When MnO2 is fused with KOH, a colouredcompound is formed. The product and its colour is:
K2MnO4 , purple colour
Mn2O3 , brown
Mn2O4 , black
KaMnO4 , purple
H2C2O4 + KMnO4 in acidic medium reacts to have change in oxidation number of Mn from
7 to 5
2 to 7
5 to 7
7 to 2
Which of the following is most powerful oxidising agent?
I2
Cl2
Br2
F2
D.
F2
Fluorine hydration energy is very high due to its small size. It has high positive electrode potential than chlorine. Hence, among halogens, F2 is strongest oxidising agent.
For which of the following elements it is difficult to disproportionate in +3 oxidation state ?
N
As
Sb
Bi
Substances that are oxidised and reduced in the following reaction are respectively
N2H4 (l) + 2H2O2 (l) N2 (g) + 4H2O (l)
N2H4, H2O
N2H4, H2O2
N2, H2O2
H2O, N2