Iodine Test for Starch

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Questions and Answers

What is the purpose of the iodine test?

  • To detect the presence of protein
  • To detect the presence of sugar
  • To detect the presence of starch (correct)
  • To detect the presence of fat

What color does the iodine-iodide mixture turn when it interacts with helical amylose in the presence of starch?

  • Deep blue (correct)
  • Red
  • Light orange-brown
  • Green

Which two components make up the starch, a plant carbohydrate?

  • Glucose and fructose
  • Amylose and amylopectin (correct)
  • Cellulose and hemicellulose
  • Maltose and sucrose

What color does the iodine-iodide mixture have in an aqueous solution?

<p>Light orange-brown (A)</p> Signup and view all the answers

Which type of polysaccharide is amylopectin?

<p>Branched (C)</p> Signup and view all the answers

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Study Notes

Starch and Iodine Test

  • The purpose of the iodine test is to detect the presence of starch in a substance.

Composition of Starch

  • Starch, a plant carbohydrate, consists of two components: amylose and amylopectin.

Iodine Test Reaction

  • When iodine-iodide mixture interacts with helical amylose in the presence of starch, it turns blue-black in color.

Characteristics of Iodine-Iodide Mixture

  • In an aqueous solution, the iodine-iodide mixture has a brown color.

Type of Polysaccharide

  • Amylopectin is a type of branched polysaccharide.

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