1 : Charles Goodyear once accidentally
P : and found that the resulting rubber
Q : dropped a mixture of natural rubber
R : was harder, stronger, more elastic
S : and sulphur over a hot stove
6 : and non-sticky

The Proper sequence should be:

A. PSQR

B. QSPR

C. RSQP

D. SQPR

Answer: Option B

Solution(By Examveda Team)

Charles Goodyear once accidentally dropped a mixture of natural rubber and sulphur over a hot stove and found that the resulting rubber was harder, stronger, more elastic and non-sticky.