QA Chemist Interview Questions and Answers for Freshers

Dispersion of pigment refers to the even distribution of pigment particles in a medium.

• Pigment dispersion is important in achieving consistent color and opacity in paints, inks, and coatings.

• Dispersion can be achieved through mechanical means such as milling or through the use of dispersing agents.

• Poor dispersion can result in uneven color, poor hiding power, and reduced durability of the final product.

Estimation of crude protein process involves determining the amount of protein in a sample using various analytical techniques.

• Crude protein estimation can be done using methods such as Kjeldahl method, Dumas method, and NIR spectroscopy.

• The process involves digesting the sample, converting nitrogen to ammonia, and then measuring the ammonia to calculate protein content.

• Accuracy of the estimation depends on proper sample preparation and calibration of instruments.

• Results are ...read more

Estimation of salt process involves determining the amount of salt present in a sample using various analytical techniques.

• Use titration method to determine the concentration of salt in a solution.

• Perform gravimetric analysis to measure the mass of salt in a sample.

• Utilize spectrophotometry to measure the absorbance of salt solutions.

• Consider using ion chromatography for accurate quantification of different ions in a salt sample.

Crude fiber estimation involves determining the indigestible portion of a sample after digestion with acid and alkali.

• Crude fiber is determined by sequentially digesting a sample with acid and alkali to remove all components except for cellulose, lignin, and other indigestible substances.

• The residue left after digestion is then dried and weighed to calculate the crude fiber content.

• Crude fiber estimation is commonly used in the analysis of animal feed and food products to ass...read more