Verified Solution • 2025–26 Session moderate

QJEEM16Che3ba: JEE Main 2016 Chemistry - Class 11 JEEM16Che3ba Solution: Sodium extract is heated with concentrated HNO 3 before testing …

Sodium extract is heated with concentrated HNO3 before testing for halogens because :

Multiple Choice Options

  • A Silver halides are totally insoluble in nitric acid.
  • B Ag2S and AgCN are soluble in acidic medium.
  • C S2− and CN−, if present, are decomposed by conc. HNO3 and hence do not interfere in the test.
  • D Ag reacts faster with halides in acidic medium.

Step-by-Step Verified Solution

Sodium fusion extract is heated with dilute HNO3 to decompose NaCN or Na2S (if present) to HCN and H2S gases, respectively.

JEE Main 2016 (Online) 10th April Morning Slot Chemistry - Practical Organic Chemistry Question 75 English Explanation

The presence of N or S interferes with the test of halogens by forming precipitate with AgNO3.

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