Question

For kinetic study of the reaction of iodide ion with H₂O₂ 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 : 

(A) (A), (B), (C) only 

(B) (A), (D), (E) only 

(C) (D), (E) only 

(D) (A), (B), (E) only

Answer 1

(A) (A), (B), (C) only 

The is recorded immediately after the blue colour appears.

Na₂S₂O₃ is kept in limited amount.