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

Which of the following is NOT a metal oxide?

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

What is the range of the pH scale?

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

What is the pH of a neutral substance?

<p>7 (B)</p> Signup and view all the answers

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

<p>Acid (A)</p> Signup and view all the answers

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

<p>Alkali (B)</p> Signup and view all the answers

What is the pH of a very alkaline substance?

<p>14 (B)</p> Signup and view all the answers

What color does Litmus turn when added to an acid?

<p>Red (A)</p> Signup and view all the answers

In which condition does Thymolphtalein remain colorless?

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

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

<p>Yellow (B)</p> Signup and view all the answers

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

<p>Blue (D)</p> Signup and view all the answers

What color does Thymolphtalein turn when added to an alkali?

<p>Blue (C)</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 (C)</p> Signup and view all the answers

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

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

What is the purpose of allowing the filtrate to evaporate?

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

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

<p>Allowing the crystals to dry (A)</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) (B)</p> Signup and view all the answers

What is the product of the reaction between Naâ‚‚O and 2HCl?

<p>NaCl + Hâ‚‚O (A)</p> Signup and view all the answers

What is the reaction between 2KOH and Hâ‚‚SOâ‚„?

<p>Kâ‚‚SOâ‚„ + 2Hâ‚‚O (C)</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 (C)</p> Signup and view all the answers

What is the reaction between MgO and 2HCl?

<p>MgClâ‚‚ + Hâ‚‚O (B)</p> Signup and view all the answers

What is the product of the reaction between KOH and NHâ‚„Cl?

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

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