Chapter -1 CHEMICAL REACTIONS AND EQUATIONS NCERT CLASS 10th EXERCISE QUESTIONS SOLUTION

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Chapter -1 CHEMICAL REACTIONS AND EQUATIONS
EXPLANATION OF NCERT EXERCISE QUESTIONS

PLAYLIST Chapterwise solution -    • Видео  
PLAYLIST of question answer -    • Видео  

In this session we will be starting with the chapter "Why Do We Fall Ill ?".
We will cover the In-between Question/Answers and exercise questions.
✔️ Class: 10th
✔️ Subject: Chemistry
✔️ Chapter 1: Chemical Reactions and Equations

CLASS 10th NCERT CHAPTER & EXERCISE QUESTION & ANSWER

अध्याय-1 रासायनिक क्रियाएं और समीकरण कक्षा 10वीं एनसीईआरटी अध्याय और अभ्यास प्रश्न और उत्तर, एनसीईआरटी अभ्यास प्रश्नों की व्याख्या
एनसीईआरटी अध्याय और अभ्यास प्रश्न और उत्तर
कक्षा 10वीं एनसीईआरटी विज्ञान

adhyaay-1 raasaayanik kriyaen aur sameekaran kaksha 10veen enaseeeeaaratee adhyaay aur abhyaas prashn aur uttar, enaseeeeaaratee abhyaas prashnon kee vyaakhya
enaseeeeaaratee adhyaay aur abhyaas prashn aur uttar
kaksha 10veen enaseeeeaaratee vigyaan

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1. Why should a magnesium ribbon be cleaned before it is burnt in air?
2. Write the balanced equation for the following chemical reactions.(i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen
3. Write a balanced chemical equation with state symbols for the following reactions. (i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. (ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
1. A solution of a substance 'X' is used for white washing.(i) Name the substance 'X' and write its formula.(ii) Write the reaction of the substance 'X' named in (i) above with water.
2. Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.
1. Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
2. Give an example of a double displacement reaction other than the one given in Activity 1.10.
3. Identify the substances that are oxidised and the substances that are reduced in the following reactions.(i) 4Na (s) + O2 (g) → 2Na₂O (s)(ii) CuO (s) + H2 (g) → Cu (s) + H₂O (I)
1. Which of the statements about the reaction below are incorrect? 2PbO (s) + C (s) → 2Pb (s) + CO2 (g) (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c) Carbon is getting oxidised. (d) Lead oxide is getting reduced. (i) (a) and (b) (ii) (a) and (c) (iii) (a), (b) and (c) (iv) all
2. Fe2O3 + 2AI→ Al2O3 + 2Fe The above reaction is an example of a (a) combination reaction. (b) double displacement reaction. (c) decomposition reaction.(d) displacement reaction. 3. What happens when dilute hydrochloric acid is added to iron filings? Tick the correct answer. (a) Hydrogen gas and iron chloride are produced. (b) Chlorine gas and iron hydroxide are produced. (c) No reaction takes place. (d) Iron salt and water are produced.
4. What is a balanced chemical equation? Why should chemical equations be balanced?
5. Translate the following statements into chemical equations and then balance them.(a) Hydrogen gas combines with nitrogen to form ammonia.(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
6. Balance the following chemical equations.(i) 2HNO3 + Ca(OH)2→ Ca(NO3)2 + 2H2O (ii) 2NaOH + H2SO4 → Na2SO4 + 2H2O (iii) NaCl + AgNO3→ AgCl + NaNO3 (iv) BaCl2 + H2SO4 → BaSO4 + 2HCI