The Lassaigne’s extract is boiled with dilute , before testing for halogens because,

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Q.
The Lassaigne’s extract is boiled with dilute ${HNO}_{3}$ , before testing for halogens because, [2024]

1 AgCN is soluble in ${HNO}_{3}$ .

2 Silver halides are soluble in ${HNO}_{3}$ .

3 ${Ag}_{2} S$ is soluble in ${HNO}_{3}$ .

4 ${Na}_{2} S$ and NaCN are decomposed by ${HNO}_{3}$ .

Ans.
(4)

If the salt contains sulphide or cyanide, then Lassaigne’s extract would contain ${Na}_{2} S$ or NaCN. In such cases, upon the addition of ${AgNO}_{3}$ in the extract, ${Ag}_{2} S$ (black precipitate) or AgCN (white residue) are obtained which interferes with the test for halides. Hence Lassaigne’s extract is boiled with dil. ${HNO}_{3}$ to decompose ${Na}_{2} S$ or NaCN.

Solution

Q.
The Lassaigne’s extract is boiled with dilute ${HNO}_{3}$ , before testing for halogens because, [2024]

1 AgCN is soluble in ${HNO}_{3}$ .

2 Silver halides are soluble in ${HNO}_{3}$ .

3 ${Ag}_{2} S$ is soluble in ${HNO}_{3}$ .

4 ${Na}_{2} S$ and NaCN are decomposed by ${HNO}_{3}$ .

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Solution

Q. The Lassaigne’s extract is boiled with dilute HNO3, before testing for halogens because, [2024]

1 AgCN is soluble in HNO3.

2 Silver halides are soluble in HNO3.

3 Ag2S is soluble in HNO3.

4 Na2S and NaCN are decomposed by HNO3.

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Q.
The Lassaigne’s extract is boiled with dilute ${HNO}_{3}$ , before testing for halogens because, [2024]

1 AgCN is soluble in ${HNO}_{3}$ .

2 Silver halides are soluble in ${HNO}_{3}$ .

3 ${Ag}_{2} S$ is soluble in ${HNO}_{3}$ .

4 ${Na}_{2} S$ and NaCN are decomposed by ${HNO}_{3}$ .