)$ and $\left(\mathrm{Al}_{(\mathrm{aq})}^{+3} \mid \mathrm{Al}_{(\mathrm{s})}\right)$ are -0.25 V and ...
MCQ+1 / -02025
22Electrochemistry
If $\mathrm{E}^o{}\left(\mathrm{AI}_{(\mathrm{eq})}^{+3} \mid \mathrm{AI}_{(\mathrm{s})}\right)=-1.66 \mathrm{~V}$. What is potential of $\mathrm{Al}_{(\mathrm{s})} \longrightarrow \mathrm{Al}^{+3}(0 \cdot 1 \mathrm{M})+3 \mathrm{e}^{-}$at ...
MCQ+1 / -02025
23Electrochemistry
$$ \begin{aligned} & \text { If } \mathrm{E}^{\circ}\left(\mathrm{Fe}_{(\mathrm{aq})}^{+2} \mid \mathrm{Fe}_{(\mathrm{s})}\right)=-0.44 \mathrm{~V} \text { and } \\ & \mathrm{E}^{\circ}\left(\mathrm{Sn}_{(\mathrm{aq})}^{+2} \mid \mathrm{Sn}...
MCQ+1 / -02025
24Electrochemistry
Select false statement from the following regarding electrochemical cell.
MCQ+1 / -02025
25Electrochemistry
If $\mathrm{E}^*\left(\mathrm{Mg}^{+2}{ }_{(\mathrm{aq})} \mid \mathrm{Mg}_{(\mathrm{s})}\right)=-2.37 \mathrm{~V}$.
What is potential for $\mathrm{Mg}_{(\mathrm{s})} \rightarrow \mathrm{Mg}^{+2}(0.1 \mathrm{M})+2 \mathrm{e^-}$ at 298 K ?
What is potential for $\mathrm{Mg}_{(\mathrm{s})} \rightarrow \mathrm{Mg}^{+2}(0.1 \mathrm{M})+2 \mathrm{e^-}$ at 298 K ?
MCQ+1 / -02025
26Electrochemistry
If standard emf of cell $\mathrm{Zn}_{(\mathrm{s})}\left|\mathrm{Zn}_{(\mathrm{iM})}^{+2}\right| \mathrm{Ag}_{(\mathrm{iM})}^{+1} \mid \mathrm{Ag}_{(\mathrm{s})}$ is 1.55 V .
What is electrical work done under standard conditions?
What is electrical work done under standard conditions?
MCQ+1 / -02025
27Electrochemistry
If $\mathrm{E}^{\circ}\left(\mathrm{Ag}^{+}{ }_{(\mathrm{aq})} \mid \mathrm{Ag}_{(\mathrm{s})}\right)=+0.80 \mathrm{~V}$ What is potential developed for $\mathrm{Ag}_{(\mathrm{s})} \longrightarrow \mathrm{Ag}^{+1}(0.01 \mathrm{M})+\mathrm{e...
MCQ+1 / -02025
28Electrochemistry
For cell reaction,
\(2 \mathrm{Al}_{(\mathrm{s})}+3 \mathrm{Cu}_{(\mathrm{aq})}^{+2} \longrightarrow 2 \mathrm{Al}_{(\mathrm{aq})}^{+3}+3 \mathrm{Cu}_{(\mathrm{s})}\)
If $\Delta \mathrm{G}^{\circ}=-1158 \mathrm{~kJ}$, what is $\mathrm{E}_...
\(2 \mathrm{Al}_{(\mathrm{s})}+3 \mathrm{Cu}_{(\mathrm{aq})}^{+2} \longrightarrow 2 \mathrm{Al}_{(\mathrm{aq})}^{+3}+3 \mathrm{Cu}_{(\mathrm{s})}\)
If $\Delta \mathrm{G}^{\circ}=-1158 \mathrm{~kJ}$, what is $\mathrm{E}_...
MCQ+1 / -02025
29Electrochemistry
Which of the following relations about $\mathrm{E}_{\text {cell }}^{\circ}$ is false?
MCQ+1 / -02025
30Electrochemistry
Standard potential $\left(\mathrm{E}^{\circ}\right)$ of $\mathrm{Zn}_{(\mathrm{aq})}^{+2}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Zn}_{(\mathrm{s})}$ is -0.76 V .
What is standard potential of reaction $2 \mathrm{Zn}_{(\mathrm{s})} \longri...
What is standard potential of reaction $2 \mathrm{Zn}_{(\mathrm{s})} \longri...
MCQ+1 / -02025
31Electrochemistry
Which from following formulae is used to obtain value of $\mathrm{E}_{\text {cell }}^r$ for a reaction taking place in Dry cell?
MCQ+1 / -02025
32Electrochemistry
Which of the following species acts as reducing agent during working of hydrogen-oxygen fuel cell?
MCQ+1 / -02025
33Electrochemistry
Which from following statement is correct regarding emf of cell for the cell reaction,
\(\mathrm{Cd}_{(\mathrm{s})}+\mathrm{Cu}_{(\mathrm{aq})}^{+2} \longrightarrow \mathrm{Cd}_{(\mathrm{aq})}^{+2}+\mathrm{Cu}_{(\mathrm{s})}\)
if concentr...
\(\mathrm{Cd}_{(\mathrm{s})}+\mathrm{Cu}_{(\mathrm{aq})}^{+2} \longrightarrow \mathrm{Cd}_{(\mathrm{aq})}^{+2}+\mathrm{Cu}_{(\mathrm{s})}\)
if concentr...
MCQ+1 / -02025
34Electrochemistry
Assume the cell reaction,
\(\mathrm{A}_{(\mathrm{s})}+\mathrm{B}_{(\mathrm{aq})}^{+2} \longrightarrow \mathrm{~A}_{(\mathrm{aq})}^{+2}+\mathrm{B}_{(\mathrm{s})}\)
if $\Delta \mathrm{G}^{\circ}=-386 \mathrm{~kJ}$ at 298 K . What is $\mathr...
\(\mathrm{A}_{(\mathrm{s})}+\mathrm{B}_{(\mathrm{aq})}^{+2} \longrightarrow \mathrm{~A}_{(\mathrm{aq})}^{+2}+\mathrm{B}_{(\mathrm{s})}\)
if $\Delta \mathrm{G}^{\circ}=-386 \mathrm{~kJ}$ at 298 K . What is $\mathr...
MCQ+1 / -02025
35Electrochemistry
Which of the following change takes place at positive electrode during working of dry cell?
MCQ+1 / -02025
36Electrochemistry
Which from following is the correct relationship between molar conductivity $(\Lambda)$, conductivity $(\mathrm{k})$ and molarity (M) of solution for electrolyte?
MCQ+1 / -02025
37Electrochemistry
How long should aqueous NaCl be electrolysed by passing 100 ampere current, so that 0.5 mol chlorine is released at anode?
MCQ+1 / -02025
38Electrochemistry
For the cell reaction,
\(\mathrm{Zn}_{(\mathrm{s})}+2 \mathrm{Ag}_{(\mathrm{aq})}^{+} \longrightarrow \mathrm{Zn}_{(\mathrm{aq})}^{+2}+2 \mathrm{Ag}_{(\mathrm{s})}\)
Cell potential is less than $\mathrm{E}_{\text {cell }}^{\circ}$ by 0.059...
\(\mathrm{Zn}_{(\mathrm{s})}+2 \mathrm{Ag}_{(\mathrm{aq})}^{+} \longrightarrow \mathrm{Zn}_{(\mathrm{aq})}^{+2}+2 \mathrm{Ag}_{(\mathrm{s})}\)
Cell potential is less than $\mathrm{E}_{\text {cell }}^{\circ}$ by 0.059...
MCQ+1 / -02025
39Electrochemistry
What is the number of faraday required to form $1 \mathrm{~mol} \mathrm{H}_2$ by reduction of $\mathrm{H}^{+}$ions?
MCQ+1 / -02025
40Electrochemistry
For a Galvanic cell consisting zinc electrode and standard hydrogen electrode,
\(\mathrm{E}^{\mathrm{o}}\left(\mathrm{Zn}_{(\mathrm{aq})}^{+2} \mid \mathrm{Zn}_{(\mathrm{s})}\right)=-0.76 \mathrm{~V}\)
Identify the reaction that takes pla...
\(\mathrm{E}^{\mathrm{o}}\left(\mathrm{Zn}_{(\mathrm{aq})}^{+2} \mid \mathrm{Zn}_{(\mathrm{s})}\right)=-0.76 \mathrm{~V}\)
Identify the reaction that takes pla...
MCQ+1 / -02025
41Electrochemistry
For the cell,
${ }^{\ominus} \mathrm{Zn}_{(\mathrm{s})}\left|\mathrm{Zn}^{+2}(1 \mathrm{M})\right|\left|\mathrm{Ag}^{+1}(1 \mathrm{M})\right| \mathrm{Ag}_{(\mathrm{s})}{ }^{\oplus}$
If concentration of $\mathrm{Zn}^{+2}$ decreases to 0.1 M ...
${ }^{\ominus} \mathrm{Zn}_{(\mathrm{s})}\left|\mathrm{Zn}^{+2}(1 \mathrm{M})\right|\left|\mathrm{Ag}^{+1}(1 \mathrm{M})\right| \mathrm{Ag}_{(\mathrm{s})}{ }^{\oplus}$
If concentration of $\mathrm{Zn}^{+2}$ decreases to 0.1 M ...
MCQ+1 / -02025
42Electrochemistry
For which electrolyte the molar conductivity at infinite dilution can not be obtained graphically?
MCQ+1 / -02024
43Electrochemistry
What volume of chlorine gas (molar mass 71) is evolved at STP during electrolysis of fused NaCl by passage of 1 amp current for 965 second? (At STP, V $=22.4 \mathrm{~dm}^3$ )
MCQ+1 / -02024
44Electrochemistry
Which of the following is used to avoid leakage of electrolyte in dry cell?
MCQ+1 / -02024
45Electrochemistry
What is the quantity of electricity required to produce 4.8 g of Mg (molar mass $=24 \mathrm{~g} \mathrm{~mol}^{-1}$ ) from its salt solution?
MCQ+1 / -02024
46Electrochemistry
Resistance and conductivity of a cell containing 0.1 M KCl solution at 298 K are 115 ohm and $1.90 \times 10^{-6} \mathrm{~S} \mathrm{~cm}^{-1}$ respectively. What is the value of cell constant?
MCQ+1 / -02024
47Electrochemistry
The conductivity of 0.005 M NaI solution at $25^{\circ} \mathrm{C}$ is $6.07 \times 10^{-4} \Omega^{-1} \mathrm{~cm}^{-1}$. Calculate its molar conductivity
MCQ+1 / -02024
48Electrochemistry
Calculate the amount of electricity required in coulombs to convert 0.08 mol of $\mathrm{MnO}_4^{-}$to $\mathrm{Mn}^{2+}$.
MCQ+1 / -02024
49Electrochemistry
Which of the following reactions occurs at cathode during discharging of lead accumulator?
MCQ+1 / -02024
50Electrochemistry
What is the conductivity of $0.02 \mathrm{~M} \mathrm{~AgNO}_3$ solution having cell constant $1.1 \mathrm{~cm}^{-1}$ and resistance is 94.5 ohms?
MCQ+1 / -02024