Leben Laboratories Interview Questions, Process, and Tips

Qualitative analysis is subjective and deals with non-numerical data while quantitative analysis is objective and deals with numerical data.

• Qualitative analysis deals with non-numerical data while quantitative analysis deals with numerical data.

• Qualitative analysis is subjective while quantitative analysis is objective.

• Qualitative analysis is used to gain insights and understanding while quantitative analysis is used t...read more

Room temperature is the temperature range that is comfortable for humans and varies between 20-25°C (68-77°F).

• Room temperature is the temperature range that is comfortable for humans.

• It varies between 20-25°C (68-77°F).

• It is the temperature at which most substances are stable and have a moderate rate of reaction.

• It is important to maintain room temperature in certain industries like pharmaceuticals and food processing.

• ...read more

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

• pH stands for 'potential of hydrogen'

• It is measured on a scale of 0-14

• A pH of 7 is neutral, below 7 is acidic, and above 7 is basic

• pH is important in many industries, including food and beverage production, agriculture, and medicine

Conductivity is the measure of a material's ability to conduct electricity.

• Conductivity is a physical property of materials.

• It is measured in siemens per meter (S/m) or millisiemens per centimeter (mS/cm).

• Metals are good conductors of electricity, while non-metals are poor conductors.

• Conductivity is affected by factors such as temperature, pressure, and impurities in the material.

• It is used in various industries, inclu...read more

An analytical balance is a highly sensitive weighing device used to measure small quantities of substances.

• It is used in laboratories for precise measurements

• It can measure up to four decimal places

• It is enclosed in a glass case to prevent air currents from affecting the measurement

• It requires regular calibration to ensure accuracy

The molecular weight of a hydrogen atom is 1.008 u.

• The molecular weight of an atom is the sum of the masses of its protons, neutrons, and electrons.

• The molecular weight of hydrogen is calculated by adding the mass of its one proton and one electron.

• The molecular weight of hydrogen is often used as a reference point for calculating the molecular weight of other elements and compounds.

Molecular weight of water is 18.01528 g/mol.

• The molecular formula of water is H2O.

• The atomic weight of hydrogen is 1.008 and oxygen is 15.999.

• Multiplying the atomic weight of hydrogen by 2 and adding the atomic weight of oxygen gives the molecular weight of water.

• The molecular weight of water is important in various chemical and biological processes.

Friability test is a method to determine the durability of tablets or granules by measuring the amount of powder generated due to friction.

• It is a quality control test performed on tablets or granules.

• The test involves tumbling the tablets or granules in a rotating drum for a specified time.

• After the test, the tablets or granules are weighed to determine the amount of powder generated.

• The test helps to ensure that the ...read more

Coatings can be classified into various types based on their composition and application.

• Organic coatings - made of carbon-based compounds

• Inorganic coatings - made of non-carbon-based compounds

• Metallic coatings - made of metals or metal alloys

• Ceramic coatings - made of ceramics or glass

• Polymer coatings - made of polymers or plastics

• Electroplating coatings - deposition of a metal onto a conductive surface

• Conversion coat...read more