Salt bridge contains:
calomel
Corrosive sublimate
H2O
Agar-agar paste
It is not advisable to:
Stir copper sulphate solution with a zinc spoon
Stir silver nitrate solution with a copper spoon
Both (a) and (b)
None of the above
What is the value of the reaction quotient, Q for the cell?
Ni(s)|Ni(NO3)2(0.190M)||KCI(0.40M)
CI(g,1.0 atm)|Pt(s)
3.1x 10-1
1.3x 10-1
8.0x 10-2
3.0x 10-2
Which of following is/are function (s) salf-bridge?
It completes the electrical circuit with electrons flowing from one electrode to other through external wires and a flow of ions between the two compartments through salt-bridge
It prevents the accumulation of the ions
Both correct
None of the above
In which of the following cells will the emf be independent of the activity of the chloride ion?
Zn|ZnCI2 (aq)|Pt(CI2)
Zn|ZnCI2(aq)||KCI(aq)|AgCI(s),Ag
Ag, AgCI(s)|KCI (aq)|Pt(CI2)
Hg, Hg2CI2(s)|KCI(aq)||AgNO3(aq)|Ag
The cell emf is independent of concentration of the species of the cell in:
Fe| FeO(s) | KOH(aq) | NiO(s) | Ni2O3 | Ni
Pt | (H2) | HCI | Pt (Cu2)
Zn | Zn2+ || Cu2+ | Cu
Hg, Hg2CI | KCI || AgNO3 | Ag
In an electrochemical cell that functions as a voltaic cell:
Electrons move from the cathode to the anode
Electrons move through a salt-bridge
Electrons can move either from the cathode to the anode or from the anode to the cathode
Reduction occurs at the cathode
Select correct statement(s):
In a galvanic cell, a spontaneous chemical reaction generates an electric current
In an electrolytic cell, an electric current drives a nonspontaneous reaction
In a galvanic cell, cell reaction is exothermic
All the statements are correct
In the galvanic cell:
Fe(s) + 2Fe3+ (aq) ( 3Fe2+ (aq)
Fe(s) is the cathode because it is in contact with Fe2+ (aq)
Fe(s) is the cathode because it is in contact with Fe3+ (aq)
Fe(s) can’t be used as cathode since it would directly react with Fe3+, then short circuiting the cell
Salt bridge contains Fe2+ and Fe3+ ions
For the cell reaction
Cu(s) + CI2 (aq) ( Cu2+ (aq) + 2CI- (aq)
Cell notation is:
Cu(s)| Cu2+ (aq)|| CI- (aq)| CI2(g)| C(s)
C(s)| CI-(aq)| CI2(g) Cu2+ (aq)| Cu(s)
Cu(s)| Cu2+ (aq)|| CI- (aq)| CI2(g)|
Cu(s)| Cu2+ (aq)|| CI2(g)| CI- (aq)