EASY
9th CBSE
IMPORTANT
Earn 100

Brass is a homogeneous substance of zinc and copper. Why is it regarded as a mixture?

Important Questions on Is Matter Around Us Pure?

EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 2
What are the favorable qualities given to gold when it is alloyed with copper or silver for the purpose of making ornaments?
MEDIUM
9th CBSE
IMPORTANT
Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 1
Statements given below pertain either to a mixture or a compound. Identify the statement, which belongs to: 
(i) a mixture        (ii) a compound.
(a) The properties of the constituents are entirely different from the properties of the product of their chemical reaction.
(b) The constituents retain their individual chemical properties.
MEDIUM
9th CBSE
IMPORTANT
Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 2
Common salt solution is a homogeneous substance. State two reasons which suggest that it is a mixture.
MEDIUM
9th CBSE
IMPORTANT
Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 1
An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?
HARD
9th CBSE
IMPORTANT
Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 2
State three reasons why air is regarded as a mixture.
HARD
9th CBSE
IMPORTANT
Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 3

Give three reasons why air is regarded as a compound.

“Note: This question given in the book seems to have error and the modified question should be as given below.”

Give three reasons why water is regarded as a compound.

EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 4
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a lustrous non-metal.
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 4
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.