An example of both physical and chemical change is:

1. burning of candle
2. melting of ice
3. cooking of food
4. glowing of bulb

The compound rust is a hydrated oxide of:

1. copper
2. aluminium
3. iron
4. gold

A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of:

1. oxygen gas
2. hydrogen gas
3. nitrogen gas
4. water vapour

When we add water to the following substances, which one will show a chemical change?

1. salt
2. sugar
3. oil
4. quick lime