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Also, learn how fertilisation happens and find out about the role of DNA in reproduction. This chapter tells you about how evolution took place and the various pieces of evidence of evolution. NCERT Science Class 10 Chapter 9 takes you through evolutionary relationships which can be helpful during the classification of animals.

Study this chapter to understand how fossils can be used for finding more information about living and non-living species. You need to understand the laws of reflection and laws of refraction correctly to answer the 17 questions in this chapter. Find out how light plays an important role in enabling human beings to experience the sense of vision.

In addition, this chapter will help you understand the formation of images by spherical mirrors. Study the properties of convex mirrors and concave mirrors. Our NCERT solutions for Class 10 Science can be useful for learning the laws of refraction and the concepts related to refraction such as optical density and refractive index. Here, your understanding of the human eye and eye defects such as hypermetropia and myopia will be assessed.

The chapter deals with topics such as refraction of light through the atmosphere, refraction of light through a prism and scattering of light.

This chapter gives you in-depth knowledge of the human eye. Find out about the components of the human eye which give you the ability to see objects which are close to you and those which are at a distance from you. Learn about refractive defects that require correction for enabling better vision.

The Electricity Class 10 NCERT Solutions consist of questions related to resistance, the flow of current in an electrical circuit, heating effects of electrical power, etc. Revise the importance of resistance of a conductor. Also, practise NCERT solutions for Class 10 Science to understand the concept of series combinations of resistors and parallel combinations of resistors.

The NCERT solutions for Class 10 Science Chapter 13 will help you to write about magnetism covering topics such as magnetic field, magnetic field lines, etc. Revise the concept of the right-hand thumb rule. Find out what happens when electrical devices are placed in a magnetic field. Also, learn how you can produce electricity with the help of magnets. In addition, the NCERT solutions for Class 10 Physics will support you with answering questions based on the types of generators and electromagnetic induction.

Learn about the conventional as well as non-conventional sources of energy. At TopperLearning, you will find correct NCERT solutions of 10th Class Science for questions asking about the advantages of natural gas, disadvantages of fossil fuels, different forms of energy, alternative sources of energy etc. Energy is necessary to support several applications. Chapter 14 discusses the different sources of energy that are available in various forms.

Read our NCERT solutions for Class 10 Science Chapter 14 to understand the sources of energy in terms of their availability and advantages and disadvantages. Study about the enhancements in energy production and usage to prevent pollution and to ensure sustainability.

The NCERT Class 10 Science textbook solutions for this chapter also give you information about sustainable sources of energy such as solar energy. The different types of energy covered in this chapter are geothermal energy, nuclear energy, thermal energy, etc.

This chapter is related to the environmental concerns facing the world. The 9 questions in this chapter cover the food chain, various ecosystems, waste management, etc. This is an important chapter shedding light on the fact that all the living and non-living elements are inter-connected. In this chapter, you will find NCERT solutions of 10th Class Science to 7 questions on the importance of natural resources, water conservation, and conservation of natural resources.

Study our NCERT solutions for Class 10 Science Chapter 16 to revise answers on how natural resources can be managed efficiently with action plans for sustainable development.

Understand the issues related to the conservation of natural resources and how some of these issues can be solved with the recycle-reuse-reduce approach for sustainability. Our solutions are placed in a chapter-wise format for quick last-minute prep before your pre-board exam, mock tests or final exam. Resolve your doubts in Science with our experts and use our extensive study materials including NCERT 10 Science solutions to aim for high marks in your Science board exam.

Which of this is acidic and which one is basic? Answer: A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. Since solution A has more hydrogen ion concentration, solution A is acidic and solution B is basic. If yes, then why are these basic? But these are far less in number than OH � ions that is responsible for their basic nature.

Question 4 Under what soil condition do you think a farmer would treat the soil of his fields with quick lime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate? Answer: If the soil is too acidic having low pH then it is treated with materials like quick lime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate. Question 1 What is the common name of the compound CaOCl 2? Answer: Bleaching powder.

Question 2 Name the substance which on treatment with chlorine yields bleaching powder. Answer: Slaked lime Ca OH 2. Question 3 Name the sodium compound which is used for softening hard water. Answer: Sodium carbonate. Question 4 What will happen if a solution of sodium hydrogen carbonate is heated. Give the equation of the reaction involved? Answer: Solution of sodium hydrogen carbonate on heating gives sodium carbonate and carbon dioxide gas is evolved.

Question 5 Write an equation to show the reaction between plaster of Paris and water. Question 1 A solution turns red litmus blue, its pH is likely to be a 1 b 4 c 5 d 10 Answer: d Question 2 A solution reacts with crushed-egg shells to give a gas that turns lime water milky.

Question 4 Which one of the following types of medicines is used for treating indigestion? Question 6 Compounds such as alcohol and glucose also contain hydrogen but are not categorised as acids. Describe an activity to prove it. The bulb does not glow in this case also. This shows that alcohols and glucose are not acids. Question 7 Why does distilled water not conduct electricity, whereas rainwater does? Answer: Distilled water does not conduct electricity because it does not contain any ionic compound like acids, bases or salts dissolved in it.

Rainwater, while falling to the earth through the atmosphere, dissolves an acidic gas carbon dioxide from the air and forms carbonic acid H 2 CO 3. Hence, due to the presence of carbonic acid which provides ions to rainwater, the rainwater conducts electricity. Question 8 Why do acids not show acidic behaviour in the absence of water? The acid produces hydrogen ions only in the presence of water.

So in the absence of water, an acid will not form hydrogen ions and hence will not show its acidic behaviour. Which solution is a Neutral b Strongly alkaline c Strongly acidic d Weakly acidic e Weakly alkaline Arrange the pH in increasing order of hydrogen ion concentration. Question 10 Equal lengths of magnesium ribbons are taken in test tubes A and B. In which test tube will the fizzing occur more vigorously and why? Answer: Fizzing will occur more vigorously in test tube A.

Being strong acid, the hydrochloric acid solution contains a much greater amount of hydrogen ions in it due to which the fizzing will occur more vigorously in test tube A containing hydrochloric acid. The fizzing is due to the evolution of hydrogen gas which is formed by the action of acid on the magnesium metal of magnesium ribbon.

Question 11 fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer. Answer: pH of milk falls below 6 as it turns into curd due to the formation of lactic acid during this process. Lactic acid present in it reduces its pH value. Question 12 A milkman adds a very small amount of baking soda to fresh milk. Answer: a Milk is made slightly alkaline so that it may not get sour easily due to the formation of lactic acid in it.

Question 13 Plaster of Paris should be stored in a moisture proof container. Explain why? Answer: Plaster of Paris should be stored in a moisture proof container because the presence of moisture can cause slow setting of plaster of Paris by bringing about its hydration.

This will make the plaster of Paris useless after sometime. Question 14 What is a neutralisation reaction? Give two examples. Answer: The reaction between an acid and a base to form salt and water is called a neutralisation reaction.

Question 15 Give two important uses of washing soda and baking soda. Answer: Uses of washing soda : i Washing soda is used in glass, soap and paper industries. Uses of baking soda : i Baking soda is used as an antacid in medicines to remove acidity of the stomach. One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. Solution: The contents of each test tube would be identified by change in colour of red litmus paper.

For example, when we wet the red litmus paper with the basic solution, it changes into blue colour. Put the changed blue litmus paper in the solution which turns the blue to red will be the acidic solution. The solution, which has no effect on any litmus paper, will be neutral and hence it will be distilled water. Question 2 Why should curd and sour substances not be kept in brass and copper vessels? Solution: Curd and other sour foodstuffs contain acids, which can react with the metal of the vessel to form poisonous metal compounds which can cause food poisoning and damage our health.

Question 3 Which gas is usually liberated when an acid reacts with a metal? Solution: When an acid reacts with metal, a salt and hydrogen gas is formed. Question 4 Metal compound A reacts with dilute hydrochloric acid to produce effervescence.

Solution: The gas that extinguishes a burning candle is carbon dioxide, which is formed by the action of dilute hydrochloric acid on a metal carbonate and produces effervescence. Now, since one of the compounds formed is calcium chloride, it shows that the metal compound is calcium carbonate.

Thus, the metal compound A is calcium carbonate CaCO 3. Calcium carbonate reacts with dilute hydrochloric acid to form calcium chloride, carbon dioxide and water. This can be written as:. The compounds such as glucose and alcohol also contain hydrogen but they do not show acidic character. Question 6 Why does an aqueous solution of acid conduct electricity? Solution: The aqueous solution of an acid conducts electricity due to the presence of charged particles called ions in it.

Question 7 Why does dry HCl gas not change the colour of the dry litmus paper? Solution: Dry HCl gas does not contain any hydrogen ions in it, so it does not show acidic behaviour. Question 8 While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

Solution: Diluting an acid should be done by adding concentrated acid to water gradually with stirring and not by adding water Ncert Solutions For 10th Science Translation to concentrated acid. The heat is evolved gradually when a concentrated acid is added to water for diluting an acid and the large amount of water is easily absorbed. If, however, water is added to concentrated acid to dilute it, a large amount of heat is evolved at once.

The heat generated may cause the mixture to splash the acid on our face or clothes and cause acid burns. Question 10 How is the concentration of hydroxide ions OH- affected when excess base is dissolved in water? Solution: When the solution of a base is diluted by mixing more water in it, the concentration of hydroxide ions OH � ions per Ncert Solutions For Class 10th Ch 6 Life Processes Science App unit volume decreases.

Question 11 You have two solutions A and B. Updated on Apr 3, - a. Ask Mr AL Share. Table of contents. Chapter No. Latest Articles. Read More. View All News and Articles. Bihar board 10th toppers list has been released along wit Kendriya Vidyalaya Pune Admission - Check the admission p Inspire Scholarship - Know eligibility criteria, dates, c View All Latest Articles. Explore Popular Degree, Branches and Courses.

Browse by Degrees. Sc Nursing Bachelor of Science in Nursing. Browse by Courses. Computer Science Engineering. Mechanical Engineering. Civil Engineering. Information Technology. Electrical Engineering. View All Courses. Showing 29 out of 29 Questions. Souhrid Sarkar 23rd Mar, It is available in the form of district-wise marks lists , consisting of registration numbers and marks of all students.

Along with the NTSE stage 1 result, cutoff and merit list of selected candidates is also released. The students those who have cleared the stage 1 exam are eligible to seat for the stage 2 exam which is going to be held on June 13, The scholarship will be given to the students who will pass the stage 2 examination. Answer later. Manisha 31st Jan, A candidate can appear for maximum three attempts. Yash Dev Student Expert 15th Jan, Feel free to comment if you've any doubt Good luck.

Parmeshwar Suhag 3rd Jan, Shubham Dhane 4th Nov, Hello, The 10th CBSE board exam will be conducted in offline mode only, These board exams will not be conducted in online mode.

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