Conditions for Rusting

Q. Why is there an .x in the formula of rust

Q. Give reason why rusting takes place faster near a sea coast.

Q.

What will happen to the iron if it is completely immersed in water, with water having a layer of oil on its surface to avoid the interaction with air?

1. Partially rusting will be observed.

2. No rusting will be observed

3. None of these

4. It will turn into a completely rusted substance

Q.

What is rusting? What conditions are required for the rusting of iron?

Q.

Name the two essential conditions for rusting. [2 MARKS]

Q.

Rust on iron is basically_________.

1. Chloride

2. Sulphide

3. Oxide

4. Nitride

Q.

Define Rust. Name the factors that hastens the rusting of Iron. [5 MARKS]

Q.

Define rusting.

Q.

Define the term rusting.

Q.

When water and air both simultaneously act on the surface of the iron, it causes corrosion which is termed as rusting in case of iron.

1. True

2. False

Q.

What will be the consequence if iron will be exposed in dry air with anhydrous crystal kept inside?

1. Complete rusting will be seen

2. None of these

3. Partial Rusting will be seen

4. No rusting will be seen

Q. <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Why does iron not rust when dipped in boiling water? [2 marks]

Q.

What is used as a drying agent in an experiment on the rusting process?

1. Copper chloride

2. Zinc chloride

3. Anhydrous calcium chloride

4. Anhydrous calcium sulphate

Q.

Which of the following is true about rusting?

1. rusting will take place in absence of water

2. rusting will not take place in the presence of water and air

3. rusting will take place in absence of air

4. none of these

Q.

Why is rusting of iron objects faster in the rainy season than in summer season?

1. Content of moisture in air is low in rainy season whereas air is almost dry in summer season.

2. Content of moisture in air is high in rainy season whereas air is almost dry in summer season.

3. Content of moisture in summer season is high whereas air is dry in rainy season.

4. High temperature in summer season prevents rusting.

Q. What are the conditions for rusting?

Q.

3. Which of the following statements about rusting is true?

1. It is a fast process

2. During rusting, a large quantity of heat is produced

3. It takes place at a normal temperature

4. It takes place only in daylight