Identification of Salts

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PAKTURK INTERNATIONAL SCHOOL & COLLEGES ISLAMABAD SUBJECT: CHEMISTRY MARKS: 25 CLASS: 10-O Level TIME: 40 Min. ATTEMPT ALL THE QUESTIONS ON YOUR ANSWERSHEETS WITH NEAT PRESENTATION. Q.No.1: Choose the most suitable answer. 1. An excess of dilute sulphuric acid reacts with both aqueous barium hydroxide and aqueous barium chloride. In what way the two reactions are same? A. a gas is produced. B. an insoluble salt is produced. C. The final pH is 7. D. Water is produced. 2. Which salt could be prepared by a method involving crystallization as a final stage? A. barium sulphate B. calcium carbonate C. silver chloride D. sodium nitrate 3. An element X forms a hydroxide, which dissolves, both in acids and in alkalis. What could X be? A. aluminium B. calcium C. copper D. iron 4. In which reaction is dilute sulphuric acid not behaving as an acid? A. H2SO4 + 2NaOH ((((( Na2SO4 + 2H2O B. H2SO4 + BaCl2 ((((( BaSO4 + 2HCl C. H2SO4 + CuO ((((( CuSO4 + H2O D. H2SO4 + Mg ((((( MgSO4 + H2 5. Which words in the table complete the following description of the preparation of copper (II) sulphate? An excess copper (II) oxide was added to dilute sulphuric acid. Th mixture was __1___ to remove the excess of oxide. The solution was __2___ to half its volume and then cooled, so that it __3___. | |1 |2 |3 | |A |distilled |evaporated |crystallized | |B |distilled |filtered

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