NCERT Class 9 Science Solutions: Chapter 2 – is Matter Around Us Pure Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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2 Acids, Bases and Salts for is Matter Around Us Pu …

Question 10:

Q. 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

A.

Elements

Example of Elements
(a) Sodium
(d) Silver
(f) Tin
(g) Silicon

Compound

Example of Common Compounds
(e) Calcium carbonate
(k) Methane
(l) Carbon dioxide

Mixtures

Example of Common Mixtures
(b) Soil
(c) Sugar solution
(h) Coal
(i) Air
(j) Soap
(m) Blood

Question 11:

Q. Which of the following are chemical changes?

(a) Growth of a plant

(b) Rusting of iron

(c) Mixing of iron filling and sand

(d) Cooking of food

(e) Digestion of food

(f) Freezing of water

(g) Burning of candle

A.

The following changes are chemical changes:

(a) Growth of a plant

(b) Rusting of iron

(d) Cooking of food

(e) Digestion of food

(g) Burning of candle

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