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Salt Analysis question

2025 · 22 Jan · Shift 2 · Q7
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Salt Analysis question

2025 · 22 Jan · Shift 2 · Q7

JEE MainChemistrySalt AnalysisMCQ+4 / −1
Given below are two statements : Statement (I) : Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test. Statement (II) : The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test. In the light of the above statements, choose the correct answer from the options given below :
  1. A
    Both Statement I and Statement II are false
  2. B
    Statement I is true but Statement II is false
  3. C
    Statement I is false but Statement II is true
  4. D
    Both Statement I and Statement II are true
View written solutionFree

Correct answer: B

  1. Analyze Statement (I)

    Lassaigne's test is used to detect certain elements present in an organic compound such as:

    • Nitrogen
    • Sulphur
    • Halogens
    • Phosphorus

    In this test, these elements are converted into ionic sodium salts, which can then be identified by suitable chemical tests.

    Therefore, Statement (I) is true.

  2. Analyze Statement (II)

    In Lassaigne's test, the organic compound is fused with sodium metal, not magnesium.

    The purpose is to convert covalently bonded elements into ionic forms such as:

    • NaCN\text{NaCN}NaCN for nitrogen
    • Na2S\text{Na}_2\text{S}Na2​S for sulphur
    • NaX\text{NaX}NaX for halogens
    • Na3PO4\text{Na}_3\text{PO}_4Na3​PO4​ for phosphorus

    Since the statement says fusion is done with Magnesium, it is incorrect.

    Therefore, Statement (II) is false.

  3. Choose the correct option

    • Statement (I): True
    • Statement (II): False

    Hence, the correct option is:

    B\boxed{\text{B}}B​

  4. Comparison with stored correct answer

    Stored correct answer = B

    My derived answer = B

    So, they agree.

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