6th Class
Science
Changes Around us
Question Bank
Changes Around us
question_answer
DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 1 Copper statues exposed to carbon dioxide and water in the air become coated with patina. The patina is not copper, it is not carbon dioxide, and not water. It is a new substance formed by the reaction of these chemicals with one another. The change described above is a
A)reversible change
B)irreversible change
C)expansion
D)contraction
Correct Answer:
B
Solution :
It is a chemical change so it is irreversible change.