The electrolysis of molten anhydrous calcium chloride produces
calcium
phosphorus
sulphur
sodium
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
The standard reduction potentials of Zn and Ag in water are Zn+2 + 2e- Zn ;(Eo = -0.76 V) and Ag+ + e- Ag; (Eo = + 0.80 V) at 298 K. Which of the following reaction is feasible?
Zn(s) + 2Ag+(aq) → Zn+2(aq) + 2Ag(s)
Zn+2(aq) + Ag+(aq) → Zn(s) + Ag(s)
Zn(s) + Ag(s) → Zn+2(aq) + Ag+(aq)
Zn+2(aq) + 2Ag(s)→2Ag+(aq) + Zn(s)
A smuggler could not carry gold by depositing iron on the gold surface, because
iron rusts
gold is denser
gold has lower standard reduction potential than iron
gold has higher standard reduction potential than iron
For standard reduction potentials of three metals A, B and C are +0.5 V, -3.0 V and -1.2 V respectively. The reducing powers of these metals are
B > C > A
A > B > C
C > B > A
A > C > B
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 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
Which of the following transition metal shows highest oxidation state?
Sc
Ti
Os
Zn
If for a reaction ΔGo = 0, then the rate constant of this reaction is
zero
one
less than one
more than one
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
