(a) ‘X’ is calcium oxide (CaO). \(2 \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{s}) \stackrel{\text { heat }}{\longrightarrow} 2 \mathrm{PbO}(\mathrm{s})+4 \mathrm{NO}_{2}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g})\) The colour changes to reddish brown on heating due to formation of iron (III) oxide. Question 3. In electrolysis of water, why is volume of gas collected over one electrode double that of gas collected over the other electrode?   (AI 2009) Download free PDF of best NCERT Solutions , Class 10, Chemistry, CBSE- Chemical Reactions and Equations . On what basis is a chemical equation balanced?   (Foreign 2008) (ii) CaO(s) + H2O(l) → Ca(OH)2(aq) READ PAPER. Balance the following chemical equation: 2H2O → 2H2 + O2 (Balanced chemical equation). (i) Phosphorus burns in presence of chlorine to form phosphorus pentachloride. Name the reducing agent from the following reaction: Answer: The reaction between CaO (calcium oxide) and H2O is a combination reaction. For the reaction C2H4Br2 3KI C2H4 2KBr KI3 Initial rate data at 60 °C are [C2H4Br2] M [KI] The isoelectric point pI of a peptide is the pH at which the peptide does not migrate in an electr Select one a. (ii) MnO2 is getting reduced and HCl is getting oxidised. Question 38. (i) State the two observations made in the experiment. (a) ‘X’ is Na2SO4 and Y is BaSO4 Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)     (CBSE 2008C) (i) Physical state of reactants must be mentioned, e.g., (ii) Electric current is passed through water, Free PDF Download of CBSE Class 10 Science Chapter 1 Chemical Reactions and Equations Multiple Choice Questions with Answers. (1) ii) D G Mg Si metal semi-metal non-metal (2) iii) Any three of the following: Magnesium is a solid at room temperature, whereas D is a gas. Answer: Translate the following statement into chemical equation and then balance it. Balance the given chemical equation:   (AI 2008C) Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s). (iii) Pb(NO3)2(aq) + 2KI(aq) → Pbl2(s) + 2KNO3(aq) Answer: (CBSE 2011) (ii) Double displacement reaction (Precipitation reaction) (Northern Arizona University) and Raymond Chang, this success guide is written for use with General Chemistry. Give one example of a combination reaction which is also exothermic.   (CBSE 2011) The gas liberated is hydrogen and it can be tested by taking a burning matchstick near the mouth of the test tube in which reaction is taking place. (a) It is because heat is evolved during respiration. Question 30. Question 47. Answer: (iii) 2KClO3(S) → 2KCl(aq) + 3O2(g) (b) Write a balanced chemical equation for the reaction. → MgCl2(aq) + H2(g) It is also a double displacement reaction. Al(s) + CuCl2(aq) → AlCl3(aq) + Cu(s) (a) Define a balanced chemical equation. According to law of conservation of mass, matter can neither be created nor be destroyed in a chemical reaction. 20 Full PDFs related to this paper. Materials Required: Quicklime (calcium oxide), water, beaker. (ii) Name the type of chemical reaction taking place. Quick lime is CaO. Answer: Example 1. Answer: Chlorine is used in the manufacture of the corrector, which is a very volatile liquid. Answer: (ii) It can be prevented by packaging fat and oil containing foods in nitrogen gas. Write chemical equation. Answer: CuSO 4.5H 2 O (s) ⇋ CuSO 4(s) + 5H 2 O (g) (d) Displacement. All NCERT textbook questions have been solved by our expert teachers. It is thermal decomposition reaction. Mg(s) + 2HCl(dil.) (b) Copper can displace silver from AgN03 because copper is more reactive than Ag CaO(s) + H2O(l) → Ca(OH)2(aq) + heat Answer: Question 37. Question 43. What happens chemically when quick lime is added to water?   (CBSE 2008) Using a suitable chemical equation, justify that some chemical reactions are determined by: (b)  Hydrogen sulphide gas burns in air to give water and sulphur dioxide. Name the type of reaction. Answer: (c) What type of a reaction is this? Question 6. (ii) Sodium metal reacts with water to form sodium hydroxide and hydrogen gas.     (CBSE 2012) (iii) Formation of precipitate    (CBSE 2015) (b) The type of reaction Question 51. Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) “We need to balance a skeletal chemical equation.” Give reason to justify the statement.    (CBSE 2015) After few days, when zinc plate was taken out of the solution, a number of holes were observed on it. Answer: Metals are ductile. (c) Silver chloride is used in photography. (ii) 3BaCl2 + Al2(SO2)3 → 3BaSO4 + 2AlCl3 (i) 2KBr(aq) + BaI2(aq) → 2KI(aq) + BaBr2(aq) (b) Complete the following chemical equation Give an example of a decomposition reaction. (a) Explain two ways by which food industries prevent rancidity. (a)  Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. Rancidity is the process of oxidation of fats and oils that can be easily noticed by the change in taste and smell is known as rancidity. Question 48. (ii) CaCO3(s) → CaO(s) + CO2(g) It happens due to oxidation. Answer: Which products will be obtained when lead nitrate is heated simply. Given examples to support your answer.   (Foreign 2008) Giving an example list two information which make a chemical equation more useful (informative)     (CBSE 2015) (ii) Ca(OH)2 + HNO3 → Ca(NO3)2 + H2O Question 8. Therefore, when they undergo a chemical reaction, A will replace B, as it is more reactive, to form the compound AC. 2AgBr → 2Ag + Br2 In black and white photography AgBr gets decomposed due to light and forms silver metal and bromine gas. (iii) \(2 \mathrm{FeSO}_{4}(\mathrm{s}) \stackrel{\text { heat }}{\longrightarrow} \mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{s})+\mathrm{SO}_{2}(\mathrm{g})+\mathrm{SO}_{3}(\mathrm{g})\). \(\mathrm{CaCO}_{3} \stackrel{\text { heat }}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2}\) (CBSE 2015) ZnO + C → Zn + CO   (CBSE 2008) Answer: State the type of chemical reactions and chemical equations that take place in the following: Question 50. Answer: Answer: (i) Potassium bromide + Barium iodide → Potassium iodide + Barium bromide. (b) Which of the following statements is correct and why copper can displace silver from silver nitrate and silver can displace copper from copper sulphate solution.        (CBSE 2014) The reaction in which more reactive metal displaces less reactive metal. It is a double displacement reaction. Question 2. Hence, it is a precipitation reaction. Fe displaces Cu from CuSO4. Question 4. (CBSE 2012) Answer: (iii) Decomposition reaction These NCERT Solutions are crafted as per the latest CBSE syllabus 2020-21 by subject experts at BYJU’S. A zinc plate was put into a solution of copper sulphate kept in a glass container. Na2SO4 + BaCl2 → BaSO4 + 2NaCl Question 10. Magnesium has high melting and boiling points, whereas D has low melting and boiling points. Question 1. It states that ‘matter can neither be created nor be destroyed’. Question 45. (i) Name the salt. (i) CaO + H2O → Ca(OH)2 (ii) In desert plants the stomata are open at night. Access the answers to hundreds of Chemical reaction questions that are explained in a way that's easy for you to understand. Double displacement as well as precipitation reaction. B is given out in either an elemental or ionic form. (a) Write one example for each of decomposition reaction carried out with help of Combination reaction. Question 44. Answer: Identify the type of reactions(s) in the following equations. 7.63 Given the following equation: 2K + Cl2 -> 2KCl How many grams of KCl is produced from 4.00 g of K and excess Cl2? State two important observations and name the type of reaction taking place.   (CBSE 2012) (iii) NH3(g) + HCl(g) → NH4Cl(s) Question 33. Consider the following chemical reaction (b) Reaction (i) is a precipitation reaction because one of the product formed is insoluble in water. Question 52. Answer: 2KBr(aq) + Cl 2 (g) 2KCl(aq) + Br 2 (aq) d) i) They both have three occupied electron shells. (ii) It is a double displacement reaction. Touch the beaker. \(2 \mathrm{FeSO}_{4} \longrightarrow \stackrel{\Delta}{\longrightarrow} \mathrm{Fe}_{2} \mathrm{O}_{3}+\ldots+\ldots\) Answer: Is oxidation an exothermic or an endothermic reaction? Question 3. It is because properties of compound (H2O) are different from properties of its constituting elements, i.e., H2 and O2. Answer: Define combination reaction. Question 4. (i) List any two observations Students who are preparing for their Class 10 exams must go through NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations. (iii) Light (i) 2Mg(s) + O2(g) → 2MgO(s) Answer: The reaction in which oxygen is added or hydrogen is removed is called oxidation reaction. Answer: (i) Write a balanced chemical equation for process of photosynthesis. (CBSE 2009) (ii) Heating lime-stone in a lime kiln to form quick lime.       (Foreign 2009) Calcium oxide reacts with water vigorously to form calcium hydroxide with the evolution of heat. (i) CH4 + 2O2 → CO2 + 2H2O (iv) MnO2 + 4HC1 → MnCl2 + 2H2O + Cl2. (CBSE 2012) Answer: (i) Green colour of FeSO4 disappears and reddish brown solid is formed. (a)  Calcium hydroxide + Carbon dioxide →nCalcium carbonate + Water, (b)  Zinc + Silver nitrate → Zinc nitrate + Silver, (c)  Aluminium + Copper chloride → Aluminium chloride + Copper, (d)  Barium chloride + Potassium sulphate →nBarium sulphate + Potassium chloride, (a)  Potassium bromide (aq) + Barium iodide(aq) → Potassium iodide (aq) + Barium bromide(s), (b)  Zinc carbonate (s) → Zinc oxide (s) + Carbon dioxide (g), (c)  Hydrogen (g) + Chlorine (g) → Hydrogen chloride (g), (d)  Magnesium (s) + Hydrochloric acid (aq) → Magnesium chloride(aq) + Hydrogen(g). (iii) Ammonia and hydrogen chloride gases are mixed.     (CBSE 2015) Answer: (ii) Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)   (CBSE 2011) The reaction representing a chemical change is called a chemical reaction. Answer: (i) It is a double displacement reaction. Let us start by simply writing a chemical equation in terms of the formulas of the substances, remembering that both elemental hydrogen and chlorine are diatomic: (a) Why is respiration considered as an exothermic reaction? Cl 2 + 2KBr → 2KCl +Br 2. Name the product obtained, identify the type of reaction. (ii) \(2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \stackrel{\text { electrolysis }}{\longrightarrow} 2 \mathrm{H}_{2}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g})\) It is a precipitation reaction. Food should be kept in airtight container in refrigerator. What is redox reaction? HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O Question 42. (a) Double displacement as well as precipitation reaction. 2. Answer: (i) It is because zinc has displaced copper from CuSO4. Define a combination reaction. (b) Magnesium reacts with dil HCl Zinc metal has been used to form zinc sulphate, therefore, number of holes were observed. (iv) Displacement reaction. Answer: How can we know whether a reaction has taken place or not?   (Delhi 2010) Add water to it slowly. The process in which taste and smell of food containing oils or fats gets spoiled is called rancidity. Answer: (ii) Write the name and chemical formula of the product formed. You might have noted that when copper powder is heated in a china dish, the surface of copper powder becomes coated with a black colour substance. are metals. (i) Combination reaction In a double displacement reaction, two atoms or a group of atoms switch places to form new compounds. Name the compound involved. Ethane, C 2 H 6, reacts with oxygen to make carbon dioxide and water. (i) BaCl2 + H2SO4 → BaSO4 + HCl Allow the gas to pass through lime water which turns milky and confirms CO2 gas. Question 59. Answer: (iii) C6H12O6(S) + 6O2(g) → 6CO2(aq) + 6H2O(l) + energy. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Skeletal chemical equations are unbalanced. (b) \(2 \mathrm{FeSO}_{4} \stackrel{\text { heat }}{\longrightarrow} \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{SO}_{2}+\mathrm{SO}_{3}\) (i) Combustion reaction and oxidation reaction. For example, iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide. (iii) Combination reaction. \(2 \mathrm{FeSO}_{4} \stackrel{\text { heat }}{\longrightarrow} \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{SO}_{2}+\mathrm{SO}_{3}\), Question 9. (a) Balanced chemical equation has an equal number of atoms of different elements in the reactants and products. Answer: The following diagram displays a chemical reaction. (i) Magnesium wire is burnt in air. H2O → H2 + O2 (skeletal equation) Question 3. While TeO 2 and PoO 2 are non – volatile crystalline solids.. c) Ozone: It is unstable and easily decomposes into oxygen. How will the colour of the salt change? (ii) Burning of natural gas. Answer: Using the equation for electrolytic decomposition of water, differentiate between a skeletal chemical equation and a balanced chemical equation. (iii) Oxidation reaction: The reaction in which O2 is added or H2 is removed or loss of electrons takes place is called oxidation reaction. Solution: The answer is a combination reaction. Lead monoxide, nitrogen dioxide and oxygen gas will be liberated. Question 20. Why does the colour of copper sulphate solution change when an iron nail is dipped in it? Answer: The following observations in an activity may suggest that a chemical reaction has taken place: Question 22. Zwavelzuur - vroeger ook wel vitriool genoemd - is een industrieel belangrijk anorganisch zuur met als brutoformule H 2 SO 4.Onder standaardomstandigheden komt het voor als een kleurloze, geurloze, viskeuze en sterk hygroscopische vloeistof met een glasachtige glans, die volledig mengbaar is met water.Zwavelzuur wordt vrijwel altijd in de vorm van een waterige oplossing verhandeld en gebruikt. Get help with your Chemical reaction homework. Answer. (i) Silver bromide on exposure to sunlight decomposes into silver and bromine, They take CO2 at night and is Question 53. (i) Aluminium + Bromine → Aluminium bromide Name the type of chemical changes involved in the two cases. Question 54. (c) Slacked lime is formed with hissing sound and lot of heat is envolved, Question 62. The following observations in an activity may suggest that a chemical reaction has taken place: Question 12. Answer: It represents the reactants and products that are involved in the reaction. (ii) Write the name and chemical formula of the product formed. Write balanced chemical equation for the reaction. The reaction is precipitation reaction. It is a combination reaction. Answer: 2Cu + O2 → 2CuO, Question 35. Write balanced equation for the reaction between magnesium and hydrochloric acid. Question 31. Question 58. (ii) What type of reaction is this? It aims to help students hone their analytical and problem-solving skills by presenting detailed approaches to solving chemical problems. (ii) exothermic reaction, Question 32. (b) \(\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+2 \mathrm{KI}(\mathrm{as}) \longrightarrow \underset{\text { Yellow ppt. Solved the very best collection of Chemical Reactions and Equations Class 10 Science Important Questions and Answers Chapter 1 Pdf from the latest NCERT edition books, It will help you in scoring more marks in CBSE Exams. Answer: What is the colour of ferrous sulphate crystals? (ii) Pb(NO3)2 + 2Kl → Pbl2 + 2KNO3 Identify the displacement and the double displacement reaction from the following reactions. (b) It is because iron displaces copper from CuS04 to form FeS04 which is pale green. (b) Write the chemical equation of the reaction that takes place. Hydrogen and chlorine react to make HCl. What is an oxidation reaction? (a) A solution of substance ‘X’ is used for white washing. Question 1. Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion, yet water which is a compound made up of hydrogen and oxygen is used to extinguish fire. (iii) CaO + H2O → Ca(OH)2 The volume of gas collected over one electrode is double than that of the gas collected over the other electrode as the ratio of H : O in water is 2 : 1. (i) Yellow coloured precipitate is formed due to formation of lead iodide. MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O. How does this colour change after heating?   (CBSE 2012) Note down the observations. (i) Calcium oxide reacts vigorously with water to produce slaked lime and large amount of heat is released. (White ppt) 3. (a) 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) (ii) the substance reduced. (b) Pb(NO 3) 2 (aq) + 2KI(aq) Pbl 2 (s) + 2KNO 3 (aq) (c) It is a double displacement reaction. a chemical formula written over the arrow in a chemical equation signifies a) a by- product b) the formation of a gas ... + 2KBr(aq) = 2KCl+ Br₂(l) is a(n) a) synthesis reaction ... what is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions? 4. (i) Copper reacts with oxygen to form copper oxide which is black, i.e., oxidation of copper takes place What does it represent? (ii) Change in temperature (ii) \(\mathrm{Zn}(\mathrm{s})+\underset{\text { Blue }}{\mathrm{CuSO}_{4}}(\mathrm{aq}) \longrightarrow \underset{\text { Colourless }}{\mathrm{ZnSO}_{4}}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})\), Question 28. Answer: Answer: Answer: Yellow precipitate of lead iodide is formed. Question 7. It is also called double displacement reaction. }}{\mathrm{PbI}_{2}(\mathrm{s})}+2 \mathrm{KNO}_{3}(\mathrm{aq})\). (c) Identify the substance that is oxidised and reduced in the following reaction. (i) PbO getting reduced and C is getting oxidsed. (ii) CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) + heat energy (ii) Calcium carbon → Calcium oxide + Carbon dioxide
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