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Q.

For kinetic study of the reaction of idodide 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 :

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a

(D), (E) only

b

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

c

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

d

(A), (B), (C) only

answer is A.

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Detailed Solution

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The is recorded immediately after the blue colour appears.

Na2S2O3 is kept in limited amount.

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For kinetic study of the reaction of idodide 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 :