Answers section
Questions 2.3.1(b) 
- What is the effect of chlorine on wet litmus paper?
- What happens when chlorine dissolves in water?
- What is the effect of gaseous halogens on burning and glowing splint?
- How do halogens, smell? (Find out from other sources.)
Answers to Questions 2.3.1(b) 
- Chlorine turns blue litmus red then bleaches it immediately to white.
- Chlorine reacts with water to form two acids, namely hydrochloric acid—which blue litmus red, and chloric (I) acid, which causes bleaching.
- Gaseous halogens extinguish a burning or glowing wooden splint.
- Halogens have sharp pungent and chocking smells. They are poisonous.