Faraday's law of electrolysis states that mass deposited on electrode is proportional to
I2
Q
Q2
none of these
H2O2 is
a catalyst
an oxidising agent
a reducing agent
both '2' and '3'
The pair of compounds, in which both the metals are in their highest possible oxidation state, is
[Fe(CN)6]3-
TiO3, MnO2
CrO2Cl2, MnO4-
[Co(CN)6]3-, MnO3
What is the single electrode potential of zinc electrode in 0.01 M ZnSO4 solution at 25oC (Eo = -0.76 V)?
-0.82 V
-1.82 V
-2.82 V
-3.82 V
Faraday constant
is a numerical constant
depends on equivalent
depends upon the current passed
depends on the number of electrons
A certain current liberates 0.504g of hydrogen in 2 hours. The copper liberated by the same current flowing for the same time in copper sulphate solution will be
12.7 g
16.0 g
31.8 g
63.5 g
In an electrolytic cell, the flow of electrons is from
cathode to anode in the solution
cathode to anode through external supply
cathode to anode through internal supply
anode to cathode through internal supply
Which of the following condition will increase the voltage of the cell, represented by the reaction Cu(s) +2Ag+(aq) → Cu2+(aq) + 2Ag(s)?
Increase in the concentration of Ag+ ions
Increase in the concentration of cu+2 ions
Increase in the dimensions of silver electrode
Increase in the dimensions of copper electrode
The EoM3+/M2+ values for Cr, Mn, Fe and Co are -0.41 V, + 1.57 V, +0.77 V and +1.97 V respectively. For which one of the metals, the change in oxidation state from +2 to +3 will be easiest?
Cr
Co
Fe
Mn
What is the oxidation number of iron in the compound [Fe(H2O)5(NO)+]2+
+ 1
+ 4
+ 5
+ 7