Chemical Analyst Interview Questions and Answers

Drinking water should meet certain standards to ensure it is safe for consumption.

• Drinking water should be free from harmful contaminants such as bacteria, viruses, and chemicals

• The pH level of drinking water should be between 6.5 and 8.5

• Drinking water should contain adequate levels of minerals such as calcium and magnesium

• The maximum allowable level of lead in drinking water is 0.015 mg/L

• The World Health Organization has established guidelines for drinking water quality

Friability testing is a method to determine the durability of tablets or granules by measuring the amount of abrasion or fragmentation.

• It involves subjecting the tablets or granules to mechanical stress by tumbling them in a rotating drum.

• The weight loss or percentage of broken pieces is measured to determine the friability of the sample.

• It is an important quality control test for pharmaceutical products.

• The USP sets standards for friability testing, with a maximum weight los...read more

Calibration of Blaine apparatus is essential for accurate measurement of fineness of cement particles.

• Calibration involves checking the accuracy of the Blaine apparatus by using a standard reference material.

• Adjusting the pressure and flow rate of air through the apparatus to ensure consistent results.

• Regular calibration helps in maintaining the reliability and accuracy of the Blaine apparatus.

• Examples of standard reference materials used for calibration include certified cem...read more

P2O5 is a chemical compound commonly used as a desiccant and dehydrating agent in various industries.

• P2O5 is also known as phosphorus pentoxide.

• It is a white, crystalline solid that is highly hygroscopic.

• P2O5 is commonly used in the production of phosphoric acid.

• It is also used as a drying agent in organic synthesis reactions.

• P2O5 reacts violently with water to form phosphoric acid.