10+ Junior Chemist Interview Questions and Answers

Iron has atomic number 26 and mass number 56. There are several types of iron ore found in India. It is categorized as a transition metal and is widely used in the steel industry.

• Atomic number of iron is 26 and its mass number is 56

• India has several types of iron ore including hematite, magnetite, and limonite

• Iron is categorized as a transition metal

• Iron is widely used in the steel industry for making construction materials, vehicles, and machinery

Chemical isolation from natural products involves extraction, purification, and characterization techniques.

• Extraction: Use solvents to separate the desired chemical from the natural product.

• Purification: Employ techniques like chromatography or distillation to remove impurities.

• Characterization: Analyze the isolated chemical using spectroscopy or other methods to determine its structure and properties.

Concrete mix design is the process of determining the proportions of cement, water, aggregates, and admixtures to produce concrete with desired properties.

• Concrete mix design involves selecting the appropriate ingredients and their proportions to achieve the desired strength, workability, and durability of concrete.

• The mix design is typically based on the specific requirements of the project, such as strength grade, exposure conditions, and construction methods.

• Codes of mix d...read more

Separation of different components from a mixture is done through various techniques based on their physical and chemical properties.

• Separation techniques include filtration, distillation, chromatography, and extraction.

• Filtration is used to separate solid particles from a liquid.

• Distillation is used to separate liquids with different boiling points.

• Chromatography separates components based on their affinity for a stationary phase.

• Extraction separates components based on thei...read more

HPLC, LCMS, and GCMS are analytical techniques used in chemistry to separate, identify, and quantify components in a mixture.

• HPLC stands for High Performance Liquid Chromatography and is used to separate and quantify components in a liquid mixture.

• LCMS stands for Liquid Chromatography Mass Spectrometry and is used to identify and quantify components in a liquid mixture.

• GCMS stands for Gas Chromatography Mass Spectrometry and is used to separate, identify, and quantify compone...read more

Sodium doesn't react with our blood because it is present in the form of sodium ions, which are stable and do not readily react with other substances.

• Sodium in our blood is present in the form of sodium ions (Na+), which are stable and do not react with other substances.

• The sodium ions are essential for various physiological functions in the body, such as nerve transmission and muscle contraction.

• If sodium were to react with our blood, it could lead to serious health complica...read more

Potentiometric titration is a method of chemical analysis that measures the voltage change in a solution as a titrant is added.

• Potentiometric titration involves measuring the potential difference between a reference electrode and a measuring electrode as titrant is added to the solution.

• The endpoint of the titration is determined by a sudden change in voltage, indicating the completion of the reaction.

• Common applications of potentiometric titration include determining the con...read more

Slump is a measure of the consistency of fresh concrete. Types include true slump, shear slump, and collapse slump.

• Slump is a test used to determine the workability of concrete.

• True slump is when concrete subsides evenly without disintegration.

• Shear slump is when one half of the concrete mass slides down.

• Collapse slump is when concrete collapses completely.

• Slump test involves filling a mold with concrete, then removing the mold and measuring the subsidence.

Benzene is a cyclic hydrocarbon with a hexagonal ring structure and alternating double bonds.

• Benzene has a molecular formula of C6H6.

• It consists of six carbon atoms arranged in a hexagonal ring.

• Each carbon atom is bonded to one hydrogen atom.

• The carbon-carbon bonds in benzene alternate between single and double bonds.

• The alternating double bonds create a resonance structure, resulting in a stable and planar molecule.

• Benzene is a highly aromatic compound and is commonly used a...read more

Titration is a technique used in chemistry to determine the concentration of a substance in a solution by reacting it with a known concentration of another substance.

• Titration involves adding a solution of known concentration (titrant) to a solution of unknown concentration (analyte) until the reaction between the two is complete.

• The point at which the reaction is complete is called the equivalence point, which is usually determined using an indicator or pH meter.

• Titration ca...read more

There are 118 elements in nature.

• There are 118 known elements in the periodic table.

• Elements range from hydrogen (atomic number 1) to oganesson (atomic number 118).

• Each element has unique properties and characteristics.

• Elements can combine to form compounds, molecules, and materials.

Sulphuric acid is a strong mineral acid with the chemical formula H2SO4.

• Chemical formula: H2SO4

• Composed of 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms

• Commonly used in various industrial processes such as battery production and metal cleaning

Concrete is a strong and durable building material made from a mixture of cement, sand, gravel, and water.

• Concrete is composed of cement, sand, gravel, and water in specific proportions.

• It is used in construction for building foundations, roads, bridges, and more.

• Concrete can be reinforced with materials like steel to increase its strength.

• There are different types of concrete, such as ready-mix concrete and precast concrete.

Molality is the concentration of a solution expressed in moles of solute per kilogram of solvent.

• Molality is different from molarity as it takes into account the mass of the solvent.

• It is calculated by dividing the moles of solute by the mass of the solvent in kilograms.

• For example, a solution containing 0.5 moles of NaCl in 1 kg of water has a molality of 0.5 mol/kg.

• Molality is commonly used in colligative property calculations.

• It is also useful in determining the freezing p...read more