What is rusting? 

Important Questions on Changes Around Us

EASY

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q IV

What is an alloy? Give two examples.

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q IV

What conditions are required for iron to rust ? 

EASY

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q V

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q V

How can you prove that melting of ice is a physical change? Explain an experiment.

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q V

Describe two methods of preventing rust. 

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q V

Describe how would you obtain crystals of copper sulphate.

EASY

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q VI

Why is rusting of iron faster in coastal areas than desert? 

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q VI

How painting on an iron gate prevents it from rusting ?