Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: In the iodometric titration starch is used as an indicator. Reason: Starch is a polysaccharide.A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
C) If assertion is true statement but reason is false.
D) If both assertion and reason are false.
Correct Answer: B
Solution :
Starch solution gives a blue (purple) colour with a drop of iodine solution because it form a starch iodide complex which is purple in colour. When it is titrated its colour disappear. So it is used in iodometric titration as an indicator. Starch is a polysaccharide. So, both the statements are true but reason is not correct explanation of assertion.
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