The iodine-thiosulphate titration relies on starch as an indicator. What is the role of starch in th

Q: What is the correct answer for NCERT11?

The correct answer is C. Starch forms an intense blue complex with iodine (I₂). In iodine-thiosulphate titrations, starch is added when most of the iodine has reacted. The blue colour appears due to the remaining iodine. As the titration proceeds and all iodine is consumed by thiosulphate, the blue colour disappears, signaling the end-point.

Q: The iodine-thiosulphate titration relies on starch as an indicator. What is the role of starch in this titration?

The correct answer is C. Starch forms an intense blue complex with iodine (I₂). In iodine-thiosulphate titrations, starch is added when most of the iodine has reacted. The blue colour appears due to the remaining iodine. As the titration proceeds and all iodine is consumed by thiosulphate, the blue colour disappears, signaling the end-point.

Q: What are the options for this NCERT11 question?

A. To catalyze the reaction. · B. To precipitate the products. · C. To give an intense blue colour with iodine, which disappears when iodine is consumed. · D. To maintain the pH of the solution.

Question

The iodine-thiosulphate titration relies on starch as an indicator. What is the role of starch in this titration?

FirstInTest · Accepted Answer

Starch forms an intense blue complex with iodine (I₂). In iodine-thiosulphate titrations, starch is added when most of the iodine has reacted. The blue colour appears due to the remaining iodine. As the titration proceeds and all iodine is consumed by thiosulphate, the blue colour disappears, signaling the end-point.

Answer

To catalyze the reaction.

Answer

To precipitate the products.

Answer

To give an intense blue colour with iodine, which disappears when iodine is consumed.

Answer

To maintain the pH of the solution.

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