In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to
generate heat
create potential difference between the two electrodes
produce high purity water
remove adsorbed oxygen from electrode surfaces
The compound that can work both as an oxidising as well as reducing agent is
KMnO2
H2O2
Fe2(SO4)3
K2Cr2O7
B.
H2O2
The oxidation number of O in H2O2 is -1. It can either increases to zero in O2 or decreases to -2 in H2O. Therefore, H2O2 can act both as an oxidising as well as a reducing agent.
Which one of the following is not a method to remove permanent hardness of water?
Clark's method
Calgon method
Ion- exchange method
Synthetic resins methods
Reaction of calgon with hard water containing Ca2+ ions produce
[Na2CaP6O18]2-
CaCO3
CaSO4
Ca2(PO4)3
Diborane (B2H6) reacts independently with O2 and H2O to produce, respectively:
B2O3 and H3BO3
H3BO3 and B2O3
B2O3 and [BH4]-
HBO2 and H3BO3