Question 9: What is aqua regia ? (b) Give reason for the following: Hydrogen chloride gas cannot be dried over quicklime. (iii) Ammonia gas. Answer the following questions: (i) Name the gas G. (ii) Name two chemicals used in the preparation of the gas G. (iii) Write the chemical equations for the reaction of the chemicals named in (ii) when : (a) The reaction mixture is not heated. (iv) The drying agent used is concentrated sulphuric acid. Lead nitrate solution is mixed with dilute hydrochloric acid and heated to give a white precipitate of lead (I) chloride. Removing metal stains and rust from the iron sheets. (iii) The colour of water that has entered the round bottomed flask is red. 16. Your email address will not be published. Why ? The covalent compound ionises in water because of its polar nature and it can conduct electricity. (ii) What type of reaction is taking place when chlorine acts as a bleaching agent ? (ii) A white precipitate of silver chloride is formed which is soluble in ammonium hydroxide. When passed into lime water, forms a milky white precipitate of calcium carbonate. The laboratory preparation of hydrogen gas usually involves the action of dilute sulphuric acid or dilute hydrochloric acid on zinc granules. (d) When ammonium hydroxide is brought near the mouth of HCl, dense white fumes are formed due to the formation of ammonium chloride. HNO3 reacts to form hascent chlorine which reacts with Gold or Platinum to form their respective soluble chlorides. The Selina Solutions for the academic year 2020-21 will be updated soon. HCl gas gives thick white fumes of ammonium chloride when glass rod dipped in ammonia solution is held near the vapours of the acid. (ii) Give balanced chemical equation for the above reaction. (c) Give a balanced equation for the reaction: Conc. Answer: (i) HCl gas can be dried by passing it over conc. Visit official Website CISCE  for detail information about ICSE Board Class-10. (a) Hydrogen chloride gas being highly soluble in water is dried by conc.sulphuric acid. Answer: (i) Fountain experiment. HCl is also formed by the chlorination of hydrocarbons. Why ? Above 200°C. 2. The gas gives dense white fumes when a glass rod dipped in ammonia solution is held near the gas. When Lead nitrate Pb(NO3)2 solution is mixed with dilute hydrochloric acid (2HCl) and heated to give a white precipitate of lead (I) chloride (PbCL2). Answer: This is because hydrogen chloride gas has an affinity for water, hence, when the stopper is opened it immediately reacts with water vapour present in the atmosphere which leads to the formation of fumes. (b) When hydrogen chloride is collected by downward delivery or upward displacement, it shows that it is heavier than air. The colourless gas is evolved at the cathode and a greenish gas is evolved at the anode. (v) The role of inverted funnel in the arrangement is : (a) Prevents back-suction of water. Return to Concise Selina Solutions for ICSE Chemistry Class-10, Linear Inequations ML Aggarwal Solutions ICSE Maths Class-10, Factorization ML Aggarwal Solutions ICSE Class-10th Maths, OP Malhotra Linear Programming ISC Class-12 Maths Solutions Ch-28, OP Malhotra Linear Regression ISC Class-12 Maths Solutions Ch-27, OP Malhotra Application of Integrals ISC Class-12 Maths Solutions…, OP Malhotra Application of Calculus in Commerce and Economics ISC…, OP Malhotra The Plane ISC Class-12 Maths Solutions Ch-24, OP Malhotra Three Dimensional Geometry ISC Class-12 Maths Solutions…, Privancy Policy | Sitemap | About US | Contact US, Hydrogen Chloride ICSE Class-10 Concise Chemistry Selina Solutions, Concise Selina Solutions for ICSE Chemistry Class-10. Pour 4 molar HCl into the voltameter and pass direct current. Quick summary with stories Question 4: Study the figure given below and answer the questions that follow: (i) Identify the gas Y. The given set up of the figure is for preparation of an acid. The precipitate is insoluble in nitric acid but soluble in ammonium hydroxide. Question 5: The given figure shown is for the preparation of an acid. (a) Anhydrous HCl is poor conductor due to the absence of ions in it whereas aqueous HCl is excellent conductor since it contains ions. When cone, hydrogen chloride is added to manganese dioxide, greenish yellow gas (Cl2) is liberated. Sulphuric acid. Answer: Sodium is not used to prepare hydrogen from acids because sodium metal is highly reactive. (b) Name the gas which produces dense white fumes with ammonia gas. Give three distinct tests (apart from using an indicator) you would carry out with solution of HClto illustrate the typical properties of an acid. Therefore, it is not collected over water. Mangnese oxide. This constant boiling mixture cannot be separated into its constituents by simply distilling. 20. When copper sulphide is treated with dilute hydrochloric acid, black coloured copper sulphite turns to blue colour by evolving hydrogen sulphide gas with the rotten egg odour. (i) Draw a diagram to show the arrangement used for the absorption of HCl in water. (c) What would you see when hydrogen chloride is mixed with ammonia ? Q9. (ii) Write the equation for the reaction. (a) Sodium carbonate on treating with dil.HCl results in the formation of sodium chloride with the liberation of carbon dioxide gas. Why is this drying agent chosen. (d) Phosphorous pentoxide and calcium oxide are good drying agents, but they cannot be used to dry hydrogen chloride gas because they react with hydrogen chloride. The chemical equation for this reaction is as follows: 3. It is seen that a colourless gas is evolved at cathode and a greenish gas is evolved at anode. Question 2: Hydrogen chloride gas cannot be dried over quick time. Answer: (i) (a) Hydrogen chloride gas (b) Sulphur (ii) Oxidation reaction. (iii) Which two colourless gases combine to form a white solid. (a) A Black metallic oxide which reacts with hydrochloric acid to give a coloured solution. (b) Write the equation for the reaction of concentrated hydrochloric add with Pb3O4. Why ? Use of Fountain Experiment . Answer: (i) The gas G is hydrogen chlorine gas. (b) Give the balanced equation for the reaction. nitric acid gives nascent chlorine. Why ? (iii) Balanced chemical equations for the laboratory preparation of HCl gas: (a) Rewrite the correct statement with the missing word/s:Aqua regia contains one part by volume of nitric acid and three parts by volume of hydrochloric acid. Why ? This indicates the absence of H+ ions in toluene showing thereby that hydrogen chloride is a covalent compound. (c) When aqueous solution of ammonia is taken in the jar of hydrogen chloride, it forms dense white fumes of ammonium chloride. (e) The chemical in which gold can be dissolved. Therefore, this experiment proves that hydrochloric acid contains both hydrogen and chlorine. Required fields are marked *, ICSE Class 10 Chemistry Selina Solutions Chapter 8 Study Of Compounds Hydrogen Chloride. H2SO4. The equation for this experiment is. Manganese dioxide (MnO2),  red lead and  Lead(IV) oxide (PbO2) react with conc.

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