Verified Solution • 2025–26 Session moderate

QJEEM22Chae3c: JEE Main 2022 Chemistry - Class 12 JEEM22Chae3c Solution: For kinetic study of the reaction of iodide ion with at room…

For kinetic study of the reaction of iodide ion with H2O2\mathrm{H}_{2} \mathrm{O}_{2} at room temperature :

(A) Always use freshly prepared starch solution.

(B) Always keep the concentration of sodium thiosulphate solution less than that of KI solution.

(C) Record the time immediately after the appearance of blue colour.

(D) Record the time immediately before the appearance of blue colour.

(E) Always keep the concentration of sodium thiosulphate solution more than that of KI solution.

Choose the correct answer from the options given below :

Multiple Choice Options

  • A (A),(B),(C)(\mathrm{A}),(\mathrm{B}),(\mathrm{C}) only
  • B (A),(D),(E)(\mathrm{A}),(\mathrm{D}),(\mathrm{E}) only
  • C (D),(E)(\mathrm{D}),(\mathrm{E}) only
  • D (A),(B),(E)(\mathrm{A}),(\mathrm{B}),(\mathrm{E}) only

Step-by-Step Verified Solution

To minimize contamination, use freshly prepared starch solution to determine end point. As KI\mathrm{KI} is used in excess to consume all the H2O2\mathrm{H}_{2} \mathrm{O}_{2} the concentration of sodium thiosulphate solution is less than KI\mathrm{KI} solution. After appearance of blue colour record the time immediately.

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