Question

Four test tubes of tuhar dal were taken with some water in each and labeled as A, B, C, and D. A few drops of the following were added to these test tubes.

Which test tube would be able to confirm the presence of metanil yellow adulterant?

• A. Test tube A to which NaOH was added.
• B. Test tube B to which HCl was added.
• C. Test tube C to which alcohol was added.
• D. Test tube D to which water was added.

Answer 1

The correct option is B

Test tube B to which HCl was added.

The correct answer is B (Test tube B to which HCl was added).

Explanation of correct answer:

1. To test the adulteration of Metanil yellow in tuhar dal.
2. In the test tube add a few drops of HCl, if the color changes to pink, then the dal is adulterated with metanil yellow.

Explanation for incorrect options:

Option A:

Test tube A to which NaOH was added- No reaction.

Option C:

Test tube C to which alcohol was added- No reaction.

Option D:

Test tube D to which water was added- No reaction.

Final answer: The test tube that would be able to confirm the presence of metanil yellow adulterant is Test tube B to which HCl was added.