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Chemistry M.C.Q [1M]

Electro Chemistry · Bihar Board (BSEB) STD 12 Science (BSEB - English Medium). 30 questions.

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M.C.Q [1M]

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30 questions · timed · auto-graded

MCQ 11 Mark
The electromotive force of the cell Zn | $ZnSO_{4}$ || $CuSO_{4}$ | Cu is 1.1 volt. Its cathode is:
  • A
    Zn
  • ✓
    Cu
  • C
    $ZnSO_{4}$
  • D
    $CuSO_{4}$
Answer
Correct option: B.
Cu
B
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MCQ 21 Mark
The cell constant of a conductivity cell is:
  • ✓
    $\frac{l}{A}$
  • B
    $\frac{A}{l}$
  • C
    l.A
  • D
    $\frac{R}{A}$
Answer
Correct option: A.
$\frac{l}{A}$
A
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MCQ 31 Mark
The best way to protect iron from rusting is:
  • ✓
    Making iron cathode
  • B
    Putting it in saline water
  • C
    (a) and (b) both
  • D
    None of these
Answer
Correct option: A.
Making iron cathode
A
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MCQ 41 Mark
Faraday's second law of electrolysis are related to:
  • A
    Atomic number of cation
  • B
    Atomic number of anion
  • ✓
    Equivalent weight of electrolyte
  • D
    Speed of Cation
Answer
Correct option: C.
Equivalent weight of electrolyte
C
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MCQ 51 Mark
How much charge is required for reduction of 1 mole of $Al^{3+}$ to Al?
  • ✓
    $3.0 \times 10^{5} C$
  • B
    $28.95 \times 10^{5} C$
  • C
    $289.5 \times 10^{5} C$
  • D
    $2895 \times 10^{5} C$
Answer
Correct option: A.
$3.0 \times 10^{5} C$
A
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MCQ 61 Mark
The Electromotive force (EMF) of the cell for the cell reaction at equilibrium state is:
  • A
    Positive
  • ✓
    Zero
  • C
    Negative
  • D
    None of these
Answer
Correct option: B.
Zero
B
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MCQ 71 Mark
The standard reduction potential values of elements A, B and C are + 0.68 V, -2.50 V and -0.50 V respectively. The order of their reducing power is:
  • A
    $A > B > C$
  • B
    $A > C > B$
  • C
    $C > B > A$
  • ✓
    $B > C > A$
Answer
Correct option: D.
$B > C > A$
D
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MCQ 81 Mark
In galvanic cell anode is:
  • ✓
    Negative electrode
  • B
    Positive electrode
  • C
    Neutral electrode
  • D
    none of these
Answer
Correct option: A.
Negative electrode
A
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MCQ 91 Mark
Zn (s) | $Zn^{2+}$ (aq) || $Cu^{2+}$ (aq) | Cu (s) is:
  • A
    Weston cell
  • B
    Daniell cell
  • C
    Colomal cell
  • ✓
    Standard cell
Answer
Correct option: D.
Standard cell
D
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MCQ 101 Mark
One Faraday electricity is equal to how much Coulombs?
  • A
    96550
  • ✓
    96500
  • C
    96000
  • D
    95500
Answer
Correct option: B.
96500
B
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MCQ 111 Mark
A dilute aqueous solution of sodium fluoride is electrolysed; the products at the anode an cathode are:
  • A
    $F_{2}$, Na
  • B
    $F_{2}, H_{2}$
  • C
    $O_{2}$, Na
  • ✓
    $O_{2}, H_{2}$
Answer
Correct option: D.
$O_{2}, H_{2}$
D
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MCQ 121 Mark
The correct order of equivalent conductance at infinite dilution of LiCl, NaCl and KCl is:
  • A
    $LiCl > NaCl > KCl$
  • ✓
    $KCl > NaCl > LiCl$
  • C
    $NaCl > KCl > LiCl$
  • D
    $LiCl > KCl > NaCl$
Answer
Correct option: B.
$KCl > NaCl > LiCl$
B
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MCQ 131 Mark
The second law of Faraday is related to:
  • A
    Atomic no. of cation
  • B
    Equivalent weight of electrolyte
  • C
    Atomic no. of anion
  • ✓
    Velocity of cations
Answer
Correct option: D.
Velocity of cations
D
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MCQ 141 Mark
A charge of 96500 Coulomb liberates __________ from the solution of $CuSO_{4}$:
  • A
    63.5 gm Copper
  • ✓
    31.76 gm Copper
  • C
    96500 gm Copper
  • D
    100 gm Copper
Answer
Correct option: B.
31.76 gm Copper
B
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MCQ 151 Mark
Which of the following aqueous solution has highest electrical conductivity?
  • A
    Acetic acid
  • B
    Chloroacetic acid
  • C
    Fluoroacetic acid
  • ✓
    Difluoroacetic acid
Answer
Correct option: D.
Difluoroacetic acid
D
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MCQ 161 Mark
The order of equivalent conductivity of LiCl, NaCl and KCl at infinite dilution is:
  • A
    $LiCl > NaCl > KCl$
  • ✓
    $KCl > NaCl > LiCl$
  • C
    $NaCl > KCl > LiCl$
  • D
    $LiCl > KCl > NaCl$
Answer
Correct option: B.
$KCl > NaCl > LiCl$
B
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MCQ 171 Mark
In the electrolytic cell, flow of electron is from:
  • A
    Cathode to anode in the solution
  • B
    Cathode to anode through external supply
  • ✓
    Cathode to anode through internal supply
  • D
    Anode to cathode through internal supply
Answer
Correct option: C.
Cathode to anode through internal supply
C
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MCQ 181 Mark
Fused sodium chloride on electrolysis gives on cathode is:
  • A
    Chlorine
  • ✓
    Sodium
  • C
    Sodium amalgam
  • D
    Hydrogen
Answer
Correct option: B.
Sodium
B
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MCQ 191 Mark
For a spontaneous reaction, $\Delta G$ equilibrium constant K and $E_{cell}^{0}$ will be respectively:
  • ✓
    $- ve ,>1,+ ve$
  • B
    $+ ve ,>1,- ve$
  • C
    $- ve ,<1,- ve$
  • D
    $- ve ,>1,- ve$
Answer
Correct option: A.
$- ve ,>1,+ ve$
A
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MCQ 201 Mark
$Zn_{(s)} + 2H_{(aq)}^{+} \rightarrow Zn_{(aq)}^{2+} + H_{2(g)}$ reaction utilizes in this above cell. Addition of $H_{2}SO_{4}$ to the cathode compartment will:
  • A
    Decrease the E and equilibrium shift to the right
  • B
    Decrease the E and equilibrium shift to the left
  • C
    Increase the E and equilibrium shift to the left
  • ✓
    Increase the E and equilibrium shift to the right
Answer
Correct option: D.
Increase the E and equilibrium shift to the right
D
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MCQ 221 Mark
Which of the following statement is true for electro-chemical Daniell cell?
  • A
    Electrons flows from copper electrode to zinc electrode
  • B
    Current flows from zinc electrode to copper electrode
  • ✓
    Cations move towards copper electrode
  • D
    Cations move towards zinc electrode
Answer
Correct option: C.
Cations move towards copper electrode
C
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MCQ 231 Mark
Which of the following is a secondary cell?
  • A
    Lacklanche cell
  • ✓
    Lead storage battery
  • C
    Concentration cell
  • D
    All of these
Answer
Correct option: B.
Lead storage battery
B
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MCQ 241 Mark
When 2A of current is passed through molten metal salt in 5 h is 22.2 g of metal is deposited. What will be the oxidation number of metal?
  • A
    $+ 1$
  • ✓
    $+2$
  • C
    $+3$
  • D
    $+4$
Answer
Correct option: B.
$+2$
B
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MCQ 251 Mark
Time to required to deposit one millimole of aluminium metal by the passage of 9.65 ampere electric current through aqueous solution of aluminium is:
  • ✓
    30 s
  • B
    10 s
  • C
    30,000 s
  • D
    10,000 s
Answer
Correct option: A.
30 s
A
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MCQ 261 Mark
The standard electrode potentials for the half cell reactions are :
$Zn \rightarrow Zn ^{2+}+2 e ;$ $\quad$$E ^0=+0.76 V$
$Fe \rightarrow Fe ^{2+}+2 e$$\quad$$E ^0=-+0.41 V$
The EMF of the cell reaction is :
  • A
    $-0.35 V$
  • ✓
    $+0.35 V$
  • C
    $-1.17 V$
  • D
    $+1.17 V$
Answer
Correct option: B.
$+0.35 V$
B
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MCQ 271 Mark
Molar and ionic conductivities of bivalent electrolyte are 57 and 73 respectively. The molar conductivity of solution will be:
  • ✓
    $130~s~cm^{2}mol^{-1}$
  • B
    $65~s~cm^{2}mol^{-1}$
  • C
    $260~s~cm^{2}mol^{-1}$
  • D
    $187~s~cm^{2}mol^{-1}$
Answer
Correct option: A.
$130~s~cm^{2}mol^{-1}$
A
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MCQ 281 Mark
Which of the following is the strongest oxidising agent?
  • ✓
    $F_{2}$
  • B
    $Cl_{2}$
  • C
    $I_{2}$
  • D
    $Br_{2}$
Answer
Correct option: A.
$F_{2}$
A
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MCQ 291 Mark
In the electrolysis of dil. $H_{2}SO_{4}$, what is librated at anode?
  • A
    $H_{2}$
  • B
    $SO_{4}^{2-}$
  • C
    $SO_{2}$
  • ✓
    $O_{2}$
Answer
Correct option: D.
$O_{2}$
D
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MCQ 301 Mark
Saturated solution of $KNO_{3}$ is used to make 'salt bridge', because:
  • A
    Velocity of $K ^{+}$is greater than $NO _3^{-}$
  • B
    Velocity of $NO_{3}^{-}$ is greater than $K^{+}$
  • ✓
    Velocity of both $K ^{+}$and $NO _3^{-}$are approximate the same
  • D
    $KNO _3$ is highly soluble in water
Answer
Correct option: C.
Velocity of both $K ^{+}$and $NO _3^{-}$are approximate the same
C
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