Which metal can displace iron from iron(II) sulfate solution? MCQ with Answer and Explanation

Explanation:
The periodic table has 7 horizontal rows called periods. Elements in the same period have the same number of electron shells. Properties change gradually across a period. Groups are vertical columns (18), where elements have similar valence electron configurations and thus similar chemical properties. Families are informal group names (e.g., halogens). Blocks (s, p, d, f) are based on the orbital in which the last electron enters.

Explanation:
Zinc coating (galvanizing) provides both barrier and sacrificial protection. Even if scratched, zinc corrodes instead of iron because it is more reactive.

Explanation:
PVC (polyvinyl chloride) is an addition polymer of vinyl chloride monomer (CH₂=CHCl). It is used for pipes, cables, flooring, and medical equipment. Teflon from tetrafluoroethene, polythene from ethylene, nylon is a polyamide (condensation polymer). PVC can be rigid or flexible depending on plasticizers added. It is a thermoplastic. Disposal of PVC by burning produces toxic HCl gas.