Iodine Solutions and Their Applications

What is the primary reason iodine is insoluble in water?

• Iodine is a metallic element.

• Iodine is a polar molecule.

• Iodine is a non-polar covalent molecule.

• Iodine forms ionic bonds.

What is the main use of a dilute iodine solution?

• For dental procedures

• As a disinfectant

• For testing the presence of polysaccharides

• As an oral medication

Who first made Lugol's iodine?

• Antoine Lavoisier

• Marie Curie

• Jean Gioma Auguste Lugol

• Louis Pasteur

What is the common formulation of Lugol's iodine?

• 10% iodine and 10% potassium iodide

• 5% iodine and 5% potassium iodide

• 10% iodine and 5% potassium iodide

• 5% iodine and 10% potassium iodide

What is the purpose of the iodine starch test in plant physiology?

• To measure plant growth

• To check if a plant is photosynthesizing

• To test soil quality

• To determine plant age

What is the first step in preparing a dilute iodine solution?

• Heating the solution

• Weighing 4 grams of potassium iodide

• Measuring 100 ml of distilled water

• Weighing 5 grams of iodine crystals

How can the shelf life of iodine solutions be increased?

• By storing in a warm place

• By wrapping the bottle with aluminum foil

• By adding more iodine

• By diluting with more water

What is the role of potassium iodide in iodine solutions?

• It acts as a preservative.

• It provides color to the solution.

• It helps iodine dissolve in water.

• It acts as a solvent.

What is the recommended storage condition for iodine solutions?

• In a freezer

• In a warm, bright place

• In a humid environment

• In a cool, dark place

What is the dilution ratio for using Lugol's iodine to test starch?

• 1:4 or 1:5

• 1:2

• 1:1

• 1:10