Why is it necessary to boil the sodium fusion extract with concentrated nitric acid before testing f

Q: What is the correct answer for NCERT11?

The correct answer is C. The document states: 'If nitrogen or sulphur is also present in the compound, the sodium fusion extract is first boiled with concentrated nitric acid to decompose cyanide or sulphide of sodium formed during Lassaigne's test. These ions would otherwise interfere with silver nitrate test for halogens.'

Q: Why is it necessary to boil the sodium fusion extract with concentrated nitric acid before testing for halogens if nitrogen or sulphur are also present?

The correct answer is C. The document states: 'If nitrogen or sulphur is also present in the compound, the sodium fusion extract is first boiled with concentrated nitric acid to decompose cyanide or sulphide of sodium formed during Lassaigne's test. These ions would otherwise interfere with silver nitrate test for halogens.'

Q: What are the options for this NCERT11 question?

A. To increase the solubility of silver halides. · B. To oxidize halogens to their ionic form. · C. To decompose cyanide or sulphide ions that would interfere with the silver nitrate test. · D. To precipitate nitrogen and sulphur as insoluble salts.

Question

Why is it necessary to boil the sodium fusion extract with concentrated nitric acid before testing for halogens if nitrogen or sulphur are also present?

FirstInTest · Accepted Answer

The document states: 'If nitrogen or sulphur is also present in the compound, the sodium fusion extract is first boiled with concentrated nitric acid to decompose cyanide or sulphide of sodium formed during Lassaigne's test. These ions would otherwise interfere with silver nitrate test for halogens.'

Answer

To increase the solubility of silver halides.

Answer

To oxidize halogens to their ionic form.

Answer

To decompose cyanide or sulphide ions that would interfere with the silver nitrate test.

Answer

To precipitate nitrogen and sulphur as insoluble salts.

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