Hindustan Unilever Interview Questions and Answers

Chromatography is a technique used to separate and analyze mixtures based on their different interactions with a stationary phase and a mobile phase.

• Types of chromatography include gas chromatography, liquid chromatography, ion exchange chromatography, affinity chromatography, and size exclusion chromatography.

• Gas chromatography separates compounds based on their volatility and interaction with a stationary phase inside a column.

• Liquid chromatography separates compounds based...read more

Spectroscopy is the study of the interaction between matter and electromagnetic radiation. Different types include UV-Vis, IR, NMR, and MS.

• UV-Visible Spectroscopy: Used for analyzing the electronic transitions in molecules, determining concentration of a substance, and identifying unknown compounds.

• Infrared Spectroscopy: Used for identifying functional groups in organic molecules, determining molecular structure, and analyzing chemical bonds.

• Nuclear Magnetic Resonance (NMR) S...read more

Chemistry is the study of matter, its properties, composition, and interactions.

• Chemistry is a branch of science that deals with the composition, structure, properties, and reactions of matter.

• It involves understanding the behavior of atoms and molecules, and how they interact to form new substances.

• Chemistry is essential in various industries such as pharmaceuticals, agriculture, and manufacturing.

• Examples include studying the properties of elements on the periodic table, an...read more

Structures of toluene, methanol, ethanol, and ethylene glycol.

• Toluene has a benzene ring with a methyl group attached.

• Methanol has a single carbon atom with a hydroxyl group attached.

• Ethanol has two carbon atoms with a hydroxyl group attached to one of them.

• Ethylene glycol has two carbon atoms with two hydroxyl groups attached.

Assay in drug substance is a test used to determine the potency or concentration of a drug in a sample.

• Assay is a quantitative analysis method used to measure the amount of a specific substance in a sample.

• It is commonly used in pharmaceutical industry to ensure the quality and consistency of drug products.

• Assay results are compared to a standard reference to determine the potency or concentration of the drug.

• Examples of assays include HPLC (High Performance Liquid Chromatogr...read more

Alcoa stands for Analytical Laboratory Control on Arrival, a process used in the pharmaceutical industry to ensure the quality of raw materials.

• Alcoa is a set of guidelines used to ensure data integrity in pharmaceutical manufacturing.

• It stands for Attributable, Legible, Contemporaneous, Original, and Accurate.

• Alcoa principles are used to ensure the reliability and accuracy of data in pharmaceutical testing and analysis.

• For example, ensuring that all data is attributable to a...read more

Assay formula is a specific calculation used to determine the concentration or purity of a substance in a sample.

• Assay formula typically involves measuring the amount of a specific compound or molecule in a sample.

• It may involve using a standard curve to determine the concentration of the substance.

• Assay formulas can vary depending on the type of assay being performed, such as ELISA or PCR.

• Examples include calculating the protein concentration in a sample using a Bradford ass...read more

Standard agreement formula is a legally binding document outlining terms and conditions agreed upon by parties involved.

• Include names and signatures of all parties involved

• Clearly outline the terms and conditions of the agreement

• Specify the duration of the agreement

• Include clauses for termination and dispute resolution

• Ensure the agreement is legally binding and enforceable