Question

In a science exhibition demonstrate the various methods of detecting food adulteration.

Answer 1

1. Adulteration in Milk (Water Adulteration)
   1. Materials Needed: Dropper, Glass of milk and Transparent glass plate
   2. Method: Put a drop of milk on the glass plate and tilt it.
   3. Observation: Pure milk leaves a white trail. Milk adulterated with water runs quickly without leaving a trail.
2. Adulteration in Salt (Chalk Powder)
   1. Materials Needed: A small amount of salt, Water and Transparent glass
   2. Method: Dissolve a teaspoon of salt in a glass of water. Let it settle for a few minutes.
   3. Observation: If chalk powder is present, it will settle at the bottom
3. Adulteration in Sugar (Washing Soda)
   1. Materials Needed: Sugar, Water and Lime juice or lemon
   2. Method: Dissolve a small amount of sugar in water. Add a few drops of lime juice.
   3. Observation: If it produces bubbles, washing soda is present.
4. Adulteration in Turmeric Powder (Yellow Dye)
   1. Materials Needed: Turmeric powder, Warm water and Test tube
   2. Method: Mix a pinch of turmeric in warm water.
   3. Observation: Pure turmeric will not leave a yellow streak. If yellow dye is present, it will stain the container.
5. Adulteration in Tea Leaves (Iron Fillings)
   1. Materials Needed: Tea leaves and Magnet
   2. Method: Spread tea leaves on a white paper and move a magnet over them.
   3. Observation: Iron fillings will stick to the magnet if present.