Inorganic Analytical Chemistry

Set No.1

Code No: RR10801

I B.Tech. Regular Examinations, June -2005 INORGANIC & ANALYTICAL CHEMISTRY (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Discuss the underlying principle in complexometric titration taking the example of determination of Ca2+ with EDTA. (b) What is the pH of a solution that is 0.04 M in formic acid &0.01M in sodium formate? (Ka of formic acid is 1.74 × 10−4 ) 2. (a) Define polarographic maxima.How is it eliminated in polarographic technique? (b) Describe the potentiometric titration of ferrous ammonium sulphate versus potassium dichromate. 3. (a) Explain froath floatation process with neat sketch. (b) Write short note on: i. Levigation ii. Electro magnetic separation. 4. (a) Explain briefly the ultimate analysis of fuel. (b) Bring out the difference and utility of proximate and ultimate analysis of coal. 5. (a) What are anti-knocking compounds? How can octane rating be improved . (b) A Sample of coal was found to contain the following C: 81%; H: 4%; O=2%; N=10%; the remaining being ash. Estimate the quantity of minimum air remaining for complete combustion of 1Kg of the sample. Find the composition of dry flue gas by volume, if 40% excess air is supplied. 6. (a) Name the different units of hardness and explain their interconversion. (b) Describe the disadvantages of hard water when used for steam generation in boilers. 7. Describe the various electric insulators and their uses. 8. An exhausted Zeolite softner was regenerated by passing 150 lit of NaCl solution, having strength of 150 g/L of NaCl. If the hardness of water is 800 ppm, calculate the total volume of water that is softned by this softner. ?????

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Set No.2

Code No: RR10801

I B.Tech. Regular Examinations, June -2005 INORGANIC & ANALYTICAL CHEMISTRY (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) State Beer Lambert’s law and explain the terms transmittance, absorbance and molarextinction co efficient .How are they related to each other? (b) What is Cupferron? Discuss its use as an organic precipitant with suitable examples. 2. (a) What are electroanalytical methods ?Explain different electro analytical methods with suitable examples. (b) Give the value of diffusion current if c=1mole/litre D=3.2 µ a,m=1.41mg/sec,t=1.85 sec (n=1). 3. (a) Give different chemical reactions for different types of roasting. (b) Explain calcination and smelting. 4. (a) Explain briefly the ultimate analysis of fuel. (b) Bring out the difference and utility of proximate and ultimate analysis of coal. 5. (a) Discuss the industrial uses of gaseous fuels. (b) A sample of coal was found to containing the following; C=81%, H2=4.0%, O=2.0%, N=1.0%; the remaining being ash. Estimate the quantity of maximum air required for the complete combustion of 1Kg of the sample; if 40% of the excess air supplied. 6. Compare the lime-soda, zeolite and ion-exchange processes used for softening water. 7. (a) Enumerate the various properties of a refractory. (b) Write a note on the applications of solid thermal insulators. 8. Calculate the total hardness in o Fr and o Clarke for a sample of water that showed the following analysis:KOH = 0.0056 gm/litre; Ca(HCO3 )2 = 0.0162 gm/litre; NaCl = 0.585 gm/litre; MgSO4 = 0.024 gm/litre; MgCl2 = 0.019 gm/litre; Ca(NO3 )2 = 0.0164 gm/litre. Assume that the masses of Mg, Ca, K and Na atoms are respectively 24, 40, 39 and 23. ????? 1 of 1

Set No.3

Code No: RR10801

I B.Tech. Regular Examinations, June -2005 INORGANIC & ANALYTICAL CHEMISTRY (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) State Beer Lambert’s law and explain the terms transmittance, absorbance and molarextinction co efficient .How are they related to each other? (b) What is Cupferron? Discuss its use as an organic precipitant with suitable examples. 2. (a) What are potentiometric titrations?Give atleast 2 important applications of potentiometric titrations. (b) What was the concentration of Cd solution if in polarographic analysis, the diffusion coefficient was 0.72 × 10−5 cm2 /sec,with rate of flow is 2mg/sec with drop time 4.4 sec and magnitude of average diffusion current was 10µ A ? 3. (a) Explain Bessemer converter process for manufacture of steel with diagram. (b) How is steel classified? Give one example of each. 4. (a) How do you classify coals by rank? (b) Write a note on significance of ultimate analysis of coal. 5. (a) What is Boy’s Calorimeter. (b) Describe its construction and working. (c) What are the calculations involved in it. 6. (a) What are ion-exchange resins? Explain their types. (b) Describe the ion-exchange process for the softening of water used in boilers. 7. (a) What is Segercone test and what is its importance? (b) How do you distinguish between dielectric and an insulator? 8. Determine the temporary, permanent and total hardness in PPM units for water which showed the following analysis:NaCl = 5.85 mg/litre; KCl = 7.45 mg/litre; CaCl2 = 11.1 mg/litre; Mg(HCO3 )2 = 14.6 mg/litre; MgSO4 = 12 mg/litre; Ca(HCO3 )2 = 16.2 mg/litre. Assume that the atomic weights of Na, Mg, K and Ca are 23, 24, 39 and 40 respectively. ?????

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Set No.4

Code No: RR10801

I B.Tech. Regular Examinations, June -2005 INORGANIC & ANALYTICAL CHEMISTRY (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Discuss briefly the use of internal oxidation -reduction indicators in redox titrations. (b) What should be the magnitude of molar absorbivity if 1.25 × 10−5 M solution had an absorbance of 0.210 with optical path of 10mm at 430 nm ? 2. (a) What are electroanalytical methods ?Explain different electro analytical methods with suitable examples. (b) Give the value of diffusion current if c=1mole/litre D=3.2 µ a,m=1.41mg/sec,t=1.85 sec (n=1). 3. (a) Explain Bessemer converter process for manufacture of steel with diagram. (b) How is steel classified? Give one example of each. 4. (a) What are the various factors which affect the calorific value of a fuel? (b) Discuss the process of coal carbonization. (c) Why should an ideal fuel have moderate ignition temperature? 5. (a) Explain the difference between straight-run gasoline and synthetic petrol (b) Describe the manufacture of synthetic petrol by polymerization process. (c) When 0.935g of a fuel underwent complete combustion in excess of oxygen, the increase of temperature of water in the bomb calorimeter containing 1365g of water was 2.40 C. Calculate the higher calorific value of the fuel, if the water equivalent of the calorimeter etc. is 135gms. 6. (a) Explain the difference between carbonate and non-carbonate hardness of water. (b) State the harmful effects of silica present in water. (c) Write a note on sterilization of drinking water. 7. (a) Write any four important properties of refractories. (b) Explain the effect of texture of refractory on the refractoriness. (c) Describe briefly the effect of pores on thermal insulation. 8. Determine the amounts of lime and soda needed in kilos for softening 10,000 litres of water using 82 PPM of NaAlO2 as coagulant. The analysis of water was as follows:1 of 2

Set No.4

Code No: RR10801

KCl = 74.5 PPM; NaCl = 58.5 PPM; Mg(HCO3 )2 = 146 PPM; CaCl2 = 111PPM; Dissolved CO2 = 44 PPM. Given that the wt. of Na, Mg, K, Ca and Al are 23, 24, 39, 40 and 27 amu respectively. ?????

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