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Exploring Substances: Acidic, Basic, and Neutral — Revision Notes

CBSE · Class 7 · Science

Exploring Substances: Acidic, Basic, and Neutral revision notes for CBSE Class 7 Science: 4 topics in quick points.

44 questions68 flashcards5 concepts

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Key Topics to Revise

1

1. Types of Substances

  • Acidic substances turn blue litmus paper red.
  • Basic substances turn red litmus paper blue.
  • Neutral substances do not change the colour of blue or red litmus paper.
2

2. Natural Indicators

  • Litmus is a natural substance obtained from lichens.
  • Litmus is available as a solution and as paper strips in blue and red colours.
  • Lichens are formed by a fungus and an alga living together.
3

3. Neutralisation

  • When an acid mixes with a base in sufficient quantity, the resulting solution is neither acidic nor basic.
  • Such reactions are called neutralisation reactions.
  • Neutralisation produces salt and water with the release of heat.
4

4. Important People and Applications

  • Acharya Prafulla Chandra Ray is known as the Father of Modern Indian Chemistry.
  • He earned a doctorate in chemistry from the United Kingdom.
  • He returned to India and helped advance scientific research.

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Full Notes

Key Concepts

Substances that turn blue litmus paperSubstances that turn red litmus paperTap waterLitmus is a natural substance obtainedRed rose extract is another natural

Frequently Asked Questions

What are the important topics in Exploring Substances: Acidic, Basic, and Neutral for CBSE Class 7 Science?
Key topics in Exploring Substances: Acidic, Basic, and Neutral include Types of Substances, Natural Indicators, Neutralisation, Important People and Applications. Study these first, then practise questions on each for Class 7 exams.
How should I revise Exploring Substances: Acidic, Basic, and Neutral for Class 7 exams?
Learn the core ideas first, then work through the 44 practice questions on Exploring Substances: Acidic, Basic, and Neutral. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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