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
2H2(g) + O2(g) → 2H2O(I)
2Fe(s) + O2(g) + 4H+(aq) → 2Fe2+(aq) + 2H2O(I)
Pb(s) + PbO2(s) + 2H2SO4(aq) →2PbSO4(s) + 2H2O(I)
Cd(s) + 2Ni(OH)3(s) → CdO(s) + 2Ni(OH)2(s) + H2O(I)
H2O2 is
a catalyst
An oxidizing agent
A reducing agent
Both '2' and '3'
During the electrolysis of a solution of AgNO3, 9650 C of charge passes through the electroplating bath, the mass of silver deposited on the cathode will be
1.08 g
10.8 g
21.6 g
108 g
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
If emf of the cell Zn| Zn2 (0.01 M)| | Fe2+ (0.001 M) | Fe at 298 K is 0.2957, then the value of equilibrium constant for the cell reaction is?
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
In the reaction : 14 H+ + Cr2O72- + 3Ni → 2Cr3+ + 7H2O + 3Ni2+, which of the following substance is a reducing agent?
H2O
Ni
H+
Cr2O72-
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
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
