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ICSE 10th Question Bank : Chemistry : Analytical Chemistry

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Analytical Chemistry Question 1: Give a test to distinguish between 1. Sodium carbonate and sodium sulphate 2. Potassium chloride and potassium nitrate 3. Copper carbonate and copper sulphate 4. Lead chloride and lead sulphate 5. Iron (II) sulphate and iron (III) sulphate 6. Calcium sulphate and zinc sulphate 7. Zinc sulphate and aluminium sulphate 8. Ammonium sulphate and ammonium chloride 9. Hydrated copper sulphate and anhydrous copper sulphate 10. Ammonium chloride and sodium chloride Question 2: Identify the following from the given list [Copper nitrate, Iron (II) sulphate, Iron (III) chloride, Zinc chloride, Magnesium sulphate, Lead nitrate] 1. Which two solutions will give white ppt when treated with dilute hydrochloric acid followed by barium chloride solution? 2. Which two solutions will give a white ppt when treated with dil HNO3 and AgNO3 solution? 3. Which solution will gave a white ppt when HCl or H2SO4 is added to it? 4. Which solution will become inky blue on addition of excess ammonia? 5. Which solution will give a white precipitate with excess ammonium hydroxide solution? Question 3: Substance A is water-soluble and gives a curdy white ppt, B with silver nitrate solution. B is soluble in ammonium hydroxide but insoluble in dil HNO3. Substance A reacts with ammonium hydroxide solution to give a white precipitate C, which is soluble in conc. Ammonia. Another solution of D is added to barium nitrate solution. A white ppt E is formed, which is insoluble in dil HCl or HNO3. A dirty green ppt F is formed on addition of ammonium hydroxide to a solution of D and the precipitate is insoluble in excess ammonia. The third sample G is a coloured salt, which on heating decomposes leaving a black residue; H. on addition of copper turning and concentrated H2SO4 to G produce a coloured acidic gas, J. A solution of G is added to NaOH solution until in excess, a pale blue ppt, I is obtained, which is insoluble in excess of sodium hydroxide, A solution of G is then added to NH4OH solution in excess to give an inky blue solution K, A solution of G is warmed and hydrogen sulphide gas is passed through it, A black ppt L is formed, identify all A-L elements. And write a balanced chemical equation for all the above reactions. Question 4: Fill in the blanks in the following table: Test Observation To a solution A, barium chloride solution and dil HCl is added To a solution B, sodium hydroxide solution was added To a solution C ammonium hydroxide is added in excess To a solution D silver nitrate solution with dil HNO3 is added Worksheet-G10-analyticalChemistry Jaydip_Chaudhuri Inference A contains SO42- ion Contains Fe3+ ion Contains Cu2+ ion Contains Cl- ion 1

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