You have been provided with three test tubes. Sodium carbonate and carbon dioxide are evolved when sodium hydro carbonate is heated. Slaked lime Ca (OH)2. (d) A Metals and nonmetals class 10: The NCERT Solutions for Class 10 Science is designed to provide a strong foundation for further studies in science. (b) Less than 5 The liquid sample is [CCE 2014] Solution: 2Al (s) + 3H2SO4 (aq) → Al2 (SO4)3 (aq) + 3H2 (g), (d) Iron filings + Dilute hydrochloric acid > Ferric chloride + Hydrogen 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). Question 11 HCl, HNO3, etc. The whole book is subdivided into four topics namely, Materials, The World of the Living, How Things Work, Natural Phenomena and Natural Resources or in the way of discipline we can state them in Chemistry, Biology, Physics and Environmental Science respectively. The reaction of an acid and a base, giving rise to the corresponding salt and water is called neutralization reaction. Why do HCl, HNO3, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character? 2NaOH + CO2 → Na2CO3 + H2O, Salt is formed by combination of acid and base through neutralization reaction. Even after revising all the chapters, students need to solve sample papers to score high marks. For example, when we wet the red litmus paper with the basic solution, it changes into blue colour. (a) Antibiotic (d) KCl NCERT Solutions for Chapter 8 - How do Organisms Reproduce? Dry HCl gas does not give H+ ions and therefore does not change the colour of dry litmus paper. Answer: Answer: Name the sodium compound, which is used, for softening hard water. Name the substance which on treatment with chlorine yields bleaching powder. When a given amount of an acid is added to water, there is a fixed number of hydronium ions per volume of the solution. (b) Analgesic The acid produces hydrogen ions only in the presence of water. e.g NaHCO3 + HCl → NaCl + H2O + CO2 Ans: A coin and feather when dropped in vacuum falls simultaneously due to free fall as there is no external resistance in vacuum. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. If the direction of the field and that of the current are mutually perpendicular to each other, then the force acting on the conductor will be perpendicular to both and will be given by Fleming’s left-hand rule. Which gas is usually liberated when an acid reacts with a metal? How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted ? But, with help of technology, it can converted into Bio-gas, which is an efficient and pollution free fuel. 2. Carbonic acid provides hydrogen ions, H+ (aq) and carbonate ions, CO(aq)32to rainwater. Thus, it will not affect the pH of the solution. Answer: (iv) Now pour alcohol in the beaker and switch on the current. Publisher : Janak. So, when water is added to plaster of Paris, it sets into a hard mass in about half an hour. Lactic acid present in it reduces its pH value. NaOH (solution B) is a base which turns red litmus blue. And the presence of the hydrogen gas can be tested by bringing a burning splinter/ matchstick near the gas produced. When the concentrated solution of an acid is diluted by mixing water, the concentration of hydronium ions H3O+ per unit volume decreases. Take some zinc granules in the test tube. A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. A generator converts mechanical energy into electrical energy. Book : Science. The pH will change to below 6, as lactic acid is formed when milk turns into curd. As previously stated, Environment Science part is covered in the Biology syllabus. Solution: 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. Following substances are poured in all the four test tubes. (d) Petri dish is not required for doing experiment of pH. Solution: Q1. Question 8. You have two solutions A and B. What is a neutralization reaction? 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 14 Question 4 Answer: (d) Petri dish Add about 5 mL dilute hydrochloric acid slowly. (d) Gas will not evolve in the case of IV set up as NaOH does not react with sodium carbonate. The solution which turns the blue litmus paper to red will be the acidic solution. Question 7 (b) Vinegar Bleaching powder. 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. Why should curd and sour substances not be kept in brass and copper vessels? Question 1. H+ ions in aqueous solution are responsible for acidic character. What is a neutralisation reaction ? Sodium carbonate. The pH of solution A is 6 and pH of solution B is 8. Hence, due to the presence of carbonic acid which provides ions to rainwater, the rainwater conducts electricity. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid ? It is the fixed number of water molecules present in one formula unit of a salt e.g. (b) II Question 1 Answer: NaOH (Solutions). Solution: (i) Neutral? Solution: Diluting an acid should be done by adding concentrated acid to water gradually with stirring and not by adding water to concentrated acid. Question 2 Answer: For example, cow dung used initially had low calorific value, and combustion of it causes lot of pollution. The clear supernatant solution turns the pH paper yellowish orange. (b) HCl Explain your answer. (c) III (b) Dropper Plaster of Paris has a very remarkable property of setting into a hard mass on wetting with water. Question 2 Question 20 Uses of washing soda : This shows that alcohols and glucose are not acids. (b) II Explain why? The setting of plaster of Paris is due to the hydration crystals of gypsum, which set to form a hard, solid mass. Class 10 Science NCERT Solutions of Chapter 4 is about Carbon which is versatile element found in many organic and inorganic compounds. Question 3 [CCE 2014] While diluting an acid it is recommended that the acid should be added to water and not water to the acid because if water is added to concentrated acid to dilute it, then a large amount of heat is evolved at once. Give two examples. The blue litmus paper formed here can now be used to test the acidic solution. The acidic behaviour of acids is due to the presence of hydrogen ions, [H+ (aq) ions], in them. Solving CBSE Sample Papers for Class 10 Science gives a brief idea on question paper pattern, marking scheme and types of questions asked in the exam. (iii) Strongly acidic? A student performed an experiment using zinc granules and sodium carbonate with sodium hydroxide and hydrochloric acid under different Answer: (a) Red litmus solution (d) As NaCl is a neutral solution due to its complete ionization in H2O and has pH = 7. H2 gas is not soluble in water. Question 16 (iii) Test for H2 gas : On dilution, the number of hydronium ions per volume decreases and concentration decreases. Since agamogenesis maintain the attribute within the population and make the relation with identical traits as gift in the oldsters. (iii) The solution which has no effect on any litmus paper will be neutral and hence it will be distilled water. (i) Hydrogen (H2) gas is liberated when an acid reacts with a metal. Question 24 CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. As the answers are prepared by Studyrankers experienced experts, you can trust the answer and use it for improving your marks in the examinations. The reaction will be vigorous with [CCE 2014] CuSO4.5H2O, Na2CO3.10H2O. Plaster of Paris should be stored in a moisture-proof container. 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