Class 9 Exam > Class 9 Notes > Science Class 9 > Procedure - Test for the presence of the adulterant ‘Metanil Yellow’ in dal, Biology, Science
Procedure - Test for the presence of the adulterant ‘Metanil Yellow’ in dal, Biology, Science | Science Class 9 PDF Download
Materials Required
Real Lab Procedure
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Take a clean test tube from the test tube rack.
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Transfer some dal into this test tube using a spatula.
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Pour some distilled water into this test tube.
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Shake the solution properly to mix the compounds.
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Allow it to stand for 30 minutes.
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Draw out concentrated hydrochloric acid from its bottle using a dropper.
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Add a few drops of concentrated hydrochloric acid into the test solution.
Simulator Procedure (as performed through the Online Labs)
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You can select the food sample by clicking on the corresponding icon.
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Click and drag the distilled water bottle towards the test tube to add water to the test tube containing the food sample.
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Allow the test tube containing sample to stand till the needle of the clock stops moving.
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Click and drag the dropper towards the test tube to add conc.HCl to the test tube.
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Based on your observation, indicate the presence of Metanil yellow in the selected sample by clicking on the ‘Yes’ or 'No' radio button.
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You can redo the experiment by clicking on the ‘Reset’ button.
Note: If the solution turns pink colour, it indicates the presence of adulterant Metanil yellow in the test material.
Observation
On adding conc. Hydrochloric acid to the sample, it turns pink in colour.
Inference
The pink colour indicates the presence of the adulterant Metanil yellow in the test sample.
Precaution
Use conc. Hydrochloric acid judiciously.
The document Procedure - Test for the presence of the adulterant ‘Metanil Yellow’ in dal, Biology, Science | Science Class 9 is a part of the Class 9 Course Science Class 9.
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FAQs on Procedure - Test for the presence of the adulterant ‘Metanil Yellow’ in dal, Biology, Science - Science Class 9
| 1. What is Metanil Yellow and why is it considered an adulterant in dal? |  |
Ans. Metanil Yellow is a synthetic dye that is often added to dal (lentils) to enhance its color and appearance. It is considered an adulterant because it is a harmful chemical that can have negative health effects when consumed in large quantities.
| 2. How does Metanil Yellow affect human health? | |
Ans. Metanil Yellow has been found to be highly toxic and can cause various health problems when consumed. It has been linked to issues such as liver damage, kidney damage, and even cancer. Therefore, it is important to test for its presence in dal to ensure the safety of consumers.
| 3. How can the presence of Metanil Yellow in dal be tested? | |
Ans. The presence of Metanil Yellow in dal can be tested using a simple experiment. A small portion of the dal can be mixed with water and then filtered. The filtered liquid can then be tested with a specific chemical reagent that reacts with Metanil Yellow, causing a color change. If the color change occurs, it indicates the presence of the adulterant.
| 4. Are there any other adulterants that are commonly found in dal? | |
Ans. Yes, apart from Metanil Yellow, there are other adulterants that are commonly found in dal. Some of these include Kesari Dal (a synthetic dye), Urea (a chemical fertilizer), and Arhar Dal (a low-cost substitute). These adulterants can also have negative health effects and it is important to be aware of them.
| 5. What measures can be taken to prevent the adulteration of dal with Metanil Yellow? | |
Ans. To prevent the adulteration of dal with Metanil Yellow, it is important to purchase dal from trusted and reliable sources. Additionally, consumers can also perform simple tests at home to check for the presence of adulterants. Regular awareness campaigns and strict regulations can also help in reducing the occurrence of adulteration in dal.
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