MEDIUM
7th CBSE
IMPORTANT
Earn 100

Give two changes that are harmful. Explain why you consider them harmful. How can you prevent them?

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
What is rust? What is the formula of rust?
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
How can we prevent rusting of iron? Write any two ways.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
What is crystallisation?
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
How does the painting of an iron gate prevent it from rusting?
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
What are the essential condition for rusting of iron?
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
Name any three salts present in sea water.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
Name the brown flab substance formed on iron articles when exposed to moist air.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I

Give one word for the following.

Rusting of iron can be prevented by ___________.