10+ Lab Chemist Interview Questions and Answers for Freshers

H2SO4 has a higher concentration than HCl.

• Concentration is determined by the number of moles of solute per unit volume of solution.

• H2SO4 has a higher molar mass than HCl, so the same volume of H2SO4 will contain more moles of solute.

• Therefore, H2SO4 has a higher concentration than HCl.

• For example, if we have 100 mL of 1 M H2SO4 and 100 mL of 1 M HCl, the H2SO4 solution will contain more moles of solute.

Normality, molarity, molality, and molarity are different units of concentration used in chemistry.

• Normality is a measure of the concentration of a solute in a solution based on its equivalent weight.

• Molarity is a measure of the concentration of a solute in a solution based on the number of moles of solute per liter of solution.

• Molality is a measure of the concentration of a solute in a solution based on the number of moles of solute per kilogram of solvent.

• Molarity is simila...read more

There are multiple test methods for Chemical Oxygen Demand (C.O.D), including open reflux method, closed reflux method, and sealed tube method.

• Open reflux method involves boiling the sample in a reflux apparatus with a strong oxidizing agent.

• Closed reflux method uses a sealed digestion tube to heat the sample with a strong oxidizing agent.

• Sealed tube method involves placing the sample in a sealed tube with a strong oxidizing agent and heating it.

• Other methods may include the ...read more

Acetic acid is a weak acid commonly found in vinegar.

• Acetic acid is the main component of vinegar.

• It has a chemical formula of CH3COOH.

• It is a weak acid because it only partially dissociates in water.

• Other examples of weak acids include citric acid, formic acid, and carbonic acid.

I have a positive opinion of battery companies.

• I believe battery companies play a crucial role in advancing technology and sustainability.

• I am impressed by the innovation and development of new battery technologies.

• I think battery companies have the potential to make a significant impact on the environment and reduce our dependence on fossil fuels.

• For example, Tesla's development of electric car batteries has revolutionized the automotive industry.

• Overall, I have a favorable ...read more

Electrochemistry is the study of chemical reactions that involve the transfer of electrons.

• Electrochemistry is used in batteries, fuel cells, and corrosion prevention.

• It is also used in electroplating, electrolysis, and sensors.

• Electrochemistry plays a crucial role in the field of biochemistry and medicine.

• It is used to measure the electrical activity of the brain and heart.

• Electrochemical techniques are used in drug discovery and development.

An acid is a chemical substance that donates protons or accepts electrons, leading to the formation of positively charged ions.

• Acids have a sour taste and can corrode metals.

• They turn blue litmus paper red.

• Common examples include hydrochloric acid (HCl), sulfuric acid (H2SO4), and acetic acid (CH3COOH).

Salt is a compound formed by the reaction of an acid with a base, consisting of positive and negative ions.

• Salt is composed of ions, which are electrically charged particles.

• It is formed through a chemical reaction between an acid and a base.

• Salt is commonly used as a seasoning or preservative in food.

• Examples of salts include sodium chloride (table salt), potassium nitrate (saltpetre), and calcium carbonate (chalk).

Viscosity is the measure of a fluid's resistance to flow.

• Viscosity is affected by temperature and pressure.

• It is measured in units of poise or centipoise.

• High viscosity fluids are thick and flow slowly, while low viscosity fluids are thin and flow quickly.

• Examples of high viscosity fluids include honey and molasses, while water and alcohol are low viscosity fluids.

Viscosity is a measure of a fluid's resistance to flow.

• Viscosity is measured in units of poise or centipoise.

• It is affected by temperature, pressure, and the presence of solutes.

• High viscosity fluids are thick and flow slowly, while low viscosity fluids are thin and flow quickly.

• Examples of high viscosity fluids include honey and molasses, while water and alcohol are low viscosity fluids.