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Exploring Substances: Acidic, Basic, and Neutral

CBSE · Class 7 · Science

Quick revision notes for Exploring Substances: Acidic, Basic, and Neutral — CBSE Class 7 Science. Key concepts, formulas, and definitions for last-minute revision.

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?
Exploring Substances: Acidic, Basic, and Neutral covers several key topics that are frequently asked in CBSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Exploring Substances: Acidic, Basic, and Neutral — CBSE Class 7 Science?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and 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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