question_answer

  The teacher asked the students to record correctly results of the experiment done to detect the presence of metanil yellow in the adulterated arhar dal sample that was provided to them.

	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.

Which is the correct recording of the experiment? justify your answer.

Answer:

  B is the correct reading because when HCl is added to a food sample containing metanil yellow, it gives pink colour.                                                                                                                                                                                          (1+1)