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For example, vanilla essence has characteristics pleasant smell in acid solution and no smell in alkali solution. Tap water contains some impurities in the forms of salts.
Due to presence of salts, it conducts electricity. Distilled water is free from all kinds of salts and hence does not conduct electricity. When an acid is mixed with water, there is evolution of large amount of heat. Therefore, acid is slowly added to water. If on the other hand, water is added to acid, it might spill on your body and clothes due to explosion and evolution of sudden and large amount of heat.
The rain water collected from city B is more acidic. Sugar present in chocolates and sweets gets broken to acids by bacteria present in the mouth. This lowers the pH in the mouth. Tooth enamel is made up of calcium phosphate, which gets corroded when the pH in the mouth is below 5. To prevent tooth enamel from decay, toothpaste is used because it is alkaline and neutralises the acid produced in the mouth and helps to prevent lowering of pH in mouth.
Bleaching powder is soluble in water. However, commercial samples of bleaching powder contains slaked lime that does not react with chlorine gas during the manufacture of bleaching powder. The insoluble part of bleaching powder is this white solid, i. Question 1: What is a neutralization reaction?
Give some examples. Answer 1: When the effect of a base is nullified by an acid and vice versa, it is called neutralization reaction. Question 2: An alkali is an important base used for the laboratory work. Name the base and state how it can be prepared from common salt? What is this process called? Answer 2: An important alkali commonly needed for laboratory work is sodium hydroxide. It can be prepared from sodium chloride by the process of electrolysis.
This is called chlor-alkali process. Electrolysis of aqueous solution of sodium chloride: When electricity is passed through an aqueous solution of sodium chloride commonly called brine, it decomposes into chloride and sodium.
Sodium is collected at the cathode where it reacts with water to form sodium hydroxide. Chlorine is formed at the anode and is collected as a gas. Question 1: a How does baking soda helps to make cakes and bread soft and spongy?
OR Give reason: cake rise on adding baking powder. Answer 1: a On heating , sodium bicarbonate decomposes to produce carbon dioxide. This causes biscuits and cakes etc. The other constituents act as preservatives. Question 2: Why does bleaching powder smell strongly of chlorine? Answer 2: Bleaching powder smells strongly of chlorine because it slowly reacts with carbon dioxide of air to evolve chlorine gas. Define indicators. Name two natural indicators obtained from plants. What are antacids?
What are olfactory indicators? Give an example. Tap water conducts electricity whereas distilled water does not. While diluting an acid, why is it recommended that the acid should be added to water and not water into the acid? What is meant by the term pH of a solution? Hence, NCERT text book questions are very important and must be gone through by each and every student. Study and economics are given for free download.
These questions will help you to revise the concepts learnt from the book. These text book questions are very helpful for better understanding of the concepts and formulas.
The chapter-end questions and answers given in NCERT books are very important not only for examination but also for better understanding of concepts. We strongly recommend that NCERT books must be gone through line by line and make proper notes for each chapter.
The students are now looking for online resources to study at home. There are a number of websites and mobile apps available over the internet. This �. Here all questions are solved with detailed explanation and available for free to check mycbseguide. These ncert book chapter wise questions and answers are very helpful for CBSE Ncert Maths Class 10th Pdf Not Work board exam.
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