MCQOPTIONS
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| 1. |
A pink coloured dye complex is formed when air containing NO2 is passed in an absorbing solution consisting of __________ and diamine dissolved in the acetic acid medium. |
| A. | Sulphuric acid |
| B. | Sulphonyl |
| C. | Sulphonic acid |
| D. | Sulphanilic acid |
| Answer» E. | |