Question

the gas we use in the kitchen is called liquefied petroleum gas [LPG] in the cylinder. It exists as liquid when it comes out of the cylinder it becomes a gas (change A),then it burns (change B)
The following statements pertain to these changes. Choose the correct option.
(I)Process A is a chemical change
(ii)Process B is a chemical change
(III)Both processes A and B are chemical changes
(iv) none of the processes is a a chemical change​

Answer 1

Answer:

When it 'comes out' from the 'cylinder', it becomes a 'gas' (Change – A) then it 'burns' (Change – B). Thus Process A is a 'physical change' since Process A involves the change of state of matter from liquid to gas.

Answer 2

(ii) Process –B is a chemical change.