In West-Gaeke colourimetric procedure, the intensity of the red purple colour is

Question

In West-Gaeke colourimetric procedure, the intensity of the red purple colour is measured photometically and it is proportional to the concentration of sulphur dioxide. What is the red purple coloured compound?

Options:

A . Sodium tetra chloromercurate

B . Dicholorosulphitomercurate complex

C . Ammonia molybdate

D . Paraosaniline sulphonic acid

Answer: Option D
Answer: (d).Paraosaniline sulphonic acid

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