PDF download free. Name the gas evolved when zinc reacts with dil. it is a Free PDF download of Important Questions with Answers for CBSE Class 10 Science Chapter 1 – Chemical Reactions and Equations prepared by expert Science teachers from latest edition of CBSE(NCERT) books only by CoolGyan to score more marks in CBSE board … Answer the following Identify the substance =X‘ and write the chemical Which dissolved in water, it forms magnesium hydroxide, which action of dilute HCl on sodium carbonate. 13. Contents. •   Oxidation of Copper to Copper Oxide solution: Cu(s) + 2AgNO3(aq) →Cu(NO3)2(aq)+2Ag(s) Write the reaction of the substance ‘X’ named in (i) above with water. •    An arrow separates the reactants from the products. •   A substance that loses oxygen or gains hydrogen is known as an oxidising agent. Company Accounts and Analysis of Financial Statements, Part A – Fundamentals of Human Geography, PART-2 Politics in India since Independence, PART-B Politics in India since Independence, CBSE Class 10 Science Chapter-1 Chemical Reactions and Equations Important Questions – Free PDF Download. What will happen to the coin products are quite different from the reactants. 5. (i)  Decomposition Reaction: A single compound decomposes or break down to give two or moresimpler substances. So,oxidation of food items need to be prevented to Fe2 O3 (s) + •   Decomposition reaction: In a decomposition reaction, a single reactant decomposes to give two or more products. 3 CSO4 + 2B → B2(SO4)3 + 3C CaCO3(s) + H2O(l) + CO2 (g) → Ca(HCO3)2(soluble). (i)  Important Questions for Class 10 Science Chapter 1 – Chemical Reactions And Equations PDF Now, the board has also introduced the Multiple Choice Questions in Science exam. By Gurmeet Kaur Mar 3, … Write the Balanced chemical equation. Oxidation of oils or fats in a flood, resulting into a bad smell and taste. What is the sole of oxidizing agent is a reaction? ZIET CHANDIGARH. iii) By filling nitrogen in the food storage bags. The Ans. Chemical change cannot be reversed back because products so formed in a chemical reaction are totally different from the reactants. (d) Lead is getting reduced. Potassium bromide→Potassium metal + Bromine •   Thermal decomposition of Ferrous Sulphate. Iron metal + Copper(II) sulphate → Iron(ii) sulphate + copper metal Corrosion in case of Iron is known as Rusting. So the solution will turn blue due to the formation of copper nitrate. Explain with suitable examples. Why a combustion reaction an oxidation reaction? – Boiling Ans. Balance chemical reaction with state symbols are as follows-, i. BaCl2(aq) + Na2SO4 (aq)  BaSO4 (s) + 2NaCl (aq), ii. NaOH (aq) + HCl (aq)  NaCl (aq) + H2O, 18. Which of the following statement about the reaction below are incorrect? Displacement Reaction: A more reactive element [metal] displaces less reactive elemen [metal] from its aqueous salt soln Fe (s) + ZnSO4 (aq)      → Ans. iii) Presence of moisture (water). Chlorine gas + Sodium metal →Sodium chloride Check important chemical reactions and diagrams based on which questions are expected to be asked in the CBSE Class 10 Science Paper 2020. 2 Cu + O2  is basic in nature, 7. An iron knife kept dipped in a blue copper sulphate solution turns the blue solution light green.  → •   Double displacement reaction b/w Sodium Sulphate & Barium Chloride. So, it displaces Cu from CuSO4 solution and Why? Explain by giving examples. Chapter 8 – Chemical Reactions Notes Chemical Reactions: Chemical reactions are processes in which the atoms of one or more substances are rearranged to form different chemical compounds. A water insoluble substance =X‘ on reacting with dilute H2SO4 released a colourless taste and become rancid. Refrigeration of food stuf, •   A chemical reaction involves a chemical change in which substances react to form new substances with entirely new properties. 3O2 →2Fe2O3 (rust). •   In terms of electronic concept, Oxidation is defined as a loss of electrons while reduction is defined as a gain of electrons. 1 Class 10 Science – Chapter wise Important Questions. •   Chemically, rust is hydrated ferric oxide (Fe2O3.xH2O) Carbon dioxide is produced by the of corrosion act as protective layer. The arrow head points towards the products and indicates the direction of the reaction. H2(g) + Cl2(g) sunlight →2HCl (g). Link of our facebook page is given in sidebar. The symbolic representation of a chemical reaction is called a  + What change Features of a chemical equation: •    The reactants are written on the left hand side with a plus sign between them. A solution of a substance ‘X’ is used for white washing. Synthesis of ammonia. Give one example of a combination reaction in which an element combines with a a) Which element is most reactive? Most of the students usually complain that the chemical reaction and equation Chapter in Chemistry, Class 10 can get really very difficult and complicated. Ans. 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Ans. Aluminium foil do not corrode in atmosphere even if kept for a long time because a protective coating of aluminium oxide (Al2O3) is formed on the surface of the foil and stops any further reaction of the metal with air and water thus food particles do not get spoiled. For example Your email address will not be published. insoluble calcium carbonate which dissolves on passing excess CO2 due to •   While balancing a chemical equation, the molecular formulas of the reactants and products should not change. molecules so that they may combine to form the products. Iron ➣  Chemical Change: (green), 4. Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l). A compound used for whitewashing is. equation. chemical equation. 3. Chapter 1 Chemical Reactions and Equations Class 10 Science Important Questions and Answers PDF will help you in scoring more marks. Rusting of Iron : When iron and iron objects are exposed to atmosphere, they are attacked 7. 1.1 Class 10 Science Important Questions- Acids, Bases & Salts; 1.2 Class 10 Science Important Questions- Carbon; 1.3 Class 10 Science Important Questions- Chemical reaction; 1.4 Class 10 Science Important Questions- Control; 1.5 Class 10 Science Important Questions- Electricity; 1.6 Class 10 Science Important Questions … Oxygen Ans. The brown coloured element ‘X‘ is copper. 2CuS + O2  2CuO. A copper coin is kept in a solution of silver nitrate for some time. Ans. If heat is absorbed from the surroundings, then such a reaction is known as endothermic reaction. is the source of energy in the form of photons. 1. Sulphur What is a chemical equation? •   The process of equating the number of atoms on both the sides of a chemical equation is known as balancing of a chemical equation. D. Limestone. 2.Formation of a precipitate  NaCl (aq) – Old bonds are broken, new bonds are formed. reactions. Why cannot a chemical change be normally reversed? Chapter 1 Chemical Reactions. Ans. does actually happen? HCl (aq) 5. i.  H2O (l) Save my name, email, and website in this browser for the next time I comment. B. Slaked Lime. •   Advantages of corrosion: Though corrosion is undesirable, it can be advantageous in case of aluminium which on exposure to air, gets coated with Identify the type of chemical reaction The oxidizing agent supply the oxygen in a … Ans. As statement (a) and (b) are incorrect, answer (i) is correct. 6. Pb(NO3)2 + 2 KI (aq) Identify the compound oxidized in the following reaction. Magnesium 10. Blue litmus paper remained blue. 9. •   Exothermic and endothermic reactions: If heat is evolved during a reaction, then such a reaction is known as Exothermic reaction. 19. •   If a substance gains oxygen or loses hydrogen during a reaction, it is said to be oxidised. Write down the reaction involved. Ahmad took a magnesium ribbon (cleaned) and burned it on a flame. The DIAZONIUM (C6H5N2Cl) is prepared by treating the ice-cold solution of … Ans. X= Fe, Y = Cu, Displacement reaction. Ans. Ans. X = Calcium oxide (Quick lime), Combination reaction. •   The first step in balancing a chemical equation is to write the number of atoms of each element present on the left hand side and right hand side. Chapter 2: Acids, Bases and Salts. 14. •   Physical change: If a change involves change in colour or state but no new substance is formed, then it is a physical change.•   Chemical change: If a change involves formation of new substances, it is a chemical change. and the colour of the solution? NCERT Solutions for Class 10 Science Chapter 1 let the students solve and revise the whole syllabus very effectively. We have covered all the Class 10 Chemistry important questions and answers in the worksheets which are included in CBSE NCERT Syllabus. What do you understand by precipitation reaction? Ans: We know that copper is more reactive than silver, so it will displace silver from its salt compound to give you a new compound. CBSE NCERT Solutions For Class 10 … A substance X used for coating iron articles is added to a blue solution of a reddish brown metal Y,the color of the solution gets discharged Identify X and Y & also the type of reaction. would you observe in zinc rod? C. Blue vitriol. Why should a magnesium ribbon be cleaned before burning in air? When the gas was passedthrough water, the solution obtained turn blue litmus red . c Storing the food in air-tight containers. On heating in air it forms copper oxide, which is black in colour. gases like O2 ,CO2M etc. 6. CBSE Class 10 science Important Questions Chapter 1 – Chemical Reactions and Equations, Chapter 1 – Chemical Reactions and Equations, Chapter 5 – Periodic Classification of Elements, Chapter 10 – Light Reflection and Refraction, Chapter 11 – Human Eye and Colourful World, Chapter 13 – Magnetic Effects of Electric Current, Chapter 16 – Management of Natural Resources, Previous Year Question Paper for Class 10, Lakhmir Singh Class 10 Textbook Solutions, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Ans. 12. ii. carbon dioxide .it is a double displacement reaction Red litmus paper turned blue. – Melting – Boiling – Condensation – [Note- No change occurs in the identity of the substance]. Why is a Combustion reaction an oxidation reaction? 4. (b) Carbon dioxide is getting oxidized This protects the metal nderneath from further corrosion and damage. ii) When aqueous solution of sodium chloride is mixed with the aqueous solution of silver →  a chemical equation. This is called Rancidity. c) What happens when CO2 gas is passed through lime water and why does it (brown) 8. (a) marble chips react with dilute hydrochloric acid to form calcium chloride and According to new CBSE Exam Pattern, MCQ Questions for Class 10 Science pdf Carries 20 Marks. •   Oxidation is a chemical process in which a substance gains oxygen or loses hydrogen. b) Which element is least reactive ? 4. – Reactants lose their properties to form product of different properties. HCl. What type of reaction is this: Na2SO4 + BaCl2 → BaSO4 +2NaCl It is called rust which is mainly hydrated iron (III) oxide Fe2O3→xH2O. Ans. turns Red litmus blue, 2. It has displaced both ‘A’ and ‘c’ from their Ferrous Sulphate o Exothermic reactions give off energy (as in fire). It is a double displacement reaction. chloride, barium sulphate comes in the form of white precipitate 3 CO+ 2A→ A2O3 +3C •   We should always start balancing with the compound that contains maximum number of atoms. 9. •   As per the law of conservation of mass, the total mass of the elements present in the products of a chemical reaction is equal to the total mass of the elements present in the reactants. Lime water (calcium hydroxide) combines with carbon dioxide to form a suspension Ans. Important questions for class 10 science chapter 1- Chemical Reactions and Equations. ii) Presence of air (Oxygen). 2 Mg (s) + •   If a substance gains hydrogen or loses oxygen during a reaction, it is said to be reduced. ➣  Physical Change: Change in physical properties. •   Precipitation reaction: An insoluble solid known as precipitate is formed during a double displacement reaction. When carbon dioxide gas is passed through lime water, it turns milky due to the formation →Cu(s) + H2 O (l). equations of the reaction involved . Are you preparing for Exams? Represent decomposition of ferrous sulphate with the help of balanced chemical 2MgO (s)  •   Double displacement reaction b/w Lead Nitrate & Potassium Iodide. Sodium hydrogen carbonate → Sodium carbonate + Carbon dioxide + Water, Please send your queries to ncerthelp@gmail.com you can aslo visit our facebook page to get quick help. c. On passing CO2 gas through lime water, it turns milky due to formation of NCERT books Class 10 Science PDF (chapter-wise) in English, Hindi (Vigyan), and Urdu are provided as under: Class 9 Science NCERT Book Introduction; Chapter 1: Chemical Reactions and Equations; NCERT Solutions for class 10 Science. Balancing of a chemical equation is based on the law of conservation of mass. Do you need help with your Homework? This process is called rancidity. •   Rancidity can be prevented by: a Adding antioxidants i.e. of calcium carbonate which makes lime water milky. ➣   Corrosion: Process of slowly reacting up of metals due to attack of atmospheric 1. (c) Zinc granules ,identify the type of reaction when marble chips and Zinc granules A student took 2-3 g of a substance X in a glass beaker & poured water over it slowly. To prevent rancidity food items are flushed with nitrogen. (ii)Â, 2. Ans. helps in breaking the bonds & this leads to chemical reaction between hydrogen& chlorine. •   Combination reaction b/w Magnesium ribbon and Oxygen from air. Why? Download Notes Class 10 Chapter 1 Chemical Reactions And Equations In Pdf. formed on the surface. •   Rancidity: When oils and fats or foods containing oils and fats are exposed to air, they get oxidised due to which the food becomes stale and gives a bad aste or smell. 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