First slide

Polysaccharides

Question

Statement 1: In the iodometric titration, starch is used as an indicator.
Statement 2: Starch is a polysaccharide.

Moderate

A

Both statements 1 and 2 are correct
B

Statement 1 is correct statement 2 is incorrect
C

Statement 1 is incorrect and statement 2 is correct
D

Both statements 1 and 2 are incorrect

Solution

Starch (C₆H₁₀O₅)_n is a polysaccharide. It consists of two fractions-one is known as $α$ -amylose and the other is $β$ -amylose or amylopectin. In iodometric and iodometric titrations, starch solution is used as an indicator. It gives blue or violet colour with free iodine. At the end point, the blue or violet colour disappears when iodine is completely changed to iodide.

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