Chemical Analysis
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Questions and Answers

What is the role of iodine in iodimetric titrations?

  • Complexing agent
  • Precipitating agent
  • Reducing agent
  • Oxidising agent (correct)

    • In which type of medium is potassium permanganate commonly used?

  • Basic medium
  • Alkaline medium
  • Neutral medium
  • Acidic medium (correct)

    • What is the difference between iodimetric and complexometric titrations?

  • Iodimetric titrations involve precipitation, while complexometric titrations involve complex formation. (correct)
  • Iodimetric titrations involve reduction, while complexometric titrations involve oxidation.
  • Iodimetric titrations involve oxidation, while complexometric titrations involve reduction.
  • Iodimetric titrations involve complex formation, while complexometric titrations involve precipitation.

    • What is the role of EDTA in complexometric titrations?

    <p>As a complexing agent</p> Signup and view all the answers

    What is the advantage of complexometric titrations over precipitation titrations?

    <p>There is no error due to co-precipitation</p> Signup and view all the answers

    Which type of titrations involves the formation of insoluble precipitates?

    <p>Precipitation titrations</p> Signup and view all the answers

    What is the purpose of maintaining an acidic medium in dichromate titrations?

    <p>To facilitate the reaction between potassium dichromate and the analyte</p> Signup and view all the answers

    What is the primary use of potassium permanganate in titrations?

    <p>Estimation of ferrous salts and oxalic acid</p> Signup and view all the answers

    What is the characteristic of the solution of potassium dichromate?

    <p>It can be directly used for titrations</p> Signup and view all the answers

    What occurs in iodimetric and iodometric titrations?

    <p>Both oxidation of iodide ions to free iodine and reduction of free iodine to iodide ions</p> Signup and view all the answers

    What is the role of potassium ferricyanide in dichromate titrations?

    <p>It acts as an external indicator</p> Signup and view all the answers

    What is the advantage of using potassium permanganate in titrations?

    <p>It is a self-indicator and produces a distinct colour change</p> Signup and view all the answers

    What is the purpose of using potassium iodide in iodometric titrations?

    <p>To liberate free iodine from an oxidising agent</p> Signup and view all the answers

    In which type of medium is the reaction between potassium iodide and an oxidising agent usually carried out?

    <p>Neutral medium</p> Signup and view all the answers

    What is the purpose of titrating free iodine with sodium thiosulphate in iodometric titrations?

    <p>To estimate the concentration of the oxidising agent</p> Signup and view all the answers

    Which of the following can be estimated using potassium permanganate as an oxidising agent?

    <p>Sulphite and thiosulphate</p> Signup and view all the answers

    What is the role of phenolphthalein in titrations?

    <p>To act as an indicator in titrations of strong alkalies</p> Signup and view all the answers

    What type of titrations involve the use of an oxidising agent to react with potassium iodide?

    <p>Iodometric titrations</p> Signup and view all the answers

    What is the equivalent mass of H2SO4 in the reaction 2 NaCl + H2SO4 → Na2SO4 + 2 HCl?

    <p>49.0</p> Signup and view all the answers

    What is the molarity of a solution containing 60 g of NaOH in 1 liter of solution?

    <p>1 M</p> Signup and view all the answers

    What is the number of milli-equivalents of 0.5 g of H2C2O4.2H2O?

    <p>7.94</p> Signup and view all the answers

    What is the strength of a solution containing 40 g of NaOH in 1 liter of solution?

    <p>40 g/L</p> Signup and view all the answers

    What is the equivalent mass of CH3COOH?

    <p>60.0</p> Signup and view all the answers

    What is the number of moles of 0.126 g of H2C2O4.2H2O?

    <p>0.001</p> Signup and view all the answers

    What is the equivalent mass of a substance if its molecular mass is 100 and it is 2 electron change?

    <p>50</p> Signup and view all the answers

    What is the number of moles of NH3 produced when 1 mole of NH4Cl reacts with NaOH?

    <p>1</p> Signup and view all the answers

    What is the molarity of a solution of CoCl2 if 1 litre of the solution contains 0.2 moles of CoCl2?

    <p>0.2 M</p> Signup and view all the answers

    What is the strength of a solution of HCl if 10 ml of the solution reacts with 20 ml of 1M NaOH?

    <p>1 M</p> Signup and view all the answers

    What is the equivalent mass of an acid if it donates 1 electron and its molecular mass is 80?

    <p>40</p> Signup and view all the answers

    What is the number of milli-equivalents of NaOH required to react with 1 mole of NH4Cl?

    <p>5000</p> Signup and view all the answers

    What is the equivalent mass of NaOH?

    <p>40 g</p> Signup and view all the answers

    If the molecular mass of KMnO₄ is 158 g/mol, what is its equivalent mass in acidic medium?

    <p>31.6 g</p> Signup and view all the answers

    What is the molarity of a solution of NaOH if 2.5 L of the solution contains 100 g of NaOH?

    <p>1.25 M</p> Signup and view all the answers

    What is the normality of a solution of H₂SO₄ if 1 L of the solution contains 49 g of H₂SO₄?

    <p>2 N</p> Signup and view all the answers

    What is the strength of a solution of NaOH if 1 L of the solution contains 40 g of NaOH?

    <p>400 g/L</p> Signup and view all the answers

    If 25 mL of a NaOH solution reacts completely with 30 mL of a H₂SO₄ solution, what is the normality of the NaOH solution?

    <p>1 N</p> Signup and view all the answers

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