Chemistry: Bases and Alkalis
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Questions and Answers

What is a common characteristic of a base?

  • It is a neutron acceptor
  • It is a proton acceptor (correct)
  • It is an electron donor
  • It is a proton donor

    • Which of the following is an example of a soluble base?

  • MgO
  • NaOH (correct)
  • FeO
  • Fe2O3

    • What is the reaction between NH3 and H+?

  • NH3 + H+ → NH4+ (correct)
  • NH3 + H+ → NH2+
  • NH3 + H+ → NH5+
  • NH3 + H+ → NH3H+

    • What is the formula of iron(II) hydroxide?

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

    Which of the following is NOT a metal oxide?

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

    What is the range of the pH scale?

    <p>0 to 14</p> Signup and view all the answers

    What is the pH of a neutral substance?

    <p>7</p> Signup and view all the answers

    What is the term for a substance with a pH below 7?

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

    What is the term for a substance with a pH above 7?

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

    What is the pH of a very alkaline substance?

    <p>14</p> Signup and view all the answers

    What color does Litmus turn when added to an acid?

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

    In which condition does Thymolphtalein remain colorless?

    <p>In acid</p> Signup and view all the answers

    What color does Methyl orange turn when added to an alkali?

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

    What color does Red Litmus turn when added to an alkali?

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

    What color does Thymolphtalein turn when added to an alkali?

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

    What is the role of filtering the mixture in the preparation of soluble salts?

    <p>To remove the excess of metal</p> Signup and view all the answers

    What is the product of the reaction between MgCO3(s) and HCl(aq)?

    <p>MgCl2(aq)</p> Signup and view all the answers

    What is the purpose of allowing the filtrate to evaporate?

    <p>To concentrate the solution</p> Signup and view all the answers

    What is the reactant that is used in excess in the preparation of MgCl2(aq)?

    <p>MgCO3(s)</p> Signup and view all the answers

    What is the last step in the preparation of soluble salts?

    <p>Allowing the crystals to dry</p> Signup and view all the answers

    What is the role of Ca(s) in the preparation of CaCl2(aq)?

    <p>It reacts with HCl(aq) to produce CaCl2(aq)</p> Signup and view all the answers

    What is the product of the reaction between Na₂O and 2HCl?

    <p>NaCl + H₂O</p> Signup and view all the answers

    What is the reaction between 2KOH and H₂SO₄?

    <p>K₂SO₄ + 2H₂O</p> Signup and view all the answers

    What is the product of the reaction between Ca(OH)₂ and 2HNO₃?

    <p>Ca(NO₃)₂ + H₂O</p> Signup and view all the answers

    What is the reaction between MgO and 2HCl?

    <p>MgCl₂ + H₂O</p> Signup and view all the answers

    What is the product of the reaction between KOH and NH₄Cl?

    <p>KCl + NH₃ + H₂O</p> Signup and view all the answers

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