Chlorine is added to drinking water to: MCQ with Answer and Explanation

Explanation:
Isobars: same mass number, different atomic number. Example: ⁴⁰Ar, ⁴⁰Ca. Isotopes: same atomic number, different mass number. Isotones: same number of neutrons. Isomers: same molecular formula, different structure.

Explanation:
Bakelite, the first fully synthetic plastic, is a thermosetting phenol formaldehyde resin. It is formed by a condensation reaction between phenol and formaldehyde. Once molded and heated, it sets permanently and cannot be remelted. It is used for electrical switches, utensil handles, and jewelry.

Explanation:
Alpha rays consist of ⁴₂He²⁺ particles (2 protons + 2 neutrons). They have low penetration but high ionization power.