Question

II. Fill in the blanks :
1. Changes which take place by nature are
2. Changes which are harmful to us are known
3. Changes which take longer duration of time
for completion are called
4. Magnetising of an iron nail is a
5. New substances are formed during a​

Answer 1

Answer:

1. Natural changes
2. undesirable changes
3. Dont know
4. Dont know
5. Chemical change