Assertion`:` In the iodometric titration, starch is used as an indicator.
Reason `:` Starch is a polysaccharide.

Options

A. If both the assertion and reacons are true and reason is a true explanation of the assertion.
B. If both the assertion and reasons are true but the reason is not the correct explanation of assertion.
C. If the assertion is ture but reason is false.
D. If assertion is false but reasion is true.

Answer

B

Explanation

Starch `(C_(6)H_(10)O_(5))_(n)` is a polysaccharide. It consists of two fractions `-` one is known as `alpha-`amylose or amylopectin. In iodimetric 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.