Electrochemistry Test

Result

Electrochemistry Test - 11

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Question 1
1 / -0

In an electrolytic cell, the positive ions migrate towards the cathode and the negative ions migrate towards the anode. If the cathode is pulled out from the cell, then

A
the positive and negative ions move towards anode

B
the negative ions stop moving

C
the negative ions move towards the anode and the positive ions stop moving

D
the positive and the negative ions start moving randomly

Solution

If one electrode is removed, the circuit is broken and the ions will move randomly. The directional motion of the ions is observed only under the influence of an electric field.
Question 2
1 / -0

An electrochemical cell is represented as:

Pt (H₂, 1 atm) I HCl (0.1 M) II CH₃COOH (0. 1 M) I (H₂, 1 atm) Pt

The EMF of the cell is not zero. This is because

A
the pH of 0.1 M HCl and of 0.1 M CH₃COOH are not the same

B
acids used in the two compartments are different

C
the EMF of a cell depends upon the molarities of acids used

D
the temperature of the cell is constant

Solution

The EMF of the cell will not be zero because HCl and CH₃COOH have different strengths, and they both give different number of H⁺ ions, i.e. both solutions have different pH values.
Question 3
1 / -0

The standard reduction potentials for Zn²⁺/Zn, Ni²⁺/Ni and Fe²⁺/Fe are -0.76 V, -0.23 V and -0.44 V, respectively. The reaction X + Y²⁺ → X²⁺ + Y will be spontaneous when

A
X = Fe, Y = Zn

B
X = Ni, Y = Zn

C
X = Ni, Y = Fe

D
X = Zn, Y = Ni

Solution

Order of elements in the electrochemical series:
Zn, Fe, Ni
Zn can reduce Fe or Ni
So, X = Zn and Y = Ni