MEDIUM
7th CBSE
IMPORTANT
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Write word equation for the following:

(b) Iron displaces copper from its copper sulphate solution.

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q III
What happens when magnesium oxide is dissolved in water? Write the chemical reaction.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q III
How is salt extracted from seawater?
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q III
Explain how painting of an iron gate prevents it from rusting.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q III
What is galvanisation? Why is it done on metals which corrode easily?
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q IV
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
(a) What changes do you expect?
 
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q IV

A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.

(b) Are these changes chemical in nature?

MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q IV

A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.

(c) Write a word equation for the chemical change if any.

MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q IV
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(a) Do you think rust is different from iron?