Physicl and Chemical change

Substances which are formed after the reaction are called-
1. Reactants
2. Products
3. Mixtures
4. None of these
A change in smell may take place in-
1. chemical changes
2. physical changes
3. irreversible changes
4. reversible changes
5. both a & c
Which is/are essential conditions for rusting?
1. Moisture
2. Oxygen
3. Iron
4. All of the above
Photosynthesis is a kind of-
1. Reversible change
2. Irreversible change
3. Physical change
4. None of these
Melting of wax is an example of-
1. reversible change
2. physical change
3. chemical change
4. both a & b
Germination of seed is an example of-
1. chemical change
2. physical change
3. irreversible change
4. both a & c
Reaction between baking soda and vinegar produces
1. change in colour
2. a gas
3. sound
4. none of these
Burning of crackers produce-
1. gas
2. sound
3. light
4. all of these
What kind of change is rusting?
1. reversible
2. irreversible
3. chemical
4. both b & c
What are the methods to prevent rusting?
1. galvanisation
2. tin plating
3. oiling
4. painting
5. all of the above