quality-GC (video)

What is the purpose of gas chromatography?

• Separation of volatile compounds

• Separation of non-volatile compounds

• Identification of unknown samples

• Detection of water vapor

What are the two types of columns used in gas chromatography?

• Packed column and capillary column

• Stainless steel column and nitrogen column

• Steel column and quartz column

• Glass column and hydrogen column

In gas chromatography stationary phase is made up of ......

• Unreactive gas such as nitrogen

• Inert gas like helium

• Fused quartz

• Silicon grease or wax

What is the purpose of the molecular sieve in gas chromatography?

• Separates unwanted hydrocarbons

• Separates unwanted oxygen

• Separates unwanted water vapor

• All of the above

What is the purpose of the septum in gas chromatography?

• Detects the sample

• Separates unwanted compounds

• Allows injection of the sample

• Maintains uniform temperature

What is the temperature range for the injection region in gas chromatography?

• 150 to 300 degree Celsius

• 20 to 50 degree Celsius

• 100 to 150 degree Celsius

• 50 to 100 degree Celsius

How does separation occur in gas chromatography?

• Based on the type of detector used

• Based on the length of the column

• Based on the interaction of molecules between the mobile phase and the stationary phase

• Based on the temperature of the injection region

What is the purpose of the flame ionization detector in gas chromatography?

• Separates unwanted compounds

• Detects the sample

• Maintains uniform temperature

• Produces a flame

Answer explanation

The primary purpose of the flame ionization detector is to detect organic compounds that are separated by the GC column

What does the area under the peak in gas chromatography indicate?

• Concentration of the sample

• Length of the column

• Type of detector used

• Retention time of the sample

Answer explanation

less concentration, less area under the peak and vice versa

How can unknown samples be detected in gas chromatography?

• By comparing retention time with known standards

• By maintaining uniform temperature

• By using a capillary column

• By using a back column