In the reaction : Ag2O + H2O2 → 2Ag + H2O + O2, the H2O2 acts as
reducing agent
oxidising agent
bleaching agent
none of these
The standard e.m.f of a galvanic cell, with standard electrode potentials of zinc equal to -0.76 V and that of copper equal to + 0.34 V, is
+ 0.76 V
+ 1.1 V
- 0.34 V
- 1.1 V
During electrolysis, the species discharged at cathode are
ions
cations
anions
all of these
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
H2O2 is
a catalyst
an oxidising agent
a reducing agent
both '2' and '3'
The free energy change for the reaction : Li+ + e- → Li at 298 K is
289.5 kJ
-298.5 kJ
32.16 kJ
-3985 kJ
The e.m.f of a galvanic cell with electrode potentials of A1 equal to -1.66 V and that of Mg equal to -0.54 V is
+0.44 V
+ 1.12 V
- 0.44 V
-1.12 V
The electrolysis of molten anhydrous calcium chloride produces
calcium
phosphorus
sulphur
sodium
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
Which of the following halogen is the weakest oxidising agent?
I
F
Cl
Br
