# Redox Reactions and Electrochemistry

### Conductivity is directly proportional to area of the vessel

Conductivity (unit Siemen’s S) is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel then the unit of the constant of proportionality is

1. S2 m2 mol-2
2. S-2 m2 mol
3. S m mol-1
4. S m2 mol-1

### In a hydrogen­-oxygen fuel cell, combustion of hydrogen occurs to

In a hydrogen­-oxygen fuel cell, combustion of hydrogen occurs to

1. remove adsorbed oxygen from electrode surface
2. produce high purity water
3. generate heat
4. create potential difference between the two electrodes

### Which of the following is a redox reaction

Which of the following is a redox reaction?

1. NaCl + KNO3 → NaNO3 + KCl
2. Mg(OH)2 + 2NH4Cl → MgCl2 + 2NH4OH
3. CaC2O4 + 2HCl → CaCl2 + H2C2O4
4. 2Zn + 2AgCN → 2Ag + Zn(CN)2