NCERT Question 10 - Chapter 2 Class 9 - Is Matter Around Us Pure

Classify the following into elements, compounds and mixtures.

(a) Sodium

(b) Soil

(c) Sugar solution

(d) Silver

(e) Calcium carbonate

(f) Tin

(g) Silicon

(h) Coal

(i) Air

(j) Soap

(k) Methane

(l) Carbon dioxide

(m) Blood

Answer

• Element- These are basic forms of matter which cannot be broken down into simpler substances by chemical reactions.
• Compound- These are substances which are made up of 2 or more elements. They are chemically combined together in a fixed proportion.  
• Mixture- They are formed by mixing of 2 or more substances (these may be elements or compounds). They have a variable composition.

Let's look at each of them now

1. Sodium - Element
2. Soil - Mixture 
3. Sugar solution - Mixture 
4. Silver - Element
5. Calcium carbonate - Compound 
6. Tin - Element 
7. Silicon - Element 
8. Coal - Element
9. Air - Mixture 
10. Soap - Mixture 
11. Methane - Compound  
12. Carbon dioxide - Compound 
13. Blood - Mixture