Overview of Qualitative Chemistry

1. What is the primary objective of qualitative chemistry?

• To measure the quantity of substances

• • To identify the presence of specific substances

• • To determine the molecular weight of compounds

• To analyze the rate of chemical reactions

1. Which reagent is commonly used to detect the presence of starch?

• • Benedict's solution

• • Iodine solution

• •  Biuret reagent

• Silver nitrate

1. Who is known for developing the systematic methods of qualitative analysis?

• • Antoine Lavoisier

• • Robert Boyle

• • Jöns Jakob Berzelius

• Dmitri Mendeleev

1. What type of reaction is used to identify chloride ions in a solution?

• • Precipitation reaction

• • Redox reaction

• Acid-base reaction

• • Complexation reaction

1. Which qualitative analysis technique uses color change to detect the presence of reducing sugars?

• • Biuret test

• • Benedict's test

• • Iodine test

• • Litmus test

6. Why is qualitative analysis important in food technology?

•  To determine the exact concentration of nutrients

• • To identify the presence of contaminants and ensure safety

• To measure the caloric value of food products

• To calculate the shelf life of food items

6. How does paper chromatography work in separating food colorings?

• • By precipitating compounds based on solubility

• • By separating compounds based on their boiling points

• By separating compounds based on their affinity to the stationary phase

• • By changing the pH of the solution

6. What is the purpose of the Biuret test in qualitative analysis?

• • To detect the presence of reducing sugars

•  To identify proteins in a sample

• • To test for the presence of starch

• • To measure acidity in a solution

9. In an online simulation, you test a food sample and observe a color change with iodine. What does this indicate?

• • Presence of proteins

• •  Presence of starch

• • Presence of fats

• • Presence of sugars

Tags

NGSS.MS-PS1-2

How would you use the flame test to identify the presence of sodium ions in a sample?

• • By observing the color change to orange-yellow

• • By detecting a white precipitate

• • By measuring the solution's pH

• • By seeing a color change in the iodine test