Procedure | Observation | Inference | |
A | 5 g dal + 5 g metanil yellow. | Dal turns yellow. | Metanil yellow present. |
B | 5 g dal + 5 ml water + 2 drops of HCI. | Solution turns pink. | Metanil yellow present in the sample. |
C | 5 g dal + 5 ml water + pinch of metanil yellow. | Water turns yellow. | Metanil yellow present. |
D | 5 g dal + 5 ml water + 2 drops of HCI. | Metanil yellow present. | Water turns yellow and then pink. |
Answer:
B is the correct reading because
when HCl is added to a food sample containing metanil yellow, it gives pink
colour. (1+1)
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