NEET Chemistry Titrations MCQ Question
Which of the following colour changes shown during redox titrations is not correct?
Cr₂O₇²⁻ oxidises the indicator diphenylamine to produce blue colour showing end point.
Iodine formed by oxidation of I⁻ ions gives blue colour with starch showing end point.
KMnO₄ in the form of MnO₄⁻ ions gives pink colour showing end point.
Thiosulphate ions (S₂O₃²⁻) give blue colour showing end point.
Correct Answer
Detailed Explanation
Thiosulphate ions do not give a blue color at the endpoint; this is incorrect. The blue color is typically associated with iodine-starch complex.
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