Which of the following statement is true for an electrochemical cell?
H2 is cathode and Cu is anode
H2 is anode and Cu is cathode
reduction occurs at H2 electrode
oxidation occurs at Cu electrode
The oxidation number of oxygen atom in O22- ion is
- 1
-2
-3
-5
In which cell, free energy of a chemical reaction is directly converted into electricity?
fuel cell
lechlanche cell
concentration cell
lead storage battery
When 1 Faraday current is passed, which of the following would deposit 1g atomic weight of the metal?
NaCl
BaCl2
AlCl3
CuSO4
Which is the best description of the behaviour of bromine in the reaction:H2O + Br2 → HOBr + HBr
oxidizing only
reducing only
proton acceptor only
both oxidising and reducing
The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium from bauxite by Hall process is (Atomic weight of Al = 27)
90 kg
180 kg
270 kg
540 kg
Which of the following reaction occurs at the cathode?
Fe2+ → Fe3+ + e-
Ag→ Ag2+ + e-
Cu2+ + 2e- → Cu
2OH- → H2O + O + 2e-
On the basis of the information available from the reaction , ΔG = -827 kJ-mol-1 of O2. The minimum e.m.f. required to carry out the electrolysis of Al2O3 is (F = 96500 C-mol-1)
4.28 V
6.42 V
8.56 V
2.14 V
In which direction the electrons flows in the Galvanic cell?
anode to cathode through solution
anode to cathode through external circuit
cathode to anode through solution
cathode to anode through external circuit
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
