Which Statements Are True for Redox Indicators

Which statements are true for redox indicators?
I.The color change occurs when the indicator goes from its oxidized form to its reduced form.
II. The color for the oxidized state of the indicator occurs when the ratio of the reduced state to the oxidized state is 1:10.
III. The range over which the indicator functions is E^o .
IV. The color for the reduced state of the indicator occurs when the ratio of the reduced state to the oxidized state is is 1:10.

A) I,II,III,and IV
B) III and IV
C) I,III,and IV
D) I,II,and IV
E) I,II,and III

Correct Answer:

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