Corrosion

Q.

What are the factors that affect the rate of corrosion?

Q.

Define rusting of iron

Q.

Chemically rust is:

1. Hydrated ferrous oxide

2. Hydrated ferric oxide

3. Only ferric oxide

4. None of these

Q.

What are the advantages of corrosion?

Q.

Process of rusting in iron is ?

1) Oxidation

2)Reduction

3)Corrosion

Q.

Which of the following metals is protected even by a layer of its oxide?

1. Copper

2. Silver

3. Iron

4. Aluminium

Q. The number of non-ionisable protons present in the product $B$ obtained from the following reactions is .
$C_2{H}_{5}OH+PC{l}_3\to C_2{H}_{5}Cl+A$
$A+PC{l}_3\to B$

Q.

What is the term used for corrosion of iron?

Q.

Rust is a mixture of:

1. Fe₂O₃ and Fe (OH)₃

2. Fe₃O₄ and Fe (OH)₃

3. Fe₂O₃ and Fe (OH)₂

4. FeO and Fe (OH)

Q.

What is the green coating that gets formed on the copper surface?

1. Copper oxide

2. A double salt of Copper gets formed

3. Copper carbonate

4. Copper sulphate

Q. Write the complete chemical reaction of rusting of iron.

Q.

30. Which among the following metals is used in alloying of iron to prevent corrosion?

1. zinc

2. tin

3. aluminium

4. chromium

Q. Which of the following is used for the preparation of colloids?

1. Mond Process
2. Bredig's Arc Method
3. Van Arkel Method
4. Ostwald Process

Q.

Which of the following factors play vital role in corrosion process?

1. Pressure

2. Temperature

3. Both A and B

4. None of these

Q.

What are the two types of corrosion?

Q. The main factors which affect corrosion are :

1. Position of metal in electrochemical series
2. Presence of $C{O}_2$ in water
3. Presence of impurities coating
4. All are correct

Q. Why do silver articles become black after sometime when exposed to air?

Q.

How will you come to know whether cheese has become rancid or not?

Q.

What would happen if the protective tin coating over an iron bucket is broken from some places?

1. The portion of Iron exposed will undergo corrosion

2. The part that is broken will absorb moisture

3. The broken part gets changed into green colour

4. The Iron exposed in the broken parts will not be affected

Q.

Iron articles are galvanized. Explain the statement

Q. What do you mean by corrosion? How can you prevent it?

Q.

What is the chemical formula of rust?

Q. What do you mean by metal corrosion? Explain three methods for prevention of corrosion.

Q.

In Sacrificial protection of Iron the active metal that is most commonly used is:

1. Zinc

2. Nickel

3. Tungsten

4. Copper

Q. Even though aluminium is a reactive metal, it does not easily react with water. Why?

Q. For prevention of corrosion of iron by cathodic protection:

1. Iron is converted into cathodic site.
2. Iron is converted into anodic site.
3. Iron is brought in contact with a metal that is more easily reduced.
4. Both (a) and (c)

Q. corrosion of metal is generally a serious problem while corrosion of some metal is an advantage why

Q.

How does Corrosion Occur?

Q. In the rusting of Iron, which of the following reaction occurs at cathode?

1. $F{e}^{2+}|Fe$
2. $O_2|H_{2}O$
3. $F{e}^{3+}|F{e}^{2+}$
4. $Fe|F{e}^{3+}$

Q.

What are Corrosion Inhibitors?