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ICSE Class X Notes 2020 : Chemistry (Chatrabhuj Narsee Memorial School (CNM), Mumbai) Worksheet : Identification of anion

6 pages, 43 questions, 6 questions with responses, 6 total responses,

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Std :X Shri Vile Parle Kelavani Mandal's C.N.M. School & N.D. Parekh Pre-Primary School CHEMISTRY WORKSHEET 2019 2020 ANION TEST (A) Sr. 1. BY ADDING DILUTE SULPHURIC ACID. Experiment Salt + dil. Sulphuric acid Pass the gas through lime water 2. Observation Brisk effervescence of a colourless odourless gas, which turns lime water milky. Inference (name and formula of the radical) ------------------------------------radical present Salt + dil. Sulphuric acid ---------------------------------Bring a moist lead acetate paper near the gas. Sulphide (S - -) present ---------------------------------------------------------------------------------------------------------------------------------------- 3. Salt + dil. Sulphuric acid (warm if necessary) Effervescence of a colourless, pungent gas, Pass the gas through acidified potassium dichromate solution Which turns acidified potassium dichromate solution green ------------------------------------radical present -----------------------------------------------------------------------------------------------------------------------------------------Chemistry Page 1 of 6 (B) Sr. 1a) BY ADDING CONCENTRATED SULPHURIC ACID. Experiment Salt + conc. Sulphuric acid. Warm it gently. Bring a glass rod dipped in ammonium hydroxide near the gas 1b) Salt + MnO2 + conc. Sulphuric acid 1c) Salt solution + Silver nitrate solution Observation Colourless gas with pungent odour is evolved Dense white fumes. Inference (name and formula of the radical) -------------------------------------Gas evolved -------------------------------------radical present Greenish yellow gas with pungent odour is evolved which turns moist starch iodide paper blue black and then bleaches it. White precipitate which dissolves in excess of ammonium hydroxide -------------------------------------Gas evolved -------------------------------------radical present -------------------------------------Precipitate obtained -------------------------------------radical present 2a) Salt +Cu+ conc. Sulphuric acid. Warm it gently. 2b) Salt solution + freshly prepared ferrous sulphate. Add conc. Sulphuric acid slowly from the sides of the test tube Reddish brown fumes evolved A brown ring of nitroso ferrous sulphate appears at the junction of the two liquid layers. Nitrate (NO3 - ) present -------------------------------------radical present -----------------------------------------------------------------------------------------------------------------------------------------Chemistry Page 2 of 6 (C) TEST FOR SULPHATE ION. Sr. Experiment 1. Salt solution + Barium chloride solution Observation White precipitate insoluble in conc. HCl Inference (name and formula of the radical) -------------------------------------radical present ANSWER THE FOLLOWING QUESTIONS: Question1. Name the anion present in each of the following compounds: (1) A compound when warmed with conc. Sulphuric acid gives a gas which fumes in moist air and which gives dense white fumes with ammonia. ________________________________________________________________________ (2) A compound when warmed with dil. sulphuric acid gives a gas which turns acidified potassium dichromate solution green. ________________________________________________________________________ (3) Addition of dil. HCl to this salt produces a gas which turns moist lead acetate paper silvery black. ________________________________________________________________________ (4) When freshly prepared ferrous solution is added to a salt solution followed by conc. sulphuric acid, a brown ring is formed. ________________________________________________________________________ (5) Addition of dil HCl to salt produces a colourless odourless gas which turns lime water milky. ________________________________________________________________________ -----------------------------------------------------------------------------------------------------------------------------------------Chemistry Page 3 of 6 Question 2. Identify the gas evolved: (1) An alkaline gas which gives dense white fumes with hydrogen chloride. ________________________________________________________________________ (2) A gas which has an offensive smell like rotten eggs. ________________________________________________________________________ (3) A greenish yellow gas which also bleaches. ________________________________________________________________________ (4) A colourless odourless acidic gas which turns lime water milky. ________________________________________________________________________ Question 3. Distinguish by a chemical test: (1) Sodium carbonate and sodium sulphate Reagent added Effect on sodium carbonate Effect on sodium sulphate Dilute hydrochloric acid A colourless, odourless gas is evolved which turns lime water milky. No such gas evolved. (2) Sodium chloride and sodium sulphite Reagent added Effect on _________________ Effect on _________________ -----------------------------------------------------------------------------------------------------------------------------------------Chemistry Page 4 of 6 (3) Zinc chloride solution and zinc nitrate solution Reagent added Effect on _________________ Effect on _________________ Question 4. Complete the following table and write your observations: Hydrogen sulphide Hydrogen chloride Chlorine Sulphur dioxide Ammonia Shake the gas with red litmus solution Shake the gas with blue litmus solution Bring a glass rod dipped in ammonium hydroxide near it -----------------------------------------------------------------------------------------------------------------------------------------Chemistry Page 5 of 6 Question 5. The question (1) to (5) refers to the following salt solutions listed (a) to (g) a) b) c) d) e) f) g) Copper nitrate Iron (II) sulphate Iron (III) chloride Lead nitrate Magnesium sulphate Zinc chloride Sodium sulphite (1) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution? ________________________________________________________________________ (2) Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution? ________________________________________________________________________ (3) Which two solutions will give a white precipitate when treated with either dilute hydrochloric or sulphuric acid? ________________________________________________________________________ (4) Which solution becomes deep inky blue when excess of ammonium hydroxide is added to it? ________________________________________________________________________ (5) Which solution gives a white precipitate with excess ammonium hydroxide solution? ________________________________________________________________________ -----------------------------------------------------------------------------------------------------------------------------------------Chemistry Page 6 of 6

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