Srikem Laboratories QA Chemist Interview Questions and Answers

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.

• pH is determined by the concentration of hydrogen ions in a solution.

• Examples: Lemon juice has a pH of around 2, while baking soda has a pH of around 9.

PH represents the concentration of hydrogen ions in a sample.

• PH is measured on a scale of 0-14, with 7 being neutral.

• A lower PH indicates higher acidity, while a higher PH indicates higher alkalinity.

• PH can be measured using a PH meter or through chemical indicators.

• The PH of a sample can affect its chemical properties and reactions.

LOD stands for Limit of Detection. It is the lowest concentration of a substance that can be reliably detected.

• LOD is used to determine the sensitivity of an analytical method.

• It is usually expressed as a concentration or mass.

• Water is a chemical compound composed of hydrogen and oxygen, while LOD is a term used in analytical chemistry.

• LOD is important in environmental testing to determine the presence of contaminants ...read more

The interview question covers topics such as Lewis acid, pH, acid and base, organic chemistry, periodic table, chemical formulas, and pH measurement without a pH meter.

• Lewis acid is an electron acceptor, examples include AlCl3 and FeCl3

• pH is a measure of acidity or basicity, with a range of 0-14

• Acids donate H+ ions, bases accept H+ ions

• Organic chemistry deals with carbon-based compounds, examples include ethanol and gl...read more

Benzene is a colorless, highly flammable liquid with a sweet odor. It is a basic building block of many chemicals.

• Benzene is a hydrocarbon with the chemical formula C6H6.

• It is a natural constituent of crude oil and gasoline.

• Benzene is used in the production of plastics, synthetic fibers, rubber, dyes, detergents, and pharmaceuticals.

• Exposure to benzene can cause cancer and other health problems.

• Benzene is also a major ...read more

Water has a boiling point of 100°C and a melting point of 0°C. Other solvents have varying boiling and melting points.

• Water has a high boiling point due to its strong hydrogen bonding

• Solvents like ethanol have lower boiling points than water

• Melting points of solvents depend on their molecular structure

• Some solvents like mercury are liquid at room temperature

• Boiling and melting points are important in chemical reactions