Physical and Chemical changes

Which of the following is a physical change?
1. Rusting of iron
2. Melting of wax
3. Water into steam conversion
4. Both (b) and (c)
Which of the following is a chemical change?
1. inflation of balloon
2. lightening
3. stretching of rubber
4. cooking of food
Which process is used to provide layer of zinc on iron to prevent rusting?
1. crystallisation
2. galvanisation
3. tin Plating
4. none of these
Which of the following is an anti-rust solution?
1. alkaline chromate
2. alkaline phosphate
3. both a and b
4. none of these
Cutting of paper into pieces is a type of-
1. chemical change
2. physical change
3. cannot say
4. both a and b
Change in which substance undergoes change in shape-
1. chemical change
2. physical change
3. both a & b
4. none of these
No new substances are formed in-
1. chemical changes
2. physical changes
3. both a & b
4. none of these
Energy conversions take place in-
1. chemical change
2. physical change
3. irreversible change
4. both a & c
Which of the following undergoes crystallisation?
1. sodium chloride
2. potassium chloride
3. copper sulphate
4. all of these
Burning of wood is an example of-
1. chemical change
2. reversible change
3. physical change
4. both b & c