Rusting

• Chemistry
• Secondary Education
• Age 13

Physical and chemical change

Which is the best method to prevent rusting?

1. Painting 
2. Greasing
3. Galvanization
4. Precipitation

A man painted his main gate made up of iron, to
i) Prevent it from rusting. ii) Protect it from sun
iii) Make it look beautiful. iv) Make it dust free.
Which of the above statement(s) is/are correct?

1. (i) and (ii)
2. (ii) and (iii)
3. Only (iii)
4. (i) and (iii)

What does tarnish means ?

1. lose or cause to lose lustre, especially as a result of exposure to air or moisture.
2. destroy or damage (metal, stone, or other materials) slowly by chemical action.
3. combine chemically with oxygen.
4. Combine with hydrogen.

What conditions are required for rusting? 

1. dry cold conditions
2. hot damp conditions
3. dry hot conditions
4. Only damp condition

Galvanization is a process used to prevent the rusting of ______________. It is to coat ___________ on it.

1. Iron, Zinc
2. Zinc, iron
3. Aluminium, iron
4. Copper, zinc

Which of the following is a chemical change?

1. Germination of seeds
2. Rusting of iron
3. blowing a balloon
4. Both (a) and (c)

An iron nail is taken to the moon. Another nail is kept near gateway of India in Mumbai, while the third nail is kept near the Red Fort in Delhi. Which nail will rust faster. Why?

Do you think this bridge
in the picture needs
to be painted? Why?