Vispan Solutions Private Limited Interview Questions and Answers

Karl Fischer reaction is a method for determining the water content in a sample. The instrument used for this reaction is calibrated using standard solutions.

• Karl Fischer reaction is a chemical reaction that involves the titration of water with iodine.

• It is commonly used in analytical chemistry to measure the moisture content in various substances.

• The reaction is based on the principle that iodine reacts with water to form iodide ions.

• The instrument used for Karl Fischer titr...read more

The main components of HPLC are the mobile phase, stationary phase, pump, injector, column, detector, and data acquisition system.

• Mobile phase: The solvent or mixture of solvents that carries the sample through the system.

• Stationary phase: The solid or liquid phase that retains the analytes based on their interactions.

• Pump: Responsible for delivering the mobile phase at a constant flow rate.

• Injector: Introduces the sample into the mobile phase stream.

• Column: Contains the stat...read more

Chromatography is a technique used to separate and analyze mixtures of substances based on their different properties.

• Chromatography involves a stationary phase and a mobile phase.

• The stationary phase is a solid or liquid material that retains the components of the mixture to be separated.

• The mobile phase is a liquid or gas that carries the mixture through the stationary phase.

• Different components of the mixture interact differently with the stationary phase, leading to separ...read more

Nitration reaction is a chemical reaction in which a nitro group (-NO2) is introduced into a molecule.

• Nitration is a type of electrophilic aromatic substitution reaction.

• It involves the substitution of a hydrogen atom on an aromatic ring with a nitro group.

• The reaction is typically carried out using a mixture of nitric acid and sulfuric acid as the nitrating agent.

• Nitration reactions are commonly used in the synthesis of explosives, dyes, pharmaceuticals, and other organic co...read more

pH is a measure of the acidity or alkalinity of a solution.

• pH stands for 'potential of hydrogen'.

• It is a logarithmic scale ranging from 0 to 14.

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

• Each unit change in pH represents a tenfold change in acidity or alkalinity.

• pH is commonly used in various fields such as chemistry, biology, and environmental science.