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Chapter 1 – Chemical Reactions and Equations

NCERT Class 10 Science Chapter 1 – Chemical Reactions and Equations NCERT Solutions (Quick and Exam-oriented) --- 1. Very short answers (1 mark) Q1. What is a chemical reaction? Ans. A process in which one or more substances change to form new substances. Q2. Why should chemical equations be balanced? Ans. To satisfy the law of conservation of mass. Q3. Name the reactants in Zn + H₂SO₄ → ZnSO₄ + H₂ Ans. Zn and H₂SO₄. Q4. Which gas is evolved when zinc reacts with dilute acid? Ans. Hydrogen gas. Q5. What is corrosion? Ans. Slow destruction of a metal by chemical reaction with air and moisture. Q6. Give one example of oxidation. Ans. 2Mg + O₂ → 2MgO. Q7. Give one example of reduction. Ans. CuO + H₂ → Cu + H₂O. Q8. What is a skeletal equation? Ans. An unbalanced chemical equation. Q9. What is rancidity? Ans. Oxidation of oils and fats causing bad smell and taste. Q10. Which substance is reduced in CuO + H₂ → Cu + H₂O ? Ans. Copper(II) oxide (CuO). --- 2. Short answer questions (2–3 marks)...

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Tense: 100 Common Errors

 Here is a complete, exam-focused list of 100 Common Errors in Tenses for Class X, each with correction and Hindi explanation. Language is simple and board-exam friendly. --- 100 Common Errors in Tenses (Class X) With Hindi Translation --- A. Simple Present Tense Errors 1. ❌ He go to school daily. ✅ He goes to school daily. 👉 वह रोज स्कूल जाता है। (He/She के साथ s/es) 2. ❌ She play piano well. ✅ She plays piano well. वह पियानो अच्छा बजाती है। 👉 She के साथ s लगेगा। 3. ❌ I am knowing him. ✅ I know him. उसे पहचानती हूँ। 👉 Know का continuous नहीं होता। 4. ❌ He is having two brothers. ✅ He has two brothers. --- उसके दो भाई हैं। 👉 Have (possess) का continuous नहीं। 5. ❌ The sun rise in the east. ✅ The sun rises in the east. सूरज पूर्व में उगता है। 👉 Universal truth में s/es जरूरी। 6. ❌ She do her work carefully. ✅ She does her work carefully.  वह अपना काम ध्यान से करती है। 👉 Do → does (he/she) 7. ❌ I goes to market daily. ✅ I go to market daily. मैं रोज़ बाज़ार जाता हूँ। 👉 I ...

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Mathematics Class Ten

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Chapter 1: Real Numbers 

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