In which of the following reaction, ozone acts as a reductant?
Ag2O + O3 → 2Ag + 2O2
KNO2 + O3 → KNO3 + O2
PbS + 4O3 → PbSO4 + 4O2
Na3AO3 + O3 → Na3AsO4 + O2
Which of the following reaction does not involve either in oxidation or reduction?
Cr → CrCl3
Na → Na+
2S2O32- → S4O62-
K2CrO4 → K2CrO7
If emf of the cell Zn| Zn2 (0.01 M)| | Fe2+ (0.001 M) | Fe at 298 K is 0.2957, then the value of equilibrium constant for the cell reaction is?
The mass of copper deposited from a solution of Cu2S by passing a current of 2.5 ampere for 6 minute is
0.3 g
0.5 g
0.7 g
0.9 g
The mass of copper deposited from a solution of CuSO4 by passing a current of 5 A for 15 min is (Atomic Wt. of copper = 63.5)
In the reaction : 14 H+ + Cr2O72- + 3Ni → 2Cr3+ + 7H2O + 3Ni2+, which of the following substance is a reducing agent?
H2O
Ni
H+
Cr2O72-
In which of the following reaction, hydrogen is acting as an oxidizing agent?
with S to give H2S
with I2 to give HI
with Li to form LiH
with Cl to give HCl
2H2(g) + O2(g) → 2H2O(I)
2Fe(s) + O2(g) + 4H+(aq) → 2Fe2+(aq) + 2H2O(I)
Pb(s) + PbO2(s) + 2H2SO4(aq) →2PbSO4(s) + 2H2O(I)
Cd(s) + 2Ni(OH)3(s) → CdO(s) + 2Ni(OH)2(s) + H2O(I)
H2O2 is
a catalyst
An oxidizing agent
A reducing agent
Both '2' and '3'
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