Reactions that release energy to the surroundings, usually as heat. Enthalpy change (ΔH) is negative. Examples: Respiration, Combustion.
Reactions that absorb energy from the surroundings. ΔH is positive. Examples: Photosynthesis, Decomposition of CaCO₃.
Breaking bonds requires energy (Endothermic), while forming bonds releases energy (Exothermic). The net difference determines the overall heat change.
When studying Exothermic & Endothermic Notes & MCQs | Chemistry Reaction Quiz for your final board exams, it is critical to focus on the core concepts and fundamental formulas. Relying strictly on NCERT textbook solutions and practicing previous year questions (PYQs) is the proven methodology for scoring high marks. Avoid rote memorization and instead focus on the logical application of the theories presented in this chapter.
The most effective way is to create short, handwritten revision notes and continuously test your knowledge using our interactive Mock Tests. Spaced repetition and active recall are much better than passive reading.
Board exams tend to favor conceptual application questions and direct formula-based derivations from the NCERT syllabus. Ensure you have solved every single exercise in the official textbook.
Yes, the NCERT textbook is the absolute gold standard for board exams. However, to improve your speed and accuracy during the actual exam, you must supplement your reading by solving timed mock tests and objective questions.