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Which change cannot be easily reversed?कौन सा बदलाव आसानी से उलटा नहीं किया जा सकता?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: Burning paperकागज का जलना
Burning paper forms new substances that cannot easily become paper again. Exam tip: irreversibility can indicate chemical change.कागज जलने पर नए पदार्थ बनते हैं जिन्हें वापस कागज बनाना आसान नहीं। परीक्षा में अपरिवर्तनीयता रासायनिक संकेत हो सकती है।
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