Question

Give one practical example of chemical change,reversibile change, desirable changeand undesirable change

Answer 1

Chemical change - Burning of wax candle
Reversible change - Melting of ice
Desirable change - Cooking of food
Undesirable change - Corrosion of metals

Answer 2

Hi dear,
The practical example of:
1. Chemical change : Converting of flour into edible form(eg-Chapati,bread)
2. Reversible change: Conversion of ice into water and vice versa
3. Desirable : conversion of curd into other forms(eg:lassi,curry)
4.Undesirable: rottening of fruits and vegetables
Hope it helps