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

Which type of titrations involves the formation of insoluble precipitates?

<p>Precipitation titrations (D)</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 (B)</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 (C)</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 (C)</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 (D)</p> Signup and view all the answers

What is the role of potassium ferricyanide in dichromate titrations?

<p>It acts as an external indicator (C)</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 (C)</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 (C)</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 (B)</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 (C)</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 (C)</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 (C)</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 (D)</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 (D)</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 (A)</p> Signup and view all the answers

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

<p>7.94 (A)</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 (A)</p> Signup and view all the answers

What is the equivalent mass of CH3COOH?

<p>60.0 (D)</p> Signup and view all the answers

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

<p>0.001 (B)</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 (C)</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 (B)</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 (B)</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 (D)</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 (B)</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 (C)</p> Signup and view all the answers

What is the equivalent mass of NaOH?

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

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

<p>31.6 g (D)</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 (B)</p> Signup and view all the answers

What is the normality of a solution of Hâ‚‚SOâ‚„ if 1 L of the solution contains 49 g of Hâ‚‚SOâ‚„?

<p>2 N (B)</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 (C)</p> Signup and view all the answers

If 25 mL of a NaOH solution reacts completely with 30 mL of a Hâ‚‚SOâ‚„ solution, what is the normality of the NaOH solution?

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

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