Which statements are true for redox indicators? i. The color change occurs when the indicator goes from its oxidized form to its reduced

form or vice versa.

ii. The color for the reduced 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 Eo = 0.059/n

iv. The color for the oxidized state of the indicator occurs when the ratio of the reduced state

to the oxidized state 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