Key facts

  • The corrected topic follows the CET graduation Science and Technology block: matter changes, acids-bases-salts, electricity, heat, work and energy, he...
  • Physical and chemical changes must be separated from acids, alkalis and salts because CET questions often test examples, indicators, neutralisation an...
  • Electric current, heat, work and energy should be read with units, household safety, power consumption and simple conversion examples.
  • Diet, nutrition, blood groups, Rh factor and infectious, non-infectious and zoonotic diseases form the public-health core of the syllabus.
  • Environment, biodiversity, conservation, sustainable development and the economic importance of plants and animals connect science with Rajasthan agri...

Key Points at a Glance

  1. 1

    The corrected topic follows the CET graduation Science and Technology block: matter changes, acids-bases-salts, electricity, heat, work and energy, health biology, ecology, agriculture, ICT, defence, space and Rajasthan-specific science.

  2. 2

    Physical and chemical changes must be separated from acids, alkalis and salts because CET questions often test examples, indicators, neutralisation and daily-life compounds.

  3. 3

    Electric current, heat, work and energy should be read with units, household safety, power consumption and simple conversion examples.

  4. 4

    Diet, nutrition, blood groups, Rh factor and infectious, non-infectious and zoonotic diseases form the public-health core of the syllabus.

  5. 5

    Environment, biodiversity, conservation, sustainable development and the economic importance of plants and animals connect science with Rajasthan agriculture and livelihoods.

  6. 6

    ICT, defence technology, space technology, satellites and Rajasthan institutions such as CAZRI Jodhpur and Rawatbhata make the technology portion exam-ready.

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Matter Changes, Acids, Alkalis And Salts

The graduation CET syllabus begins with physical and chemical changes. In a physical change, composition remains the same: melting of ice, evaporation of water, breaking glass, dissolving common salt in water and stretching a rubber band are standard examples. In a chemical change, new substances form: rusting of iron, burning of paper, souring of milk, digestion of food and curd formation are high-yield examples. Chemical changes often show gas evolution, colour change, heat or light, precipitate formation or permanent smell change. Acids release hydrogen ions in water and turn blue litmus red; common examples are hydrochloric acid in gastric juice, citric acid in lemon and acetic acid in vinegar. Alkalis are water-soluble bases; they turn red litmus blue and include sodium hydroxide, potassium hydroxide and calcium hydroxide. Salts form mainly by neutralisation between an acid and a base. Sodium chloride is common salt, sodium bicarbonate is baking soda, sodium carbonate is washing soda and calcium oxychloride is bleaching powder. For CET, remember the application angle: antacids reduce excess stomach acid, lime is used in whitewashing, chlorine-releasing compounds help disinfection, and soil pH affects crop choice. Rajasthan examples are straightforward: alkaline soils in arid districts need soil testing, gypsum is used for sodic-soil improvement, and salt production around Sambhar shows how evaporation and crystallisation work in daily life.

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