QA QC Chemist

20+ QA QC Chemist Interview Questions and Answers

Updated 10 Feb 2025
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Q1. The number of moles of a solute dissolved in one litre of solution is defined as molarity. Molality is the number of moles of a solute dissolved in one kilogram of a solvent.

Ans.

Molarity is the number of moles of solute in one litre of solution, while molality is the number of moles of solute in one kilogram of solvent.

  • Molarity is expressed in moles per litre (mol/L), while molality is expressed in moles per kilogram (mol/kg).

  • Molarity is temperature dependent due to volume changes, while molality is temperature independent.

  • Molarity is commonly used in laboratory settings, while molality is used in calculations involving colligative properties.

  • Example...read more

Q2. Tell about Working principle of HPLC, GC and difference between them , and beer lambert law

Ans.

HPLC and GC are analytical techniques used to separate and quantify components in a mixture based on their physical and chemical properties.

  • HPLC stands for High Performance Liquid Chromatography and GC stands for Gas Chromatography.

  • HPLC uses a liquid mobile phase and a solid stationary phase to separate components based on their polarity, while GC uses a gas mobile phase and a solid or liquid stationary phase to separate components based on their boiling points.

  • Beer Lambert l...read more

QA QC Chemist Interview Questions and Answers for Freshers

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Q3. What is the deferent between qualitative and quantitative analysis

Ans.

Qualitative analysis focuses on properties and characteristics, while quantitative analysis measures quantities and amounts.

  • Qualitative analysis determines the presence or absence of a substance, while quantitative analysis determines the amount of a substance.

  • Qualitative analysis is descriptive, while quantitative analysis is numerical.

  • Qualitative analysis is used to identify unknown substances, while quantitative analysis is used to determine the concentration of known subs...read more

Q4. what is technical skills?

Ans.

Technical skills refer to the specific knowledge and abilities required to perform tasks related to a particular field or profession.

  • Technical skills are practical and hands-on abilities that are acquired through training, education, and experience.

  • They involve the use of tools, equipment, software, and techniques specific to a particular field.

  • Examples of technical skills for a QA QC Chemist may include proficiency in analytical instruments, knowledge of quality control proc...read more

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Q5. What is this production and QC chemist relation in fight

Ans.

The production and QC chemist relationship is crucial in ensuring the quality of products and maintaining efficiency in the manufacturing process.

  • Collaboration between production and QC chemists is essential for ensuring that products meet quality standards.

  • QC chemists analyze samples to ensure they meet specifications set by production chemists.

  • Communication between the two roles is key to resolving any issues that may arise during production.

  • Production chemists rely on QC d...read more

Q6. what is HPLC principle

Ans.

HPLC principle is based on the separation of compounds using a liquid mobile phase and a solid stationary phase.

  • HPLC stands for High Performance Liquid Chromatography.

  • It is a widely used analytical technique in chemistry and biochemistry.

  • The principle involves the separation of compounds based on their interaction with the stationary phase.

  • The mobile phase, usually a liquid solvent, carries the sample through the stationary phase.

  • Different compounds interact differently with ...read more

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Q7. What is the use of uv spectroscopy

Ans.

UV spectroscopy is used to analyze the electronic transitions in molecules by measuring the absorption of ultraviolet or visible light.

  • UV spectroscopy is commonly used in pharmaceutical industry for drug analysis and quality control.

  • It is also used in environmental testing to detect pollutants in water and air.

  • UV spectroscopy can be used to determine the concentration of a compound in a sample.

  • It helps in identifying functional groups in organic compounds based on their absor...read more

Q8. Which the elements in 1to 10 name?

Ans.

The elements in 1 to 10 are Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon.

  • Hydrogen

  • Helium

  • Lithium

  • Beryllium

  • Boron

  • Carbon

  • Nitrogen

  • Oxygen

  • Fluorine

  • Neon

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Q9. what is technical knowledge

Ans.

Technical knowledge refers to the understanding and expertise in a specific field or subject, including its principles, theories, and practical applications.

  • Technical knowledge involves having a deep understanding of the subject matter and being able to apply it effectively.

  • It includes knowledge of the principles, theories, and concepts related to the field.

  • Technical knowledge also encompasses practical skills and hands-on experience in using tools, equipment, and techniques ...read more

Q10. what beer's law ?

Ans.

Beer's law, also known as the Beer-Lambert law, describes the relationship between the concentration of a solute in a solution and the amount of light absorbed by the solution.

  • Beer's law states that the absorbance of a solution is directly proportional to the concentration of the solute.

  • It is commonly used in spectrophotometry to determine the concentration of a substance in a solution.

  • The equation for Beer's law is A = εcl, where A is the absorbance, ε is the molar absorptiv...read more

Q11. What is this production chemist

Ans.

A production chemist is responsible for developing and implementing processes to manufacture chemical products efficiently and safely.

  • Developing and optimizing chemical processes for manufacturing

  • Ensuring product quality and consistency through testing and analysis

  • Collaborating with other departments to troubleshoot issues and improve processes

  • Following safety protocols and regulations to maintain a safe working environment

Q12. Whose Reference?

Ans.

The question is asking about whose reference is being used in a particular context.

  • Identify the specific reference being mentioned in the context of the question.

  • Consider the source or origin of the reference being discussed.

  • Clarify any confusion by asking for more details or examples if needed.

Q13. What is Ph meter

Ans.

A Ph meter is an instrument used to measure the acidity or alkalinity of a solution.

  • Measures the concentration of hydrogen ions in a solution

  • Consists of a probe and a meter

  • Calibrated using buffer solutions

  • Used in various industries such as food, pharmaceuticals, and water treatment

  • Example: Used to measure the Ph of a swimming pool to ensure safe swimming conditions

Q14. All type of vitamin and protein

Ans.

Vitamins and proteins are essential nutrients for the body's overall health and functioning.

  • Vitamins are organic compounds that are essential for normal growth and metabolism. Examples include Vitamin C, Vitamin D, and Vitamin B12.

  • Proteins are macromolecules made up of amino acids that are crucial for building and repairing tissues. Examples include meat, dairy, and legumes.

Q15. Calibration and Handling of Instrument

Ans.

Calibration and handling of instruments are crucial for accurate and reliable results in QA QC chemistry.

  • Regular calibration of instruments is necessary to ensure accuracy and precision.

  • Proper handling of instruments is important to prevent damage and maintain their performance.

  • Documentation of calibration and maintenance procedures is essential for traceability and quality control.

  • Examples of instruments that require calibration include pH meters, balances, and spectrophotom...read more

Q16. Synthesis the chemical reaction

Ans.

Synthesis of a chemical reaction involves combining reactants to form products through a series of steps.

  • Identify reactants and products

  • Determine the stoichiometry of the reaction

  • Select appropriate reaction conditions (temperature, pressure, catalyst)

  • Follow reaction mechanism to understand the steps involved

  • Purify and isolate the final product

Q17. What is PH value

Ans.

PH value is a measure of the acidity or alkalinity of a solution on a scale of 0-14.

  • PH value below 7 indicates acidity, while above 7 indicates alkalinity

  • Neutral PH is 7, like pure water

  • PH value can affect chemical reactions and biological processes

Q18. What is log H+

Ans.

Log H+ is the logarithm of the concentration of hydrogen ions in a solution.

  • Log H+ is used to measure the acidity of a solution.

  • It is calculated as the negative logarithm of the concentration of hydrogen ions in moles per liter.

  • For example, a solution with a hydrogen ion concentration of 1 x 10^-7 M would have a log H+ of 7.

Q19. Define the inorganic chemistry

Ans.

Inorganic chemistry is the branch of chemistry that deals with the study of inorganic compounds, which do not contain carbon-hydrogen bonds.

  • Focuses on elements other than carbon

  • Studies properties and behavior of inorganic compounds

  • Includes metals, minerals, and non-carbon containing compounds

  • Examines reactions and synthesis of inorganic substances

Q20. Define the organic chemistry

Ans.

Organic chemistry is the branch of chemistry that deals with the study of carbon-containing compounds.

  • Focuses on the structure, properties, composition, reactions, and synthesis of carbon-based compounds

  • Includes the study of hydrocarbons, alcohols, acids, esters, and more

  • Important in pharmaceuticals, petrochemicals, plastics, and other industries

Q21. Nature of edible oil

Ans.

Edible oil is a plant, animal, or synthetic fat used in cooking or frying food.

  • Edible oils can be derived from various sources such as soybean, sunflower, palm, coconut, olive, etc.

  • They are used for cooking, frying, baking, and as a salad dressing.

  • Edible oils are rich in essential fatty acids and vitamins.

  • They have different smoke points, which determine their suitability for different cooking methods.

  • Some common types of edible oils are vegetable oil, canola oil, peanut oil,...read more

Q22. Reson to change

Ans.

I decided to change because I wanted to grow professionally and learn new skills.

  • Desire for professional growth

  • Opportunity to learn new skills

  • Seeking new challenges

  • Better work-life balance

  • Company culture or values misalignment

Q23. 10 chemical name

Ans.

Chemical names are unique identifiers for specific substances used in chemistry.

  • Chemical names can be systematic (following specific rules) or common (based on historical usage)

  • Examples of chemical names include: sodium chloride, hydrogen peroxide, sulfuric acid

Q24. Reaction of all acid

Ans.

Acids react with bases to form salts and water.

  • Acids react with bases to form salts and water

  • Acids can also react with metals to form hydrogen gas and a salt

  • Strong acids like hydrochloric acid can react with carbonates to form carbon dioxide gas, water, and a salt

Q25. Reaction of ammonia

Ans.

Ammonia reacts with acids to form ammonium salts, with metals to form amides, and with halogens to form salts.

  • Ammonia reacts with acids to form ammonium salts (e.g. NH3 + HCl -> NH4Cl)

  • Ammonia reacts with metals to form amides (e.g. 2NH3 + 2Na -> 2NaNH2 + H2)

  • Ammonia reacts with halogens to form salts (e.g. NH3 + HCl -> NH4Cl)

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