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Electrochemistry Chemistry - Electrochemistry

Gujarat Board (GSEB) - STD 12 Science - Chemistry (GSEB - English Medium). 113 questions in this chapter.

Question types

Electrochemistry question types

113 questions across 6 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

113
Questions
6
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 22 Marks Questions2 Marks
$Fe ^{2+} \rightarrow Fe ^{3+}\left( E ^{\circ}=-0.77 V\right)$ and$Cu \rightarrow Cu ^{2+}\left( E ^{\circ}=-0.34 V\right) On$ the basis of these values, find out whether $Cu ^{2+}$ ion can be reduce by $Fe ^{2+}$ ion or not?
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Q 52 Marks Questions2 Marks
Cell $Z n _{( s )}\left| Z n _{( aq )}^{2+} \| C u _{( aq )}^{+ 2 }\right| C u _{( s )}$. The value of cell potential for $Cu ( s )$ is positive. What conclusion is drawn from this?
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Q 73 Marks Question3 Marks
How much electricity will be required to obtain 1.5 gram on copper in 3 hours in an electrolytic cell of aqueous solution of copper sulphate? (Atomic mass of Cu = 63.5 )
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Q 83 Marks Question3 Marks
In which of the following pairs will more electric current flow and why?
(a) KCl solution $25^{\circ} C$ and KCl solution at $50^{\circ} C$.
(b) $0.2 \quad M \quad CH _3 COOH$ solution and 2 M $CH _3 COOH$ solution.
(c) $NH _4 OH$ solution at $25^{\circ} C$ and at wire at $50^{\circ} C$.
(d) Al wire at $25^{\circ} C$ and Al wire at $50^{\circ} C$.
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Q 111 Marks Question1 Mark
Which of the following will have higher molar conductivity between them : (i) One mole NaCl in 100 ml solution (ii) One mole NaCl in 250 ml solution and why?
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Q 17M.C.Q (1 Marks)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 18M.C.Q (1 Marks)1 Mark
The formula for conductivity of a solution is :
  • A
    $\kappa=\frac{G}{R}$
  • B
    $\kappa=\frac{l}{A}$
  • ✓
    $\kappa=\frac{\text { Cell constant }\left( G ^{\circ}\right)}{( R )}$
  • D
    None of the above.

Answer: C.

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Q 19M.C.Q (1 Marks)1 Mark
Copper can be precipitated with acidic $CuSO _4$ and alkaline $Cu ( CN )_2$. If the same electric current is passed through their solution for the same time, which of the statement is true?
  • A
    Copper deposited from $Cu ( CN )_2$ alkaline copper cyanide will be twice that of acidic $CuSO _4$.
  • B
    The amount of copper deposited from alkaline copper cyanide will be half that of acidic $CuSO _4$.
  • ✓
    Equal amount of copper deposited from both the solutions.
  • D
    All of the above statements are wrong.

Answer: C.

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Q 20M.C.Q (1 Marks)1 Mark
Which statement is not true for galvanic cell?
  • A
    The anode is negatively charged
  • B
    The cathode is positively charged
  • ✓
    Reduction occurs at the anode
  • D
    Reduction takes place at cathode.

Answer: C.

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