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
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
Which of the following reaction does not involve either in oxidation or reduction?
Cr → CrCl3
Na → Na+
2S2O32- → S4O62-
K2CrO4 → K2CrO7
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 mass of copper deposited from a solution of Cu2S by passing a current of 2.5 ampere for 6 minute is
0.3 g
0.5 g
0.7 g
0.9 g
0.0352
0.0591
0.1183
0.2366
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-
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
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
