Electrochemistry - Online Test
Q1. In corrosion a metal is ______ of electrons to oxygen and formation of oxides
Answer : Option D
Explaination / Solution:
Metals is oxidized by loss of electrons on corrosion.
Q2. One of the simplest methods of preventing corrosion is to prevent the surface of the metallic object to come in contact with atmosphere. This can be done
Answer : Option C
Explaination / Solution:
Best way to prevent corrosion is to prevent the surface of metallic object to come in contct with atmosphere.
Q3. An electrochemical method is to provide a sacrificial electrode of another metal (like Mg, Zn, etc.) which corrodes itself but saves the object. A typical example is
Answer : Option C
Explaination / Solution:
Galvanization is a process in which iron is coated with reactive metal like Zn which get corroded hence preventing iron from corrosion.
Q4. Correct arrangement of Al, Cu, Fe, Mg and Zn in the order in which they displace each other from the solution of their salts is
Answer : Option B
Explaination / Solution:
Reactivity series.
Q5. Calculate the standard cell potentials of galvanic cell, and equilibrium constant of the reactions if the reaction is
Answer : Option D
Explaination / Solution:
Q6. Calculate the standard cell potentials of galvanic cell, ∆_r G^oand equilibrium constant of the reactions if the reaction is
Answer : Option A
Explaination / Solution:
Q7.
Emf of the cell
at 298 K is
at 298 K is
Answer : Option D
Explaination / Solution:
Q8. Emf of the cell
at 298 K is
at 298 K is
Answer : Option D
Explaination / Solution:
Q9. Emf of the cell
at 298 K is
at 298 K is
Answer : Option B
Explaination / Solution:
Q10. In the button cells widely used in watches and other devices the following reaction takes place:
Determine E^ofor the reaction.
Determine E^ofor the reaction.
Answer : Option D
Explaination / Solution:
