Cohizon Life Sciences Limited ETP Chemist Interview Questions and Answers

Acidity is the measure of the concentration of hydrogen ions in a solution.

• Acidity is measured on the pH scale, which ranges from 0 to 14.

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

• Acidity can affect the properties and behavior of substances, such as their solubility and reactivity.

• Examples of acidic substances include vinegar, lemon juice, and battery acid.

Indicators are used in quality control to determine the endpoint of a reaction or to indicate the presence of a specific substance.

• Indicators are used in titrations to determine the endpoint of a reaction.

• They can also be used to indicate the presence of a specific substance in a sample.

• Common indicators include litmus paper, phenolphthalein, and methyl orange.

• Indicators can be organic compounds or inorganic compounds.

• ...read more

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

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

• The point at which the reaction is complete is called the endpoint.

• The endpoint is usually detected using an indicator, which changes color when the re...read more

Material testing involves analyzing the physical and chemical properties of materials to determine their suitability for specific applications.

• Material testing can include tests for strength, durability, corrosion resistance, and thermal properties.

• Common methods of material testing include tensile testing, hardness testing, and spectroscopy.

• Material testing is important in industries such as construction, aerospace, a...read more

Sieves are often round in shape due to their efficiency in separating particles evenly.

• Round shape allows for equal distribution of particles across the sieve

• Round shape minimizes the chances of particles getting stuck in corners or edges

• Round sieves are easier to handle and stack compared to other shapes

• Round shape promotes better flow of materials through the sieve

BIS stands for Bureau of Indian Standards.

• BIS is the national standards body of India.

• It is responsible for the development and implementation of standards across various sectors.

• BIS ensures quality, safety, and reliability of products and services.

• It provides certification and testing services to ensure compliance with standards.

• BIS marks are used to indicate that a product meets the required standards.

• Examples of BIS...read more

The pH range of water is typically between 6.5 and 8.5.

• Water with a pH below 6.5 is considered acidic.

• Water with a pH above 8.5 is considered alkaline.

• The pH of water can vary depending on factors such as pollution, minerals, and dissolved gases.

• For example, rainwater is slightly acidic with a pH of around 5.6 due to the presence of carbon dioxide.

• Seawater has a pH of around 8.1, making it slightly alkaline.