Which of the following colour changes shown during redox titrations is

1.	Which of the following colour changes shown during redox titrations is not correct ?
Answer» `Cr_(2)O_(7)^(2-)` oxidises the indicator diphenylamine to produce blue colour showing end point. Iodine formed by OXIDATION of `I^(-)` ions givesblue colour with starch showing end point. `KMnO_(4)` in the FORM of `MnO_(4)^(-)` ions gives pink colour showing end point. THIOSULPHATE ions `(S_(2)O_(3)^(2-))` give blue colour showing end point. Solution :Thiosulphate ions do not act as indicator and do not indicate end point by change in colour.

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