IGNOU MCH 4 SOLVED ASSIGNMENT 2026 2027

Ques 1.

What do you understand by cell potential? Calculate the potential of following electrodes:

i) A copper electrode immersed in 0.022 M Cu (NO3)2

ii) A zinc electrode immersed in 0.030 M Zn (NO3)2

Ques 2.

 Describe various factors that cause errors in pH measurement.

Ques 3.

What is solid state membrane electrode? Draw a sketch and describe their applications.

Ques 4.

 Define conductivity, cell constant and molar conductivity. Resistance of a conductivity cell filled with 0.1M KCl solution is 100 Ω. If the resistance of the same cell when filled with 0.02 M KCl solution is 520 Ω, calculate the conductivity and molar conductivity of 0.02 M KCl solution. The conductivity of 0.1 M KCl solution is 1.29 Sm¹.

Ques 5.

How will you analyse a binary alloy of copper and silver thermogravimetrically.

Ques 6.

 A solution of CuSO4 is electrolysed for 10 minutes with a current of 1.5 amperes. What is the mass of copper deposited at the cathode?

Ques 7.

 Explain how will you determine dissociation constant of a weak acid or base by conductometric method.

Ques 8.

The conductivity of 0.001028 M acetic acid is 4.95 × 105 S cm²¹. Calculate its dissociation constant if the limited molar conductivity for acetic acid is 390.5Scm² mol¹.

Ques 9.

Describe the design and principle of constant current coulometry. Write three main applications of coulometric titrations.

Ques 10.

 Enlist various voltammetric methods of analysis. Write briefly about anodic stripping voltammetry(ASV) and its usefulness for trace elemental analysis.

Ques 11.

 Explain the terms limiting current, migration current, diffusion current, residual current and half wave potential.

Ques 12.

What is dropping mercury electrode? Give its advantages.

Ques 13.

What are amperometric titrations? Draw common types of curves obtained in amperometric titrations. Briefly discuss their experimental set up.

Ques 14.

List the factors affecting TG curve. Taking a suitable example, explain the effect of furnace atmosphere on TG curve.

Ques 15.

Draw a labelled diagram of the TG curve obtained by heating a mixture of 50 mg of calcium oxalate monohydrate and 50 mg of barium oxalate monohydrate to 1200°C. Calculate the amount of all mass losses.

Ques 16.

Explain the basic principle of Differential Scanning Calorimetry (DSC). Draw a block diagram of DSC instrument.

Ques 17.

Describe various types of neutron sources available for NAA. Which one of these is most suitable for trace element analysis?

Ques 18.

In what respects nuclear reactions are different from chemical reactions? Calculate Q value of the reaction 63Cu = (η, γ) 64 Cu. Give that Cu = 62.929590, Cu = 64, 63.929760, n =1.008665 amu.

Ques 19.

 Explain why (n, y) reaction is most suited for NAA.

Ques 20.

 Discuss the principle of isotope dilution technique

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