There total of 5 questions in each test. You can attend more and more test to evaluate your practice. Answers and explanation of each question is given just below the questions. If you have any doubt, please ask in discussion forum. The reaction between nitrogen and oxygen to form nitrogen monoxide is an endothermic reaction because heat is absorbed in this reaction.
Actually, when nitrogen and oxygen are heated to a very high temperature about degree Celsius, they combined to form nitrogen monoxide and a lot of heat is absorbed in this reaction. It is because, the standard state for hydrogen and oxygen is gas and for water is liquid at reaction temperature.
Helium or nitrogen both can be used for storage of fresh sample of an oil for a long time. These gases are called inert gases as they do not react with most elements including oxygen.
Thus, these gases create an inert environment for the oil and prevent its reaction with any element in the environment that prevent from getting it stale.
Lead acetate can be used in place of lead nitrate because lead acetate is also water soluble like lead nitrate. Lead iodide is unusually soluble in hot water and forms Ncert Solutions Of Class 10th Chapter 5 Test crystals on cooling.
Slaking of lime is an exothermic reaction because a large amount heat is produced during the reaction.
The heat can be felt by touching the beaker from outside. The resulting compound Ca OH 2, which is also called slaked lime, turns red litmus solution to blue and hence proves it to be a basic solution. Thus, the pH of this solution will be more than seven. Iron is getting oxidized and forming ferrous ferric oxide Fe3O4 4.
Water molecule is getting reduced to hydrogen ions. Water is acting as an oxidizing agent by donating its oxygen atom to Fe. This is a redox reaction because oxidation and reduction both are happening simultaneously. It is also a displacement reaction because H of NH3 is displaced by oxygen. A displacement reaction is also a redox reaction as it is always followed by oxidation as well as reduction. Note: When oxygen is added to a compound in a reaction, it is called oxidation.
Removal of oxygen from a substance during a reaction is called reduction. At this stage MCQs are important for the revision of concepts and missing terms related to the chapters. It means we have to revise the chapter again and again. Activities are important not only for MCQ, but the theoretical questions also. In CBSE exams, there were three questions based on activities.
MCQs are generally asked from with in the chapter text. There are 25 sets of MCQ tests containing total of questions with answers and explanation. We have uploaded all the questions carefully.
For any error, please take screen shot and send us for modification. Q1 In which of the following statements is or are incorrect? When calcium hydroxide solution lime water reacts with carbon dioxide gas a white precipitate of calcium carbonate is formed along with water.
When zinc metals react with dilute sulphuric acid to form zinc sulphate solution and hydrogen gas. During respiration glucose combines with oxygen in the cells of our body to form carbon dioxide and water along with the production of energy. The reaction between nitrogen and oxygen to form nitrogen monoxide is an an exothermic reaction. Explanation: The reaction between nitrogen and oxygen to form nitrogen monoxide is an endothermic reaction because heat is absorbed in this reaction.
Q2 In which of the following chemical equations the abbreviations represent the correct states of the reactants and products involved at reaction temperature? Explanation: It is because, the standard state for hydrogen and oxygen is gas and for water is liquid at reaction temperature.
Q3 Which of the following gases can be used for storage of fresh sample of an oil for a long time? Carbon dioxide or oxygen. Nitrogen or oxygen.
Carbon dioxide or helium. Helium or nitrogen. Explanation: Helium or nitrogen both can be used for storage of fresh sample of an oil for a long time. Q4 In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed.
While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate? Lead sulphate insoluble. Lead acetate. Ammonium nitrate. Potassium sulphate. Explanation: Lead acetate can be used in place of lead nitrate because lead acetate is also water soluble like lead nitrate. Q5 Boojho appeared in class test where he wrote some statements but he confused to know the correct statement.
Would you help him to know that? Some chemical reaction and are characterized by a change in colour. The purple colour of potassium permanganate solution disappears when citric acid reacts with potassium permanganate solution. The orange colour of potassium dichromate solution changes to green when sulphur dioxide gas is passed through acidified potassium dichromate solution.
All the above. Explanation: Here are all the statements are correct. Hence, your answer will be option [D]. Q6 Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime water. It is an endothermic reaction, and It is exothermic reaction.
It is exothermic reaction, and The pH of the resulting solution will be more than seven. It is an endothermic reaction, and The pH of the resulting solution will be less than seven.
The pH of the resulting solution will be more than seven, and The pH of the resulting solution will be less than seven. Explanation: Slaking of lime is an exothermic reaction because a large amount heat is produced during the reaction.
Q7 How do you come to know that a chemical reaction has taken place? Evolution of a gas. Formation of a precipitate. Change in colour, temperature and state. Q8 A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation? The color disappears due to dilution; no reaction is involved. Q9 Which of the following statements about the given reaction is correct?
Iron metal is getting oxidized, Water is getting reduced, Water is acting as reducing agent. Water is acting as reducing agent, Water is acting as oxidising agent. Iron metal is getting oxidized, Water is getting reduced, Water is acting as oxidising agent.
Water is getting reduced, Water is acting as oxidising agent. Explanation: Iron is getting oxidized and forming ferrous ferric oxide Fe3O4 4.
Displacement reaction, neutralisation reaction. Combination reaction, redox reaction. Displacement reaction, redox reaction. Redox reaction, neutralisation reaction. Explanation: This is a redox reaction because oxidation and reduction both are happening simultaneously. Start a New Test. MCQs can be asked from entire book, whether it is intext questions or end exercises questions.
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