Electrochemistry Test

Result

Electrochemistry Test - 6

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Question 1
1 / -0

In corrosion, a metal is ______ of electrons which --------- to form oxides and hydroxides.

A
oxidised by gain, reduces metal ion

B
reduced by loss, oxidises oxygen

C
oxidized by loss, reduces oxygen

D
oxidized by gain, reduces moisture

Solution

During corrosion, Metals is oxidized by loss of electrons to metal ions and free electrons. The free electrons reduce the oxygen often times forming oxides and hydroxides.
Question 2
1 / -0

The simplest method to prevent corrosion is

A
by covering the surface with moisture

B
by covering the surface with paint or by some chemicals

C
by covering the surface with citric acid

D
by covering the surface with salt

Solution

Best way to prevent corrosion is to prevent the surface of metallic object to come in contact with atmosphere. This can be done by painting the object or covering it with other chemicals.
Question 3
1 / -0

An electrochemical method to prevent corrosion is to provide a sacrificial electrode of another metal (like Mg, Zn, etc.) which corrodes itself but saves the object. A typical example is

A
black oxidation of iron

B
galvanization of iron

C
painting of iron

D
greasing of iron

Solution

Galvanization is a process in which iron is coated with reactive metal like Zn which get corroded hence preventing iron from corrosion.
Question 4
1 / -0

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

A
Cu > Al >Zn > Fe > Mg

B
Mg > Al > Cu > Fe > Zn

C
Mg > Al > Zn > Cu > F

D
Mg > Al > Zn > Fe > Cu

Solution

In application of electrochemical series, the metal which has lower reduction potential has higher tendency to get oxidised and would displace metals with lesser reduction potential from their salt solution.