Chemical Reactions: Class IX Chapter 3 and 4
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Questions and Answers

What type of reaction takes place when calcium hydroxide (Ca(OH)2) reacts with carbon dioxide (CO2) to form calcium carbonate (CaCO3) and water (H2O)?

  • Combustion reaction
  • Decomposition reaction
  • Displacement reaction
  • Combination reaction (correct)
  • In the reaction where carbon (C) burns in the presence of oxygen (O2) to form carbon dioxide (CO2), what type of reaction is this?

  • Combustion reaction (correct)
  • Combination reaction
  • Displacement reaction
  • Decomposition reaction
  • What type of reaction takes place when hydrogen (H2) and oxygen (O2) combine to form water (H2O)?

  • Combustion reaction
  • Displacement reaction
  • Decomposition reaction
  • Combination reaction (correct)
  • What is the formula for the balanced chemical equation when methane (CH4) burns in the presence of oxygen (O2) to form carbon dioxide (CO2) and water (H2O)?

    <p>CH4 + 2O2 → CO2 + 2H2O</p> Signup and view all the answers

    Which of the following chemical reactions is an example of an exothermic reaction?

    <p>All of the above</p> Signup and view all the answers

    What is the balanced chemical equation for the reaction where glucose (C6H12O6) reacts with oxygen (O2) to produce carbon dioxide (CO2), water (H2O), and energy?

    <p>C6H12O6 + 6O2 → 6CO2 + 6H2O + energy</p> Signup and view all the answers

    What type of reaction is represented by the equation: CaO(s) + H2O(l) → Ca(OH)2(aq) + Heat?

    <p>Combination reaction</p> Signup and view all the answers

    Which of the following statements is true about the reaction between calcium oxide and water?

    <p>It is an exothermic reaction</p> Signup and view all the answers

    What is the chemical formula of slaked lime?

    <p>Ca(OH)2</p> Signup and view all the answers

    Which of the following reactions occurs when slaked lime is exposed to air over time?

    <p>Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)</p> Signup and view all the answers

    What is the chemical formula for marble?

    <p>CaCO3</p> Signup and view all the answers

    What is the purpose of whitewashing walls with slaked lime?

    <p>To provide a shiny finish</p> Signup and view all the answers

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