Electrochemistry Test

Result

Electrochemistry Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Hydrogen gas is not liberated when the following metal is added to dil. HCl.

A
Sn

B
Mg

C
Zn

D
Ag

Solution

Ag is less reactive than Hydrogen.
Question 2
1 / -0

The hydrogen electrode is dipped in a solution of pH 3 at 25°C. The potential would be (the value of 2.303 RT/F is 0.059 V)

A
0.059 V

B
0.087 V

C
0.177 V

D
-0.177 V

Solution

2H⁺ + 2e^- = H₂
E_cell = -0.0591 log(P_H2/[H +]²)
Question 3
1 / -0

The one which decreases with dilution is

A
molar conductance

B
specific conductance

C
conductance

D
equivalent conductance

Solution

Specific conductance decreases with dilution as number of ions decreases per unit volume.
Question 4
1 / -0

The standard electrode potential for the half cell reactions are

Zn⁺⁺+ 2e⁻→ Zn, E⁰ = -0.76V

Fe⁺⁺+ 2e⁻→ Fe, E⁰ = -0.44V

The e.m.f. of the cell reaction Fe⁺⁺+ Zn→ Zn⁺⁺ + Fe is

A
+ 0.32 V

B
+1.20 V

C
-1.20 V

D
–0.32 V

Solution

E⁰ cell = E⁰cathode - E⁰anode

= -0.44 - (-0.76) = +0.32V
Question 5
1 / -0
Given
1. Cu²⁺ + 2e^- →→ Cu, E⁰ = 0.337 V
2. Cu²⁺ + e^- →→ Cu⁺, E⁰ = 0.153 V
  Electrode potential E° for the reaction Cu²⁺ + e^- → Cu will be
A
0.30 V

B
0.52 V

C
0.38 V

D
0.90 V

Solution

E^ocell = 2(0.337)-0.153