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Chemistry
Which of the following colour changes shown during redox titrations is not correct?
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Q. Which of the following colour changes shown during redox titrations is not correct?
Redox Reactions
A
$Cr_2O_7^{2-}$ oxidises the indicator diphenylamine to produce blue colour showing end point.
15%
B
Iodine formed by oxidation of $I^-$ ions gives blue colour with starch showing end point.
40%
C
$KMnO_4$ in the form of $MnO_4^-$ ions gives pink colour showing end point.
34%
D
Thiosulphate ions $(S_2O_3^{2-})$ give blue colour showing end point.
11%
Solution:
Thiosulphate ions do not act as indicator and do not indicate end point by change in colour.