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Electrochemistry Chemistry - Electrochemistry

Bihar Board (BSEB) - STD 12 Science - Chemistry (BSEB - English Medium). 130 questions in this chapter.

Question types

Electrochemistry question types

130 questions across 7 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

130
Questions
7
Question groups
5
Question types
Sample Questions

Electrochemistry questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 2M.C.Q [1M]1 Mark
If the concentration of $Zn ^{+2}$ and $Cu ^{+2}$ ions in Daniell cell is one unit ( 1 mole $dm ^{-3}$ ), then the value of electric potential will be :
  • A
    0.00 V
  • ✓
    1.10 V
  • C
    1.35 V
  • D
    2.00 V

Answer: B.

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Q 3M.C.Q [1M]1 Mark
The standard electrode potential values of three metallic cations $X , Y , Z$ are, $0.52 V,-3.03 V$ and -1.18 V respectively. The order of reducing ability of corresponding metal is :
  • ✓
    Y $>$ Z $>$ X
  • B
    $X >$ Y $>$ Z
  • C
    $Z>Y>X$
  • D
    $Z>X>Y$

Answer: A.

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Q 4M.C.Q [1M]1 Mark
The reaction
$
\frac{1}{2} H_{2(g)}+AgCl_{(aq)} \rightleftharpoons H_{(aq)}^{+}+Cl_{(aq)}^{-}+Ag_{(s)}
$ takes place in a galvanic cell. Its correct representation is :
  • A
    $Ag / AgCl _{\text {(s) }} / KCl _{( aq )} / / AgNO _{3( aq )} / Ag _{\text {(s) }}$
  • B
    $Pt , H _{2(g)} / HCl _{( aq )} / / AgNO _{3( aq } / Ag _{( s )}$
  • ✓
    $Pt , H _{2(g)} / HCl _{\text {(aq) }} / / AgCl _{( aq )} / Ag _{\text {(s) }}$
  • D
    $Pt , H _{2(g} / KCl _{\text {(qq })} / / AgCl _{\text {(s) }} / Ag$

Answer: C.

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Q 5M.C.Q [1M]1 Mark
If the cell reaction is spontaneous, then :
  • A
    $E ^{\circ}=- ve$
  • B
    $E ^{\circ}=+ ve$
  • ✓
    $emf =+ ve$
  • D
    $\left(\Delta G + E ^{\circ}\right)=+ ve$

Answer: C.

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Q 17Short Answer Type Questions [2M]2 Marks
Given the standard electrode potentials,
$\begin{array}{l} K ^{+} / K =-2.93 V, Ag ^{+} / Ag =0.80 V \\ Hg ^{2+} / Hg =0.79 V \\ Mg ^{2+} / Mg =-2.37 V, Cr ^{3+} / Cr =-0.74 V\end{array}$
Arrange these metals in their increasing order of reducing power.
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Q 213 Marks Question3 Marks
In the button cells widely used in watches and other devices the following reaction takes place :
$Zn _{( s )}+ Ag _2 O _{( s )}+ H _2 O _{( l )} \rightarrow Zn _{( aq )}^{2+}+2 Ag _{( s )}+2 OH _{( aq )}^{-}$
Determine $\Delta_{ r } G ^{\circ}$ and $E ^{\circ}$ for the reaction.
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Q 223 Marks Question3 Marks
Depict the galvanic cell in which the reaction
$Zn ( s )+2 Ag ^{+}( aq ) \rightarrow Zn ^{2+}( aq )+2 Ag ( s )$,
takes place. Further show :
(i) Which of the electrode is negatively charged?
(ii) The carriers of the current in the cell.
(iii) Individual reaction at each electrode.
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Q 233 Marks Question3 Marks
A solution Ni(NO3)2 is electrolysed between platinum electrodes a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode?
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Q 27Long Answer Type Questions [5M]5 Marks
Write the Nernst equation and emf of the following cells at 298 K :
(i) $Mg ( s )\left| Mg ^{2+}(0.001 M )|| Cu ^{2+}(0.0001 M )\right| Cu ( s )$
(ii) $Fe ( s )\left| Fe ^{2+}(0.001 M )|| H ^{+}(1 M )\right| H _2(g)(1 bar ) \mid Pt ( s )$
(iii) $Sn ( s )\left| Sn ^{2+}(0.050 M )||H ^{+}(0.020 M )\right| H _2(g)(1 bar ) \mid Pt ( s )$
(iv) $\operatorname{Pt}( s )|\overline{\operatorname{B}}r(0.010 M )|Br _{2(l)}||H ^{+}(0.030 M )|$ $H _2(g)(1 bar ) \mid Pt ( s )$.
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Q 28Long Answer Type Questions [5M]5 Marks
Calculate the standard cell potentials of galvanic cell in which the following reactions take place :
(i) $2 Cr ( s )+3 Cd ^{2+}( aq ) \rightarrow 2 Cr ^{3+}( aq )+3 Cd ( s )$
(ii) $Fe ^{2+}$ (aq) $+ Ag ^{+}$(aq) $\rightarrow Fe ^{3+}$ (aq) + Ag (s)
Calculate the $\Delta_r G^{\circ}$ and equilibrium constant of the reactions.
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Q 29Long Answer Type Questions [5M]5 Marks
Predict the products of electrolysis in each of the following : 
(i) An aqueous solution of AgNO3 with silver electrodes.
(ii) An aqueous solution of AgNO3 with platinum electrodes.
(iii) An aqueous solution of H2SO4 with platinum electrodes.
(iv) An aqueous solution of CuCl2 with platinum electrodes.
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Q 30Long Answer Type Questions [5M]5 Marks
Three electrolytic cells A, B, C containing solutions of ZnSO4, AgNO3 and CuSO4, respectively are connected in series. A steady current of 1.5 amperes was passed through them until 1.45 g of silver deposited at the cathode of cell B. How long did the current flow? What mass of copper and zinc were deposited?
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Q 324 Marks Questions4 Marks
Conductivity of 0.00241 M acetic acid is $7.896 \times 10^{-5} s cm ^{-1}$. Calculate its molar conductivity. If $\Lambda_m{ }^o$ for acetic acid is 390.5 S cm2 mol-1. What is its dissociation constant?
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