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In the study of oxidation of iodide ions...

In the study of oxidation of iodide ions by hydrogen peroxide in presence of an acid and starch as a clock reaction,

A

thiosulphate added should be in large amount

B

thiosulphate added should be in small amount

C

amount of thiosulphate added has no importance

D

thiosulphate is added to speed up the reaction

Text Solution

Verified by Experts

The correct Answer is:
B

Thiosulphate added should be in small amount so that it reacts away with iodine and the iodine further liberated can give blue colour with starch.
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In the study of oxidation of iodide ions by hydrogen peroxide in presence of dilute H_(2)SO_(4) and starch as a clock reaction, if excess of thiosulphate is added

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Knowledge Check

  • In the study of oxidation of iodide ions by hydrogen peroxide in presence of dilute H_(2)SO_(4) and starch as a clock reaction, if excess of thiosulphate is added

    A
    blue colour will appea immediately
    B
    blue colour will not appear at all
    C
    blue colour will appear only on heating the reaction mixture
    D
    blue colour will appear after a very long time
  • In the study of oxidation of iodide ions by hydrogen peroxide in presence of dilute H_(2)SO_(4) , thiosulphate and starch as a clock reaction, if concentration of iodide ions is increased

    A
    less time will be taken for blue color to appear
    B
    more time will be taken for blue colour to appear
    C
    same time will be taken for blue colour to appear
    D
    any one of the above can happen depending upon the amount of `H_(2)SO_(4)` present.
  • Oxidation state of oxygen in hydrogen peroxide is -

    A
    `-1`
    B
    `+1`
    C
    zero
    D
    `-2`