EASY
7th CBSE
IMPORTANT
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Pure crystals can be obtained from their saturated solution.

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Important Questions on Physical and Chemical Changes

EASY
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
A process in which a chemical change occurs is called _____. (physical reaction / chemical reaction)
EASY
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
A homogeneous mixture of two or more element in a definite composition is called _____.
EASY
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
A process of obtaining pure crystals of a substance from its saturated solution _____.
EASY
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
A process by which the surface of iron articles is coated with metals which are not attacked by moisture _____.
EASY
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
A process in which iron articles are coated with a layer of molten zinc is called _____.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q II
Rusting of an iron object is faster in coastal areas than in desert area. Explain why?
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q II
Give reason for the following:
(a) Lime water turns milky on passing carbon dioxide through it.
 
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q II

Give reason for the following:

(b) Bubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.