Formation of a Precipitate in Chemical Reactions
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Questions and Answers

What is the characteristic feature of the chemical reaction between sulphuric acid and barium chloride solution?

  • Formation of a white precipitate of barium sulphate (correct)
  • Increase in temperature of the reaction
  • Change in color of the solution
  • Emission of hydrogen gas

    • When colourless solutions of lead nitrate and potassium iodide are mixed, what is formed?

  • A gas is produced
  • A yellow precipitate of lead iodide (correct)
  • A white precipitate of lead iodide
  • The color of the solution changes

    • What happens to the color of the potassium permanganate solution when it reacts with citric acid?

  • The color changes from purple to yellow
  • The color does not change
  • The color changes from purple to green
  • The color changes from purple to colourless (correct)

    • Which of the following is NOT a characteristic feature of a chemical reaction?

    <p>Increase in temperature of the reaction</p> Signup and view all the answers

    What type of gas is produced in a chemical reaction?

    <p>Hydrogen gas</p> Signup and view all the answers

    Which of the following is a characteristic feature of precipitation in a chemical reaction?

    <p>Formation of an insoluble product</p> Signup and view all the answers

    Which gas is produced when zinc granules react with dilute sulphuric acid?

    <p>Hydrogen gas</p> Signup and view all the answers

    What happens to the temperature during the reaction of zinc granules with dilute sulphuric acid?

    <p>The temperature increases</p> Signup and view all the answers

    Which of the following gases is evolved when magnesium reacts with dilute hydrochloric acid or dilute sulphuric acid?

    <p>Hydrogen gas</p> Signup and view all the answers

    What gas is produced when dilute hydrochloric acid is poured over sodium carbonate?

    <p>Carbon dioxide gas</p> Signup and view all the answers

    Which of the following statements is true about the term 'precipitate'?

    <p>It is a solid formed during a chemical reaction that separates from the solution</p> Signup and view all the answers

    In the reaction between zinc granules and dilute sulphuric acid, what is the purpose of using dilute acid instead of concentrated acid?

    <p>To control the rate of the reaction and prevent it from becoming too violent</p> Signup and view all the answers

    Which of the following statements accurately describes the formation of a precipitate?

    <p>A precipitate is formed when two aqueous solutions react, and one of the products is insoluble in water.</p> Signup and view all the answers

    Which of the following reactions involves the formation of a precipitate?

    <p>Reaction between potassium iodide and lead nitrate, producing a yellow precipitate of lead iodide.</p> Signup and view all the answers

    What is the purpose of passing a gas into an aqueous solution during a chemical reaction?

    <p>To form a precipitate when the product is insoluble in the aqueous solution.</p> Signup and view all the answers

    Which of the following reactions involves the formation of hydrogen gas?

    <p>Reaction between magnesium and a dilute acid, producing hydrogen gas.</p> Signup and view all the answers

    Which gas is commonly used to form a precipitate when passed into an aqueous solution?

    <p>Carbon dioxide gas</p> Signup and view all the answers

    What is the observable change that occurs when a precipitate is formed during a chemical reaction?

    <p>A change in the color of the reaction mixture due to the formation of a solid precipitate.</p> Signup and view all the answers

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