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Sch 404: Instrumental Methods Question Paper

Sch 404: Instrumental Methods

Course:Bachelor Of Science

Institution: Kenyatta University question papers

Exam Year:2009

INSTRUCTIONS:
Answer ALL Questions
Q1. a) Atomization is an important procedure in atomic spectroscopic analysis.
i) Using a diagram explain the process of nebulization.
ii) Describe two non-frame procedure of atomization, mentioning
their advantages and disadvantages [10marks]
b) Quantitative analysis using UV-Visible spectrophotometer is based on the
law of photometry.
i) State the law and describe the causes of non-linearity at high
sample concentration.
ii) Explain giving essential experimental details only, UV-Visible
procedure for the analysis of phosphorous in local water supply.
[12marks]
Q2. a) i) Explain the process of activation analysis in radio-chemical analysis
ii) 10 mg of a labeled analyte, with specific activity of 18870cpm was
added to the mixture analyzed. After thoroughly mixing 1.5mg
of the pure analyte was separated and its specific activity was
found to be 1550cpm. What was the amount of the analyte in the
original sample? [7marks]
Page 2 of 2
b) i) Explain what causes the absorption of radiation by a molecule in
the mid-infrared (IR) region of the electromagnetic spectrum.
ii) Describe the nature of the IR spectrum obtained for CO2
[7marks]
c) Name four types of ion selective electrodes used potentiometery and
explain how the concentration a gas can be determined in this technique.
Q3. a) Write brief notes on the following terms
i) Electron impact ionization in MS
ii) Photocathode detector
iii) Limiting and diffusion current in polarography [9marks]
b) What caused chemical shift and spin-spin splitting in NMR
[4marks]
c) Explain the difference between differential thermal analysis (DTA) and
differential scanning calorimetry. Draw a labeled DTA thermogram for
calcium acetate monohydrate when heated to 1000C.

Sch 404: Instrumental Methods Question Paper

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