QC Officer Interview Questions and Answers for Freshers

pH is a measure of acidity or alkalinity. UV spectroscopy is based on the absorption of UV light by molecules. Solutions can be prepared in various concentrations like normal, molar, ppm, ppb. Chemistry is the study of matter and its properties. Molality, molarity, and normality are concentration units in chemistry.

• pH measures the concentration of hydrogen ions in a solution, indicating its acidity or alkalinity.

• UV spectroscopy involves measuring the absorption of ultraviolet...read more

SST parameters and types, and difference between HPLC and UPLC.

• SST parameters include glucose, electrolytes, liver enzymes, and more.

• Types of SST include plain, gel, and clot activator.

• HPLC uses high pressure to separate compounds, while UPLC uses even higher pressure for faster separation.

• HPLC is better for larger molecules, while UPLC is better for smaller molecules.

• Both are used in pharmaceutical and biotech industries for drug development and quality control.

Preparation of solutions like Normal, Molar, ppm, ppb, etc.

• Normal solutions are prepared by dissolving a known weight of solute in a known volume of solvent.

• Molar solutions are prepared by dissolving a known number of moles of solute in a known volume of solvent.

• ppm (parts per million) solutions are prepared by dissolving a known weight of solute in a known volume of solvent and expressing the concentration in parts per million.

• ppb (parts per billion) solutions are prepared b...read more

Melting range is the temperature range at which a substance melts, while melting point is the temperature at which it fully melts.

• Melting range is a range of temperatures at which a substance starts to melt and finishes melting.

• Melting point is the temperature at which a substance fully melts and becomes a liquid.

• Melting range is usually wider than melting point.

• Melting range is affected by impurities in the substance.

• Example: The melting range of pure water is 0-100°C, while...read more

PH stands for potential of hydrogen. It is a measure of the acidity or alkalinity of a solution.

• PH is a scale that ranges from 0 to 14.

• A pH of 7 is considered neutral, below 7 is acidic, and above 7 is alkaline.

• The lower the pH value, the more acidic the solution is.

• The higher the pH value, the more alkaline the solution is.

• pH is an important parameter in various fields such as chemistry, biology, and environmental science.

• For example, pH is used to measure the acidity of soi...read more

HPLC stands for High Performance Liquid Chromatography, a technique used to separate, identify, and quantify components in a mixture.

• HPLC uses a liquid mobile phase and a stationary phase to separate components based on their chemical properties.

• The stationary phase is typically a column packed with a solid material, while the mobile phase is a liquid solvent.

• The sample is injected into the column and the components are separated based on their affinity for the stationary pha...read more