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Lakhmir Singh Physics Class 10 Solutions Chapter 2

Class 12 Physics textbook must be properly finished � all the concepts must be clear and questions at the end of every chapter must be solved wolutions if you are appearing for board exams. Go through the solutions for every question and make sure you understand them properly. In this chapter, students will solutiosn about the derivation of laws of refraction cahpter reflection using Huygens law. Waves from a point source spread out in all directions, while the light class 10th physics chapter 2 ncert solutions us seen to travel along with narrow rays.

It required the insight and experiment ncegt Huygens, Young and Fresnel to understand how a wave theory could explain all aspects of the behaviour of light.

Along with that, students will also learn about the Brewster law and the angular width expression of the central maximum of the diffraction pattern. Besides the derivation and the theory, the numerical problems from various topics will be also explained in. Students must also take free mock su on Wave Optics on Embibe. Taking these mock tests will help students to analyze their understanding of Wave Optics.

Physics is an important subject as both engineering and medical aspirants need to prepare for the subject. If you are preparing for engineering or medical entrance exams, you can take the free medical and engineering entrance mock tests on Embibe.

While for board exams, finishing off the NCERT Class 12 textbooks is enough, for JEE and NEET, it is recommended you solve questions from some other sources as well as the questions asked in these exams are a bit more difficult than the ones asked in board exams. If you have any query regarding this article on Wave Optics NCERT Solutions, leave your questions in the comment box below and uss will class 10th physics chapter 2 ncert solutions us back to you class 10th physics chapter 2 ncert solutions us soon as possible.

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We have lots of study material written in easy language that is easy to follow. You can check out syllabus at cbse syllabus for class 10 How to use this page to learn class 10 science You are here in this page means you are looking for something to help you study Science of class So this page contains notes of most of the class 10 chapters and we also have assignments of most of the chapters that you can practice.

We also have a free class 10 E-book or pdf download page where you can download lots of files. So, to learn any chapter you have to follow these steps First read and understand the notes. Try to go through the solved examples of of the chapter you are reading Now it is the time to solve unsolved assignments and worksheets.

You will find plenty of them here or on the respective chapter page. You will also find ncert solutions for class 10 Science along with the notes, assignments , worksheets etc. All the best for better learning of your Science concepts.

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 unit volume decreases. Question 11 You have two solutions A and B. Solution: The pH of a solution is inversely proportional to its hydrogen ion concentration.

This means that the solution having lower pH will have more hydrogen ion concentration. In this case, solution A having a lower pH of 6 will have more hydrogen ion concentration. Solution A is acidic and solution B is basic. Solution: Acids produce hydrogen ions in water.

So, when an acid is added to water, the concentration of hydrogen ions in water increases. The solution of acid thus formed will have more of hydrogen ions and it will be acidic in nature. If yes, why are these basic? Question 14 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?

Solution: Most often the soil in the fields is too acidic. If the soil is too acidic having low pH , it is treated with materials like quicklime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate. Thus, a farmer should add lime or slaked lime in his fields when the soil is too acidic. Question 15 What is the common name of the compound CaOCl 2? Solution: The common name of the compound CaOCl 2 is bleaching powder.

Question 16 Name the substance that on treatment with chlorine yields bleaching powder. Solution: Calcium hydroxide is the substance that on treatment with chlorine yields bleaching powder. Question 17 Name the sodium compound, which is used, for softening hard water. Solution: Sodium carbonate washing soda is used for softening hard water.

Question 18 What will happen if a solution of sodium hydro carbonate is heated? Give the equation of the reaction involved. Sodium carbonate and carbon dioxide are evolved when sodium hydro carbonate is heated.

Question 19 Write an equation to show the reaction between plaster of Paris and water. Solution: Plaster of Paris has a very remarkable property of setting into a hard mass on wetting with water. So, when water is added to plaster of Paris, it sets into a hard mass in about half an hour. The setting of plaster of Paris is due to the hydration crystals of gypsum, which set to form a hard, solid mass.

Question 20 Why does distilled water not conduct electricity, whereas rainwater does? Solution: Distilled water does not conduct electricity because it does not contain any ionic compound like acids, bases or salts dissolved in it. On the other hand, rain water conducts electricity.

This can be explained as follows: Rain water, 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. So, due to the presence of carbonic acid which provides ions to rain water , the rain water conducts electricity. Question 21 Why do acids not show acidic behaviour in the absence of water? Solution: The acidic behaviour of acid is due to the presence of hydrogen ions.

The acids will not show its acidic behaviour in the absence of water, this is because the acids produce hydrogen ions only in the presence of water. Which solution is? Arrange the pH in increasing order of hydrogen-ion concentration. Question 23 Equal lengths of magnesium ribbons are taken in test tubes A and B.

In which test-tube will fizzing occur more vigorously and why? Fizzing occurs in the test tube due to the evolution of hydrogen gas by the action of acid on magnesium ribbon. Since hydrochloric acid is a strong acid a large amount of hydrogen gas is liberated in the test tube A.

So fizzing occurs more vigorously in test tube A. Question 24 Fresh milk has a pH of 6. Solution: The pH will change to below 6, as lactic acid is formed when milk turns into curd.

Question 25 Plaster of Paris should be stored in a moisture-proof container. Solution: The presence of moisture can affect the slow setting of plaster of Paris by bringing about its hydration. This will make the plaster of Paris useless after some time.

Question 26 What is a neutralization reaction? Solution: The reaction of an acid and a base, giving rise to the corresponding salt and water is called neutralization reaction. Question 27 Give two important uses of washing soda and baking soda.

Solution: Washing soda 1. It is often used as an electrolyte. Domestically it is used as a water softener during laundry. Baking soda 1. It is used to test garden soil for acidity. If it develops bubbles, the soil is too acidic. Washing a car with it can remove dead bug bodies without damaging the paint. Question 1.

Equal pieces of zinc granules are dropped in four test tubes. Following substances are poured in all the four test tubes. Question 2.

Which of the following statements shows the property of an acid? Thus, it has no effect on red litmus and acids are sour in taste.

Question 3. A drop of a liquid sample was put on the pH paper. It was observed that the colour of the pH paper turned blue. The liquid sample is [CCE ] a lemon juice b sodium bicarbonate solution c distilled water d hydrochloric acid Answer: b The liquid sample is of sodium bicarbonate NaHC 3 solution. It is a basic solution. And we know that a basic solution turns pH paper blue.

Question 4. Two solutions X and Y were found to have pH value of 4 and 10 respectively. Question 5. A student was asked to collect apparatus from lab store, for doing experiment of pH of given sample. Identify the article which he is not supposed to pick. Question 6. Which one of the following would you need to identify the gas that evolve when you heat NaOH solution with zinc metal?

The gas will burn with a pop sound confirming the presence of hydrogen gas. Question 7. A solution has pH value of 5. On adding 10 mL of NaCl to it, what will be the pH of the new solution?

Thus, it will not affect the pH of the solution. Hence, the pH of the solution will remain unaffected. Question 8. A salt is dissolved in water. The pH of this salt solution was found to be 7 by measuring the pH with a universal indicator paper. Question 9. A student performed an experiment using zinc granules and sodium carbonate with sodium hydroxide and hydrochloric acid under different conditions as shown below.

In which set up, no gas is evolved? Question Four set ups as given below are arranged to identify the gas evolved when dilute hydrochloric acid was added to zinc granules. Which is the most appropriate set up? HCl Solution A and dil. NaOH Solutions. The following observations were reported by the 4 students. The sign ����. NaOH solution B is a base which turns red litmus blue. A sample of soil is mixed with water and allowed to settle.

The clear supernatant solution turns the pH paper yellowish orange. Which of the following would change the colour of this pH paper to greenish blue?

So, an antacid would change the colour of this pH paper to greenish blue. Other options a and b contain acids and option c is a neutral salt. Salt is formed by combination of acid and base through neutralization reaction. CuSO 4. Plaster of Paris CaSO 4.

Washing Soda Na 2 CO 3. These are the substances which indicate the acidic or basic nature of the solution by their colour change. Always add acid to water and not water to acid because this process is highly exothermic.

The acid must be added slowly to water by constant shirring on. Adding water to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns. If you have any query regarding this article or Science Class 10 Chapter 2 Acids And Bases, drop your comments in the comment box below and we will get back to you as soon as possible. Page Number: 22 Question 1 Why should curd and sour substances not be kept in brass and copper vessels?

Therefore, the reaction between calcium carbonate and hydrochloric acid is Page Number: 25 Question 1 Why do HCl, HNO 3 , etc show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

If we take 20 mL of the same solution of NaOH, the amount of HC1 solution the same solution as before required to neutralise it will be a 4 mL b 8 mL c 12 mL d 16 mL Answer: d 16 mL Question 4 Which one of the following types of medicines is used for treating indigestion? Examples: Question 15 Give two important uses of washing soda and baking soda.

Solution: Question 23 Equal lengths of magnesium ribbons are taken in test tubes A Class 10th Physics Chapter 2 Ncert Solutions Pdf and B. In disinfecting water. Common Salt NaCl: Main source is sea water. Also exists in the form of rock hence also known as rock salt. Important component of food.

Strength of Acids and Bases in Solution Some animals like bee and plants like nettle secretes highly acidic substance for self defense. The pH of mouth should be more than 5. The optimum pH range for human body is 7 to 7.

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