Uses of Halogens and Their Compounds

Halogens, though toxic in elemental form, have numerous beneficial uses in their compound forms. Fluorine is used in toothpaste and non-stick pans, while chlorine is found in pool disinfectants and household cleaners. Sodium and calcium chloride are used in food and road safety. PVC, a chlorine compound, is versatile in construction and healthcare. Bromine is used in chemical testing and photography. Iodine serves as an antiseptic and is essential in diets to prevent goiter. Overall, halogen compounds play vital roles in daily life.

What is the role of sodium fluoride in toothpaste?

• To strengthen gums

• To prevent tooth decay

• To whiten teeth

• To freshen breath

Why is Teflon used in non-stick pans?

• It is heat resistant

• It is a fluorine-containing compound

• It is cheap

• It is colorful

What is the main use of sodium hypochlorite in swimming pools?

• To reduce water evaporation

• To disinfect the water

• To increase water temperature

• To add color to the water

What is a common household use of bleach?

• To clean windows

• To remove rust

• To disinfect surfaces

• To polish furniture

How does road salt prevent ice formation?

• By reflecting sunlight

• By increasing friction

• By lowering the freezing point of water

• By absorbing moisture

What is PVC commonly used for?

• Manufacturing rubber

• Making glass

• Insulating electrical wiring

• Producing paper

What change occurs when bromine is used to test for alkenes?

• It turns from red to yellow

• It turns from blue to green

• It turns from colorless to orange

• It turns from orange to colorless

What compound is used in photographic paper?

• Silver chloride

• Silver bromide

• Silver nitrate

• Silver iodide

What is a dietary source of iodine?

• Freshwater fish

• Whole grain bread

• Red meat

• Iodized salt

What condition can result from iodine deficiency?

• Anemia

• Scurvy

• Goiter

• Rickets