3 + Interview Questions in Chemical Process in Chemical Engineering Page 1 InterviewSolution

1.	Commercial production of calcium carbide requires limestone and __________ as raw materials.
Answer» Commercial production of calcium carbide requires limestone and coke (a form of processed coal) as raw materials. The production process involves heating a mixture of limestone and coke in an electric arc furnace to a temperature of about 2000 °C. This results in a chemical reaction between the limestone and coke, which produces calcium carbide and carbon dioxide as by-products. Calcium carbide is an important industrial chemical, widely used in the production of acetylene gas, which is used as a fuel and a chemical building block. It is also used in the production of other chemicals, such as acetic acid and PVC. The raw materials used to produce calcium carbide are relatively inexpensive and widely available, making it a cost-effective chemical to produce on a large scale.

2.	The most reactive allotropic form of phosphorus is __________ phosphorus.
Answer» White phosphorus, also known as yellow phosphorus, is the most reactive allotropic form of phosphorus. It is a highly reactive, waxy, white or yellowish substance that can ignite spontaneously in air. White phosphorus is the least stable among the different forms of phosphorus and can easily undergo chemical reactions with other substances. Due to its reactivity, it is used in many industrial applications, such as in the production of fertilizers, pesticides, semiconductors, flame retardants, and as a reducing agent in metallurgy. However, it is also toxic and can cause severe burns if it comes into contact with skin.

3.	Which glass is usually used in optical work?
Answer» Lead glass, also known as lead crystal or flint glass, is usually used in optical work. It is a type of glass that contains a high percentage of lead oxide (PbO) which gives the glass a higher refractive index and lower dispersion than normal soda-lime glass, which makes it useful for optical lenses and other optical components. Lead glass has a higher refractive index which means that it bends light more than other types of glass, and a lower dispersion which means that it doesn't spread out different colors of light as much. This makes it ideal for use in lenses and other optical components where clarity and precision are important. Lead glass is also used for creating beautiful glassware, because of its brilliant optical clarity, high refractive index, and high dispersion. It is also a good thermal insulator and has a high electrical resistance.

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