The mass of copper deposited from a solution of CuSO4 by passing a current of 5 A for 15 min is (Atomic Wt. of copper = 63.5)
0.3 g
0.5 g
0.7 g
0.9 g
Which of the following is the strongest oxidizing agent?
BrO3-/Br2+ ; Eo = + 1.50
Fe3+/Fe2+ ; Eo = + 0.76
MnO4-/Mn2+ ; Eo = + 1.52
Cr2O72-/Cr3+ ; Eo = + 1.33
For the redox reaction : Zn(s) + Cu2+ (0.1 M) → Zn2+ (1 M) + Cu(s) taking place in a cell, Eo cell is 1.1 volt. Calculate the value of Ecell for the cell?
2.14 volt
1.80 volt
1.07 volt
0.82 volt
Calculate the e.m.f. of a galvanic cell, the cell reaction is Mg(s) + Cu2+(aq) → Cu(s) + Mg2+(aq). If the standard reduction potentials of Mg and Cu are -2.37 V and + 0.34 V?
+ 2.03 V
- 2.03 V
+ 2.71 V
- 2.71 V
If 0.25 g of copper is deposited by a current of 0.2 ampere in 10 minutes, then the electrochemical equivalent of the copper is
0.2
0.02
0.002
0.0002
In which cell, free energy of a chemical reaction is directly converted into electricity?
Fuel cell
Leclanche cell
Concentration cell
Lead storage cell
The current in a given wire is 1.8 A. A charge passed through the wire in 1.36 minutes is
100 C
147 C
247 C
347 C
In which of the following reaction, ozone acts as a reductant?
Ag2O + O3 → 2Ag + 2O2
KNO2 + O3 → KNO3 + O2
PbS + 4O3 → PbSO4 + 4O2
Na3AO3 + O3 → Na3AsO4 + O2
In which of the following reaction, hydrogen is acting as an oxidizing agent?
with S to give H2S
with I2 to give HI
with Li to form LiH
with Cl to give HCl
The amount of mercury deposited by passing 300 C of charge through mercurous sulphate solution is (Take atomic weight of mercury as 200)
0.2 g
0.4 g
0.6 g
0.8 g
