IGNOU MCH 25 SOLVED ASSIGNMENT

Ques 1.

oxidation and oxidizing agent

Ques 2.

reduction and reducing agent

Ques 3.

 a galvanic cell and an electrolytic cell

Ques 4.

voltammetry and polarography

Ques 5.

Consider the following electrochemical cell 

Ques 6.

 Consider the following electrochemical cell 
$

Ques 7.

Calculate the EMF of the cell. Where,
 and 

Ques 8.

What is Coulometer? Explain briefly. Write cathodic and anodic reaction of hydrogen-nitrogen coulometer, where 0.1 M hydrazine sulphate is used as the electrolyte. 

Ques 9.

 In a coulometric method, 200 mg of nitrobenzene in  of methanol is reduced to phenyl hydroxylamine at a constant potential of -0.95 V (vs. SCE) applied to an Hg electrode. Following reaction takes 30 minutes to complete.
$
Calculate the percentage of nitrobenzene if above reduction requires 32mA current. 

Ques 10.

What is dropping mercury electrode? Give its advantages. 

Ques 11.

 Indium and Cadmium ions in 0.1 M HCl give peaks at potentials -0.557 V and -0.597 V by differential pulse polarographic analysis. When a standard solution containing 0.4 ppm of indium is analysed, it gave peak current (in arbitrary units) corresponding to 100.25 at -0.557 V and 43.75 at -0.597 V. A standard solution containing 0.4 ppm of Cd gave i_p 29.52 at -0.557 V and 64.8 at -0.597 V. What is the concentration of indium and cadmium in a sample if the peak current is 190 at -0.557 V and 120 at -0.597 V. 

Ques 12.

What are amperometric titrations? Draw common types of curves obtained in amperometric titrations. What will be the shape of the curve in bioamperometry for the titration of iodine by thiosulphate? 

Ques 13.

 What is common source of errors in thermogravimetric analysis (TGA)? A mixture of CaO and  is analysed by TGA. The result indicates that mass of the sample decreases from  to  only between  and . Calculate the percentage of calcium carbonate in the mixture. 

Ques 14.

 Explain how thermometric titrations are different than classical titrations. Discuss their advantages. 
(b) What is the principle of differential scanning calorimetry (DSC)? Draw the schematic diagram of a DSC instrument. 

Ques 15.

Ques 16.

Ques 17.

Ques 18.

Ques 19.

What are the common sources of neutron for neutron activation analysis (NAA)? What factors contribute to higher sensitivity in NAA? Briefly explain any one. 

Ques 20.

Explain why neutron induced reactions are most common whereas deuteron induced reactions require accelerator facility to carry out these reactions. 

Ques 21.

 In an isotope dilution analysis experiment,  radiolabelled analyte with specific activity  was added. After equilibration and chemical separation  pure analyte having specific activity  was isolated. Calculate the amount of analyte in the sample. 

Ques 22.

What is the difference between SEM and TEM? Write the advantages of TEM over SEM? 

Ques 23.

Which components are used in the X-ray photoelectron spectroscopy (XPS) instrument? Briefly explain with a schematic diagram of XPS Instrumentation. 

Ques 24.

What information does the energy dispersive spectroscopy (EDS) provide? Write any three applications of EDS. 
 

Ques 25.

Briefly explain the basic principle of Auger Electron Spectroscopy (AES) with a suitable diagram. 

Ques 26.

 Write the basic principle of Rutherford backscattering spectroscopy (RBS) also name the ions commonly used for primary beam in RBS. 

Ques 27.

How does atomic force microscopy (AFM) work? Explain briefly with their applications. 

Ques 28.

oxidation and oxidizing agent

Ques 29.

reduction and reducing agent

Ques 30.

 a galvanic cell and an electrolytic cell

Ques 31.

voltammetry and polarography

Ques 32.

Consider the following electrochemical cell 

Ques 33.

 Consider the following electrochemical cell 
$

Ques 34.

Calculate the EMF of the cell. Where,
 and 

Ques 35.

What is Coulometer? Explain briefly. Write cathodic and anodic reaction of hydrogen-nitrogen coulometer, where 0.1 M hydrazine sulphate is used as the electrolyte. 

Ques 36.

 In a coulometric method, 200 mg of nitrobenzene in  of methanol is reduced to phenyl hydroxylamine at a constant potential of -0.95 V (vs. SCE) applied to an Hg electrode. Following reaction takes 30 minutes to complete.
$
Calculate the percentage of nitrobenzene if above reduction requires 32mA current. 

Ques 37.

What is dropping mercury electrode? Give its advantages. 

Ques 38.

 Indium and Cadmium ions in 0.1 M HCl give peaks at potentials -0.557 V and -0.597 V by differential pulse polarographic analysis. When a standard solution containing 0.4 ppm of indium is analysed, it gave peak current (in arbitrary units) corresponding to 100.25 at -0.557 V and 43.75 at -0.597 V. A standard solution containing 0.4 ppm of Cd gave i_p 29.52 at -0.557 V and 64.8 at -0.597 V. What is the concentration of indium and cadmium in a sample if the peak current is 190 at -0.557 V and 120 at -0.597 V. 

Ques 39.

What are amperometric titrations? Draw common types of curves obtained in amperometric titrations. What will be the shape of the curve in bioamperometry for the titration of iodine by thiosulphate? 

Ques 40.

 What is common source of errors in thermogravimetric analysis (TGA)? A mixture of CaO and  is analysed by TGA. The result indicates that mass of the sample decreases from  to  only between  and . Calculate the percentage of calcium carbonate in the mixture. 

Ques 41.

 Explain how thermometric titrations are different than classical titrations. Discuss their advantages. 
(b) What is the principle of differential scanning calorimetry (DSC)? Draw the schematic diagram of a DSC instrument. 

Ques 42.

Ques 43.

Ques 44.

Ques 45.

Ques 46.

What are the common sources of neutron for neutron activation analysis (NAA)? What factors contribute to higher sensitivity in NAA? Briefly explain any one. 

Ques 47.

Explain why neutron induced reactions are most common whereas deuteron induced reactions require accelerator facility to carry out these reactions. 

Ques 48.

 In an isotope dilution analysis experiment,  radiolabelled analyte with specific activity  was added. After equilibration and chemical separation  pure analyte having specific activity  was isolated. Calculate the amount of analyte in the sample. 

Ques 49.

What is the difference between SEM and TEM? Write the advantages of TEM over SEM? 

Ques 50.

Which components are used in the X-ray photoelectron spectroscopy (XPS) instrument? Briefly explain with a schematic diagram of XPS Instrumentation. 

Ques 51.

What information does the energy dispersive spectroscopy (EDS) provide? Write any three applications of EDS. 
 

Ques 52.

Briefly explain the basic principle of Auger Electron Spectroscopy (AES) with a suitable diagram. 

Ques 53.

 Write the basic principle of Rutherford backscattering spectroscopy (RBS) also name the ions commonly used for primary beam in RBS. 

Ques 54.

How does atomic force microscopy (AFM) work? Explain briefly with their applications. 

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