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Syllabus

Acids, Bases and Salts — Syllabus

NIOS · Class 10 · Science & Tech

What Acids, Bases and Salts covers in NIOS Class 10 Science & Tech: 4 topics, for the 2026-27 session. Part of the NIOS Class 10 Science & Tech syllabus.

43 questions30 flashcards5 formulas & key relations5 concepts

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An infographic illustrating various real-world applications and implications of pH, including acid rain, soil pH for plant growth, pH in the digestive system, tooth decay, and self-defense by animals
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4 Topics · NIOS Class 10 Science & Tech · 2026-27

Topics in Acids, Bases and Salts

1

1. Acids and Bases: Basic Ideas

  • The term acid comes from the Latin word meaning sour.
  • Robert Boyle first used the terms acid and base in the seventeenth century based on properties such as taste, corrosive nature, litmus change, and mutual neutralisation.
  • An acid is a substance which furnishes hydrogen ions (H+) when dissolved in water.
2

2. Indicators and Their Colours

  • Indicators are substances that show one colour in acidic medium and another colour in basic medium.
  • Litmus is a natural dye from lichens and the earliest indicator.
  • Litmus is red in acidic solution, blue in basic solution, and purple in neutral solution.
3

3. Properties and Reactions of Acids

  • Acids generally taste sour.
  • Acids are corrosive to metals.
  • Solutions of acids in water conduct electricity because they produce ions.
4

4. Properties and Reactions of Bases

  • Bases taste bitter and feel soapy to touch.
  • Aqueous solutions of bases conduct electricity because they produce ions.
  • Bases furnish OH- ions in water.

Key Concepts

Central concept: Acids, Bases and Salts

AcidsBasesIndicatorsWater and dissociationIonic product of waterpH and pOHImportance of pHSalts

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Frequently Asked Questions

What are the important topics in Acids, Bases and Salts for NIOS Class 10 Science & Tech?
Key topics in Acids, Bases and Salts include Acids and Bases: Basic Ideas, Indicators and Their Colours, Properties and Reactions of Acids, Properties and Reactions of Bases. Study these first, then practise questions on each for the NIOS Class 10 board exam.
How should I revise Acids, Bases and Salts for the NIOS Class 10 board exam?
Learn the core ideas first, then work through the 43 practice questions on Acids, Bases and Salts. 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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