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1. |
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? |
A. | Sodium tetra chloromercurate |
B. | Dicholorosulphitomercurate complex |
C. | Ammonia molybdate |
D. | Paraosaniline sulphonic acid |
Answer» E. | |