Carbohydrate Tests Assessment 1 Lab

Which test gives a purple ring at the junction of two solutions, indicating the presence of carbohydrates?

• Benedict’s Test

• Molisch’s Test

• Fehling’s Test

• Tollen’s Test

What color change indicates a positive result in Benedict’s Test?

• Purple ring

• Green ring

• Brick-red precipitate

• Black precipitate

Which test distinguishes between reducing and non-reducing sugars?

• Fehling’s Test

• Iodine Test

• Osazone Test

• Bial’s Test

What is the identifying result for sucrose and maltose in the Osazone Test?

• No crystals formed

• Broomlike/fanlike crystals

• Cottonball/puff crystals

• Sunflower-like crystals

Which test produces a silver mirror as a positive result for reducing sugars?

• Benedict’s Test

• Molisch’s Test

• Tollen’s Test

• Anthrone Test

Which test forms cottonball or puff-shaped crystals with lactose?

• Molisch’s Test

• Bial’s Test

• Osazone Test

• Fehling’s Test

Which test turns blue in the presence of starch?

• Benedict’s Test

• Iodine Test

• Tollen’s Test

• Molisch’s Test

Which test detects all types of carbohydrates?

• Tollen’s Test

• Fehling’s Test

• Anthrone Test

• Iodine Test

Which test is positive for pentoses but gives a negative result for hexoses?

• Molisch’s Test

• Iodine Test

• Bial’s Test

• Osazone Test

What is the color result of a positive Seliwanoff’s Test for ketoses?

• Blue-black

• Deep cherry-red

• Red

• Purple ring