Question

59. Acidic dyes used in Fajan's method
a) Phenol
b) Rhodamine series
c) Fluorescein
d) Thymol blue
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Answer 1

Answer:

c) Fluorescein

Explanation:

I think it is the correct answer.

Answer 2

Acidic dyes used in Fajan's method is dichlorofluorescein.

Explanation:

The correct answer is option c) dichlorofluorescein

In Fajan's method the indicator dichlorofluorescein is used; the end-point is marked by the green suspension turning pink.

a) Phenol- Phenol is a crystalline solid that is white in color and should be handled with caution because it can cause chemical burns. It was not a Acidic dyes used in Fajan's method.

b) Rhodamine series- Rhodamine dyes are the most important class of laser materials, with rhodamine 6G being the most important. It was not a Acidic dyes used in Fajan's method.

d) Thymol blue-​ Thymol blue  is a crystalline powder that is brownish-green or reddish-brown in color and is used as a pH indicator. It was not a Acidic dyes used in Fajan's method.

Some option mentioned in the question are incorrect, the correct option with question is mentioned below;

Acidic dyes used in Fajan's method

a) Phenol

b) Rhodamine series

c) dichlorofluorescein

d) Thymol blue