Tick (√) The Correct Alternative From The Choice Given For The Following Statements

A substance which can not sublime is iodine camphor sugar dry ice When you put some ice … chemical change ? salt sugar …

Answers:

A substance which cannot sublime is
 

1. iodine
2. camphor
3. sugar
4. dry ice

When you put some ice cubes in a glass, droplets of water are formed on the outer-wall of the glass. This explains the phenomenon of
 

1. melting
2. freezing
3. condensation
4. evaporation

Burning is a
 

1. slow process
2. fast process
3. natural process
4. none of the above

Which one of the following is volatile in nature ?
 

1. common salt
2. petrol
3. water
4. milk

An example of both physical and chemical change is
 

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

The compound rust is a hydrated oxide of
 

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

When sugar is heated, its colour changes into
 

1. red
2. brown
3. black
4. grey

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

1. oxygen
2. hydrogen
3. nitrogen
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