5253. 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: September 16, 2025 by Admin A. PSQR B. QSPR C. RSQP D. SQPR ✅ The correct answer is option B.
