SSC MTS EXAM

Detailed explanation-1: -The original plastic wrap that was invented was PVdC (Polyvinylidene Chloride). In 1949 Dow Chemical refined the spray and developed saran plastic wrap. Plastic wrap is commonly made out of PVC (Polyvinylidene Chloride). In recent years other PVC alternatives have become more popular.

Detailed explanation-2: -The noble gases (Group 18) are located in the far right of the periodic table and were previously referred to as the “inert gases” due to the fact that their filled valence shells (octets) make them extremely nonreactive. The noble gases were characterized relatively late compared to other element groups.