IGNOU MCH 1 SOLVED ASSIGNMENT 2026

Ques 1.

What are optical methods of analysis? List different optical methods of analysis and explain the principle of fluorophotometry. 

Ques 2.

Discuss different means of minimizing errors and improving the accuracy of an analytical determination. 

Ques 3.

The precision of a population of data is indicated in terms of standard deviation. Explain the meaning of standard deviation and illustrate the same with the help of an example. 

Ques 4.

What is meant by confidence level of an analytical data? The measurements of glucose levels in a patient suffering from diabetes gave the following results: 1.108, 1.100, 1.122, 1.088, 1.115, 1.099 and 1.075 g/L. Calculate the 95% confidence interval for the set; you may assume the value of Cn to be = 0.4 

Ques 5.

What is meant by confidence level of an analytical data? The measurements of glucose levels in a patient suffering from diabetes gave the following results: 1.108, 1.100, 1.122, 1.088, 1.115, 1.099 and 1.075 g/L. Calculate the 95% confidence interval for the set; you may assume the value of Cn to be = 0.4 

Ques 6.

What is meant by confidence level of an analytical data? The measurements of glucose levels in a patient suffering from diabetes gave the following results: 1.108, 1.100, 1.122, 1.088, 1.115, 1.099 and 1.075 g/L. Calculate the 95% confidence interval for the set; you may assume the value of Cn to be = 0.4 

Ques 7.

What is meant by confidence level of an analytical data? The measurements of glucose levels in a patient suffering from diabetes gave the following results: 1.108, 1.100, 1.122, 1.088, 1.115, 1.099 and 1.075 g/L. Calculate the 95% confidence interval for the set; you may assume the value of Cn to be = 0.4 

Ques 8.

Why do we need to reject some data? Explain the ‘4d’ rule for the rejection of a data. 

Ques 9.

What is meant by a ‘sample’ for analytical determination? Discuss the sampling of food materials. 

Ques 10.

 Why is it essential to consider the safety aspect at the time of the construction of the laboratory building? List any three requirements that must be met as per the norms in a chemical laboratory. 

Ques 11.

 What is meant by incompatibility of chemicals? List different methods of storage of chemicals and state the recommendations for the safe storage of chemicals in a laboratory. 

Ques 12.

A reactant A gives a product P in a first order irreversible reaction. Derive an integrated rate equation for the reaction. Calculate the time required for 90 % conversion of A to P if the time for 50% conversion is 30 s. 

Ques 13.

What is meant by the leveling effect of a solvent? Explain with the help of a suitable example. 

Ques 14.

Which is more basic; 0.10 M NaOCl or 0.001M KOH. Justify your answer with calculations. 

Ques 15.

What is meant by buffer capacity? Calculate the buffer capacity of a solution, which is 0.10 M in formic acid and 0.10 M in sodium formate. (pKa of acetic acid = 3.74). 

Ques 16.

What are indicators? Discuss the Ostwald’s theory of acid base indicators and derive an expression relating the pH and the concentration of two forms of the indicator. 

Ques 17.

Discuss the role of non-aqueous solvents in acid base titrations. 

Ques 18.

Calculate the equilibrium constant of the following reaction and predict the direction of the reaction. 

Ni (s) + 2Ag+ (aq.) ⇌ Ni²+ (aq.) + Ag(s)

Given: E°_Ni²⁺/Ni = -0.25 and E°_Ag⁺/Ag = 0.80

Ques 19.

What are oxidimetric reagents? Illustrate the use of potassium bromate as an oxidimetric reagent with the help of a suitable example. 

Ques 20.

 Differentiate between stepwise formation constants and overall formation constants for the formation of a complex with the help of an example. 

Ques 21.

What is Mohr titration? Explain the principle of Mohr’s titration explaining the equilibria involved in end point determination. 

Ques 22.

Organic reagents play an important role in gravimetric analysis. Describe the different types of reactions involved in such determinations. 

Ques 23.

Give a brief account of the role of computers in analytical instrumentation. 

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