Rules for writing a chemical equation: For example: Question 10. It is an actual degradation of the metal as it renders the metal useless of its usual metallic character. After some time it is observed that white silver chloride turns grey. (a) What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? This is due to the decomposition of silver chloride into silver and chlorine by light. Skeltal chemical equation are unbalanced. Observations: Question 7. 5. State the physical conditions of reactants in which reaction between them will not take place. Certain changes in energy in the environment have to be made of heat, light or electricity breaking bonds of the compound. (ii) Combustion of coal in air 1. (8 marks). Answer; Reducing agent = CO, (c) Practice Now. answer: Answer: Also a brown substance will be deposited on the iron nail. Oxidation is a process which involves. Write balanced chemical equations for the following reactions: This substance is nothing but copper metal. The overall pH of the products when a strong acid and a strong base undergo a neutralization reaction will be 7. (a) ‘X’ is Calcium oxide (CaO). (i) State two observations made in the experiment. Putting the symbols and formulae of all the substances in the above words gives equation, Question 8. (a) In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode? (iii) The process of respiration. For example, the barium ions (Ba2+) of barium chloride react with sulphate ions (SO42-) of sodium sulphate to form barium sulphate (Ba2+ SO42- or BaSO4). What is electrolytic decomposition? Examples of an exothermic reaction are rusting iron, settling, chemical bonds, explosions, nuclear fission whereas some examples of an endothermic reaction are melting ice, evaporation, cooking, gas molecules, photosynthesis. Question 1. Write balanced chemical equations for the following statements: (iii) Heating of limestone. How is exothermic reaction different from an endothermic reaction? Ans: Describe an activity to show a decomposition reaction in which light is used to decompose a reactant. Fe2O3 (s) + 2Al (s) → 2Fe (l) + Al2O3 (l) + Heat. Dec 04, 2020 - Previous Year Questions with Solutions - Chemical Reactions and Equations, Class 10, Science | EduRev Notes is made by best teachers of Class 10. Consider the example of the neutralization reaction between Hydrochloric acid and Sodium Hydroxide giving out sodium chloride(Common Salt) and water. Answer. (ii) What type of reaction is this? Chemical Reaction. Write the balanced chemical equation with the state symbols of the following reaction: Solutions of Barium chloride and Sodium sulphate in water react to give insoluble Barium sulphate and the solution of Sodium chloride. Answer: Solid calcium oxide was taken in a container and water was added slowly to it. (iii) On heating green ferrous sulphate crystals, reddish brown solid is left as residue and a gas having smell of burning sulphur is evolved. (c) Carbon dioxide is passed through lime water. Write the balanced chemical equation for this reaction and state (i) the substance oxidized and (ii) the substance reduced in the reaction. It means a balanced chemical equation has equal masses of various elements in reactants and products. This video is highly rated by CBSE/Schools students and has been viewed 2 times. Question 15. (a) addition of oxygen. Ch 6 - Life Processes - Assertion Reasoning Type Questions 4. (ii) Excess of carbon dioxide gas is passed through lime water. c) Decomposition reaction: A Decomposition reaction is a reaction in which a single component breaks down into multiple products. State the kind of chemical reactions in the following examples:  (2014) (i) Solid calcium oxide was taken in a container and water was added to it. What is the sole of oxidizing agent is a reaction? Write chemical equation of the reaction and state its one use. Here, an acid and a base, Hydrochloric acid and Sodium Hydroxide react in a neutralization reaction to produce Sodium Chloride(Common Salt) and water as the products. Pre Foundation Question banks are helpful for students aspiring for NTSE, Olympiad, KVPY, IIT JEE, Medical and other engineering and competitive exams. Question 12. The subscript of an element represents the rate of the number of atoms. Ch 3 - Metals and Non-Metals (MCQs) 8. Answer: Substance reduced = Fe2O3 The balanced chemical equation is: 2Mg(s) + O 2 (g) 2MgO(s) Yes, magnesium (Mg) gets oxidised to form magnesium oxide (MgO) in this reaction. The pre foundation courses offered by us are prepared by best faculties from all over India. Free Online MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. b) Neutralization reaction: It is basically the reaction between an acid and a base giving salt and water as the products. Considering the case of a double displacement reaction: 4. Cbse Papers Questions Answers Mcq Class 10 Science Ch1 Chemical Reactions Equations. (iii) CaO + H2O → Ca(OH)2 (iii). Question 14. (2012) What happens chemically when quick lime is added to water? Answer: Consider 4 elements A, B, C & D. In a single displacement reaction, the mechanism would be as follows. (a) This document is highly rated by Class 10 students and has been viewed 101266 times. (ii) Substance reduced = CuO (Copper oxide). Answer: Question 3. Lime is used as a reagent in laboratories for dehydration, precipitation, etc. B. Slaked Lime. Let us consider the example of an electrochemical cell-like redox reaction between Zinc and Hydrogen. The colour of the crystals changes due to the formation of ferric oxide. Answer: This element is found in our bones also. Since water (H2O) consists of 2 parts of hydrogen and 1 part of oxygen, so, the volume of hydrogen gas (H2) collected over cathode (negative electrode) is double the volume of oxygen gas (O2) collected over anode (positive electrode). Use: This reaction is used in black and white photography. The best ways to excel in school exam as well as in JEE & NEET is to practice questions good questions , entrancei prepared question bank for class 10 students in chapter Chemical Reaction And Equation get Exercise-1 in this page Take about 2 g silver chloride in a china dish. Required fields are marked *, Chemical Reactions And Equations Class 10 Questions Answers. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. When limestone is heated strongly, it breaks into CO2 and lime. (iii) Heating of limestone (ii) This is a double displacement reaction. (2012) Class 10 Answerkey for Chemical Reaction and Equation. Oxidising agent = MnO2 7. Quick lime reacts vigorously with water to produce slaked lime with the release of large amount of heat. (2 marks). The entire NCERT textbook questions have been solved by best teachers for you. Why chemical equations are balanced? That is why here we have provided Chemical reactions and equations Class 10 Questions Answers so that students can effectively improve their learning and give out a better effort for the CBSE board exam. (2012) Answer: Fe 2 O 3 (s) + 2Al (s) → 2Fe (l) + Al 2 O 3 (l) + Heat Free PDF download of Important Questions with solutions for CBSE Class 10 Science Chapter 1 - Chemical Reactions and Equations prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Silver bromide also decomposes to silver and bromine by light. Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agents in the following reaction: (vi) 3H2 (g) + N2 (g) → 2NH3 (g) C) Yellow. (c) removal … The displacement reaction of iron (III) oxide with aluminium is known as thermite reaction. … We hope the given KSEEB SSLC Class 10 Science Solutions Chapter 1 Chemical Reactions and Equations will help you. (i) Dilute HCl cannot be kept in aluminium container because aluminium metal reacts rapidly with dil HCl to form aluminium chloride and hydrogen gas. (b) addition of hydrogen. Explain the process of corrosion and rusting. Identity X and also write the chemical reaction involved. The arrow sign (→) pointing towards the right hand side is put between the reactants and products. Students can solve NCERT Class 10 Science Chemical Reactions and Equations Multiple Choice Questions with Answers … (2014) (2 marks). Question 9. We conclude that they thoroughly mix with each other and form a new substance. Thus packing oil and fatty foods with nitrogen and fatty foods will help to sustain the quality of the food for longer by removing the oxygen before packing. Thus, it is a type of exothermic decomposition reaction. Also See : CBSE Class 10 Science Syllabus 2019-2020 Session There are several steps which need to be noted when balancing a chemical reaction, let us look at them one by one. Question 4. Extra Question Answers Class 10th Ch-1 (Chemical Reaction and Equations). Ans: Quicklime also known as calcium oxide has multiple applications. Al2O3 + NaOH → NaAlO2 + H2O (2013) Ch 1 - Chemical Reactions & Equations (MCQs) 6. Science Important Questions Class 10 are given below. Question 4. Question 3. During digestion, the complex food is broken into simpler form. Question 1. Likewise, if you add a spoon of curd to lukewarm milk and keep it aside for few hours, then the whole milk turns into curd. (a) What is meant by balanced chemical equation? Consider the example of the decomposition of calcium carbonate giving out CaO (Quick Lime) which is a major component of cement. (vi) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is formed. Chemical Reactions and Equations Chapter Wise Important Questions Class 10 Science NCERT Solutions Sample Papers NCERT Exemplar Solutions . Answer: When light falls on pale yellow coloured silver bromide, it changes to greyish white due to the formation of silver metal. Question 2. Rust can be termed with the chemical formula of Iron Oxide with its general form formula being Fe2O3.nH2O. Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. (b) Mention the colour of : So this is an oxidation reaction. Name the type of reaction taking place. (a) x → (s); y → (aq); (b) x → 2Ag. An exchange of ions takes place in this reaction. Add coefficients to the compounds or elements in the chemical reaction so that the number of atoms on both sides of the reaction matches up for all the constituent elements. Find all questions & answers on the chapter with detailed explanation chemical equations & more@learnfatafat.com (iii) Name the oxidising agent. Substance oxidised = CO a) Redox reaction: A REDuction-OXidation reaction is a reaction in which there is a transfer of electrons between chemical species. Science Class 10 Important Questions are very helpful to score high marks in board exams. 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