Electrochemistry Test

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Electrochemistry Test - 21

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Weekly Quiz Competition

Question 1
4 / -1

Small quantities of solutions of compounds TX , TY and TZ are put into separate test tubes containing X ,Y and Z solutions. TX does not react with any of these. TY reacts with both X and Z. TZ reacts with X. The decreasing order of ease of oxidation of the anions X^-, Y^-, Z^- is

A
Y^-, Z^-, X^-

B
Z^-, X^-, Y^-

C
Y^-, X^-, Z^-

D
X^-, Z^-, Y^-
Question 2
4 / -1

A
0.26 V

B
0.399 V

C
-0.339 V

D
-0.26 V
Question 3
4 / -1

The standard reduction potentials at 298 K for the following half-cell reactions are given
Zn²⁺ (aq) + 2e^- ⇌ Zn(s); -0.762 V
Cr³⁺ (aq) + 3e^- ⇌ Cr(s); -0.74 V
2H⁺ (aq) + 2e^- ⇌ H₂ (g); +0.00 V
Fe³⁺ (aq) + e^- ⇌ Fe²⁺ (aq); +0.77 V
Which one of the following is the strongest reducing agent ?

A
Zn(s)

B
Cr(s)

C
H₂(s)

D
Fe²⁺ (aq)
Question 4
4 / -1

Electrode potential of hydrogen electrode is...volt.

A
0

B
+1

C
-1

D
None of these
Question 5
4 / -1

The relationship between Gibbs' free energy change (∆G) and emf(E)of a reversible electrochemical cell is given by

A
∆G = nFE

B
∆G = nF/E

C
∆G = - nFE

D
∆G = E/nF
Question 6
4 / -1

Zn²⁺ → Zn(s); E^o = -0.76 V;
Cu²⁺ → Cu(s); E^o = -0.34 V
Which of the following is spontaneous?

A
Zn²⁺ + Cu → Zn + Cu²⁺

B
Cu²⁺ + Zn → Cu + Zn²⁺

C
Zn²⁺ + Cu²⁺ → Zn + Cu

D
None of these
Question 7
4 / -1

The cell, Zn | Zn²⁺ (1 M) || Cu²⁺ (1 M) | Cu (E^o_cell = 1.10V), was allowed to be completely discharged at 298 K. The relative concentration of Zn²⁺to

A
antilog (24.08)

B
antilog (37.3)

C
10^37.3

D
9.65 × 10⁴

Solution
Question 8
4 / -1

Given standard electrode potentials
Fe²⁺ + 2e^- → Fe E^o = - 0.440V
Fe³⁺ + 3e^- → Fe E^o = - 0.036 V
the standard electrode potential (E^o) for
Fe³⁺ + e^- → Fe²⁺ is

A
+0.722 V

B
-0.772 V

C
+0.417 V

D
-0.414 V

Solution
Question 9
4 / -1

The standard E^o_red values of A, B and C are + 0.68 V, - 2.54 V, - 0.50 V respectively. The order of their reducing power is

A
A > B > C

B
A > C > B

C
C > B > A

D
B > C > A
Question 10
4 / -1

EMF of hydrogen electrode in term of pH is (at 1 atm pressure)

A

B

C

D

Solution