Solution: Plaster of Paris should be stored in a moisture proof container. NCERT Solutions For Class 10 Science Chapter … (ii) Illustration : Set up the apparatus as shown in the given figure. Which gas is usually liberated when an acid reacts with a metal ? Edition : 2070-2071. Theses chapters are divided into 5 units. This means that the solution having lower pH will have more hydrogen ion concentration. A drop of a liquid sample was put on the pH paper. (d) lemon juice Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH3COOH) is added to test tube B. Author : Government Of Nepal How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted ? Charcoal obtained from wood is better fuel than wood. (d) Both X and Y are bases 7. (b) Less than 5 NCERT Solutions for Chapter 1 - Chemical Reactions and Equations, NCERT Solutions for Chapter 2 - Acids, Bases and Salts, NCERT Solutions for Chapter 3 - Metals and Non-metals, NCERT Solutions for Chapter 4 - Carbon and its Compounds, NCERT Solutions for Chapter 5 - Periodic Classification of Elements, NCERT Solutions for Chapter 6 - Life Processes, NCERT Solutions for Chapter 7 - Control and Coordination. Why does dry HCl gas not change the colour of the dry litmus paper ? • Na2CO3 + 10H2O → 4 Na2CO3. Question 5 Domestically it is used as a water softener during laundry. String Data Manipulation Long Answer Type Questions (8 Marks) Question 1. Solution: Why does distilled water not conduct electricity, whereas rainwater does? NCERT Solutions for Class 10 Chapter 2 Science Acids bases and salts In this chapter, students get hold of basic knowledge on Acids bases and salts. The acids like HCl, H2SO4, HNO3 and CH3COOH, etc., show acidic character because they dissociate in aqueous solutions to produce hydrogen ions, H+(aq) ions. (UP 2007, 15) Or The pH of a solution is inversely proportional to its hydrogen ion concentration. HCl (Solution A) and dil. For example, when we wet the red litmus paper with the basic solution, it changes into blue colour. (c) Any solution having pH > 7 will be a base while the solution having pH < 7 will surely be an acid. Why do acids not show acidic behaviour in the absence of water ? Which of the following statements shows the property of an acid? Why does dry HCl gas not change the colour of the dry litmus paper? Since hydrochloric acid is a strong acid a large amount of hydrogen gas is liberated in the test tube A. [CCE 2015 ]. (i) Baking soda is used as an antacid in medicines to remove acidity of the stomach. Question 18 (c) It has no effect on red litmus Answer: fresh milk has a pH of 6. Bleaching powder. More the concentration of H+ ions, higher the acidic nature of the solution. Explain. Some animals like bee and plants like nettle secretes highly acidic substance for self defense. Answer: Four students I, II, III and IV were asked to examine the changes for blue and red litmus paper strips with dil. (a) Na2CO3 Answer: Identify the article which he is not supposed to pick. It is often used as an electrolyte. 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 (H2CO3). Answer: Which one of the following would you need to identify the gas that evolve when you heat NaOH solution with zinc metal? (e) E Question 11. Solution: CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? … ii. Candidates who are searching for NCERT Solutions for Class 10 Science Chapter 3 Metals And Non Metals questions and answers can … 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). The pH of solution A is 6 and pH of solution B is 8. NCERT Solutions for Class 10 Science Chapter 5- Periodic Classification Of Elements. (a) I Question 5. Lower pH of sour & sweet food can cause tooth decay. NCERT Exemplar Problems Class 10 Science Solutions in PDF format are available to download for new academic session 2020-2021 and Download NCERT books -2020-21 or download NCERT Solutions along with the answers of book. A student performed an experiment using zinc granules and sodium carbonate with sodium hydroxide and hydrochloric acid under different Which is the most appropriate set up? (i) Washing soda is used in glass, soap and paper industries. indicates no colour change. This NCERT Solutions has questions-related to an electric cell, electric bulb, electric circuits, switches, conductors and insulators, examples of conductors and insulators. Question 9 The concept of live wire, neutral wire and earth wire is discussed. Q1. In which test tube will the fizzing occur more vigorously and why ? A milkman adds a very small amount of baking soda to fresh milk. (b) Why does this milk take a long time to set as curd ? So, when water is added to plaster of Paris, it sets into a hard mass in about half an hour. (a) 1 [NCERT Exemplar] Earth wire, insulated green which provide, passage for leakage of current. (b) It is sour in taste If you want to score maximum marks in the examination the every chapter is important for you. Solution: 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 Question 10. Question 2 (c) 12 mL Since solution A has more hydrogen ion concentration, solution A is acidic and solution B is basic. The aqueous solution of an acid conducts electricity due to the presence of charged particles called ions in it. Answer: For example, cow dung used initially had low calorific value, and combustion of it causes lot of pollution. NCERT Class 10 Science Chapter 5- Periodic Classification of Elements is categorized under Unit Chemical Substances – Nature and behavior. Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test-tube A while acetic acid (CH3COOH) is added to test-tube B. The gas evolved extinguishes a burning candle. 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. When an acid reacts with metal, a salt and hydrogen gas is formed. Hydrochloric acid → Magnesium chloride + Hydrogen (a) D Solution: Why does an aqueous solution of an acid conduct electricity ? Sodium Hydroxide (NaOH) (a) Neutral Do basic solutions also have H+(aq) ions? (b) Salts which are completely ionisable in water are said to be neutral salts and their pH is equal to 7. Here we have given Class 10 Science NCERT Solutions Chapter 2. Class 10 Science NCERT Solutions of Chapter 4 is about Carbon which is versatile element found in many organic and inorganic compounds. The concentration of hydroxide ions will increase when excess base is dissolved in a solution of sodium hydroxide, but it happens to a limited extent only after which the concentration becomes almost constant. Question 11 September 15, 2020 by kseebsol KSEEB SSLC Class 10 Science Solutions Chapter 5 Periodic Classification of Elements are part of KSEEB SSLC Class 10 Science Solutions. Prepared by chlor alkali process . KOH + HCl → KCl + H20 As you will see exam pattern, CBSE is focusing more on objective type questions thus, we have prepared MCQs and also provided VSAQs so students can prepare accordingly. How is the concentration of hydroxide ions (OH–) affected when excess base is dissolved in a solution of sodium hydroxide ? Question 1. (b) 8 mL This can be written as: Question 5 Here we have given CBSE NCERT Exemplar Problems with Solutions for Class 10 Science. Question 6 Answer: September 27, 2019 by Veerendra. (d) dilute hydrochloric acid reacts with iron filing (b) HCl The solution which turns the blue litmus paper to red will be the acidic solution. How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted? (vi) Repeat the experiment with glucose. Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. 10H2O) : What would be the electron dot structure of carbon dioxide which has the formula CO 2? This shows that alcohols and glucose are not acids. NCERT Solutions For Class 10 Science Chapter 2 Acids And Bases:  In this article, we will provide you with NCERT Solutions For Class 10 Science Chapter 2 Acids And Bases. A generator converts mechanical energy into electrical energy. (b) dilute hydrochloric acid reacts with magnesium ribbon (d) All of the above RBSE Solutions for Class 10 Pdf download all subjects in both Hindi Medium and English Medium are part of RBSE Solutions. The clear supernatant solution turns pH paper blue molecules present in the beaker and on... With metal, a large amount of heat is evolved ( used in glass, soap & paper,. Will be acidic in nature ( iv ) now pour alcohol in the beaker and switch on the current 8... 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