Lark Laboratories (I) Interview Questions and Answers

Sulphuric acid has an atomic number of 16.

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

• The atomic number of sulphur is 16, which is the number of protons in the nucleus of a sulfur atom.

• Therefore, the atomic number of sulphuric acid is also 16.

A distillation column is a vertical vessel used to separate components of a liquid mixture based on their boiling points.

• Consists of trays or packing material to increase surface area for vapor-liquid contact

• Operates by heating the mixture to create vapor, which rises through the column

• Different components condense at different heights and are collected separately

• Commonly used in industries such as oil refining and chemical processing

Distillation is a process used to separate components of a liquid mixture based on their boiling points.

• Distillation involves heating the mixture to vaporize the more volatile components, then condensing the vapor back into liquid form.

• Types of distillation include simple distillation, fractional distillation, and steam distillation.

• Simple distillation is used to separate components with significantly different boiling points, while fractional distillation is used for closer ...read more

Distillation is a process of separating components of a mixture based on their boiling points. Different types of valves are used in distillation process.

• Distillation is a process of separating components of a mixture based on their boiling points

• Types of valves used in distillation process include gate valves, globe valves, ball valves, and needle valves

• Gate valves are used for on/off control, globe valves for regulating flow, ball valves for quick shut-off, and needle valve...read more

pH is a measure of the acidity or alkalinity of a solution on a scale of 0 to 14.

• pH stands for 'potential of Hydrogen'

• It is a logarithmic scale, with lower values indicating acidity, higher values indicating alkalinity, and 7 being neutral

• Common examples: lemon juice (pH 2), water (pH 7), baking soda (pH 9)

Distillation is a process of separating components in a liquid mixture based on their boiling points. Types include simple, fractional, and steam distillation.

• Distillation is a separation process used to purify liquids by heating and cooling them to separate components based on their boiling points.

• Simple distillation is used for separating components with a large difference in boiling points, while fractional distillation is used for components with closer boiling points.

• Ste...read more