State the observation when: (i) ethylene gas is bubbled through bromine water. (ii) a piece of sodium is dropped into ethyl alcohol. (iii) acetylene gas is burnt in air. (iv) an acidified solution of potassium dichromate is added to ethyl alcohol.
Question 4:
(i) What happens when an inflated air balloon is pricked with a pin? Name the property of the gaseous state exhibited by this observation.