Prevention of Corrosion

Q. Which of the following methods is not used in prevention of rusting of iron?

1. Galvanization
2. Water wash
3. Greasing
4. Painting

Q.

An alloy of metal with mercury is called___ .

Q.

The alloy of mercury is called___.

1. Amalgam

2. Bronze

3. Brass

4. Solder

Q.

Why is a layer of zinc-coated over iron?

Q.

To protect iron from rusting, it is coated with a thin layer of zinc. Name this process

Q.

Galvanizing is a process in which Iron or Steel is coated with thin layer of _______ to protect them from corrosion.

Q. Stainless steel does not get rust. Why?

Q. Question 2(c)
State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.
Iron pipes coated with zinc do not get rusted easily.

Q.

Rusting of iron can be prevented by:

1. painting
2. galvanizing
3. scrubbing
4. heating

Q. Statement 1: Rusting of iron can be prevented by forming a layer of a substance on it.
Statement 2: The layer prevents the metal from interacting with the atmosphere.

1. Both statements are true.
2. Both statements are false.
3. Only statement 1 is true.
4. Only statement 2 is true.

Q. Silver amalgam is an alloy of with silver.

1. mercury
2. carbon
3. gold

Q.

For preventing corrosion of copper, alloying of copper is done with tin and zinc forming brass and bronze respectively.

1. False

2. True

Q.

Which of the following is called a strategic metal?

1. Boron

2. Titanium

3. Mercury

4. Potassium

Q. Statement 1: Rusting of Iron can be prevented by forming a layer of substance that is chemically inert to atmosphere over the iron article.
Statement 2: The inert layer prevents the metal from interacting with the atmosphere.

1. Statement 2 is false
2. Both statements are true, 2 is the explanation of 1
3. Both statements are true, 2 is not the explanation of 1
4. Statement 1 is false

Q.

Stainless steel is formed by alloying iron with nickel and chromium in order to prevent rusting of iron.

1. True

2. Flase

Q.

Rusting is a ………… process because it….........metals

Q.

Explain the process of formation of iron oxide . Can you name this process of oxidation? Suggest measures how this can be prevented ? [5 MARKS]

Q. Statement I: Corrosion occurs when metals are exposed to atmospheric oxygen and water.
Statement II: Galvanisation is the process of applying thin zinc coating over iron articles.

1. Both statements are correct
2. Both statements are incorrect
3. Only statement I is correct
4. Only statement II is correct

Q.

What is an alloy? Why are alloys made?

Q.

Tinning is the use of tin instead of iron to make corrosion-resistant products.

1. True
2. False

Q.

How can we prevent rusting?

1. Painting
2. Greasing
3. All of these
4. Galvanization

Q.

Why is HCL not used to recover the original colour of the statue of liberty?

Q.

Which of the following method is used for preventing iron from rusting?

1. Applying water

2. Applying a coating of zinc

3. None of these

4. Putting it in air

Q. Molten is used for coating iron in galvanisation.

1. lead
2. zinc
3. copper
4. iron

Q.

Define Rust. Name the factors that hasten the rusting of Iron. What measures can be taken to prevent rusting of Iron? [5 MARKS]

Q. The sculptures made of which amongst the following material will rust easily?

Q. The sculptures made of which amongst the following material will rust easily?

1. Iron, Copper, Stainless steel
2. Iron, Copper, Galvanised iron
3. Iron, Copper, Silver
4. Iron, Copper, Painted steel

Q.

Is rust galvanic corrosion?

Q. The chemical composition of rust is:

1. iron oxide
2. cadmium oxide
3. carbon dioxide
4. sulphur dioxide

Q. How can we prevent rusting?

1. Heating
2. Painting
3. Galvanization
4. Washing