Test the presence of adulterant metanil yellow in dal
To test the presence of metanil yellow in dal, take the following steps:
- Take approximately 5 gms of dal in a test tube and add 5 ml of water.
- Shake the test tube well.
- Add few drops of concentrated hydrochloric acid to the test tube. (This activity should be done in the presence of your school teacher).
- The appearance of a pink colour in the solution confirms the presence of metanil yellow in dal
(MCQs asked in CBSE examination)
Q1: Metanil yellow changes the colour of solution of dal to
(a) green
(b) pink
(c) blue
(d) dark red