In the cell reaction Zn | Zn2+ (1M) II CO3+ (1M) | CO2+ (1M), the value of Eocell is (EoZn2+|Zn = -0.76, Eo CO3+|CO3+ = 1.82 V)
2.58 V
3.58 V
4.58 V
5.58 V
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
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
HNO2 acts both as reductant and oxidant, while HNO3 acts only as oxidant. Why?
solubility ability
maximum oxidation number
minimum oxidation number
minimum number of valence electron
Same amount of electric current is passed through solutions of AgNO3 and HCl. If 1.08 g of silver is obtained in the first case, the volume of hydrogen liberated at S.T.P in the second case is?
22400 ml
2240 ml
224 ml
112 ml
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
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
If specific conductance and conductance of a solution is same, then its cell constant is equal to
0
1
10
100
The cell used for the electrolysis of fused NaCl is
Down's cell
Castner cell
Solvay cell
Nelson cell
If for a reaction ΔGo = 0, then the rate constant of this reaction is
zero
one
less than one
more than one
