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Lassaigne's test when nitrogen and sulphur are both present (thiocyanate, blood red colour)

This type of question, asked 3 times: 26 Jun 2022, 29 Jan 2024, 23 Jan 2025. All 3 questions below, oldest first.

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  1. Question 1

    26 Jun 2022

    43
    Given below are two statements: Statement I: In 'Lassaigne's Test, when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed. Statement II: If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give NaCNNaCN and Na2 SNa_{2}\text{ }S. In the light of the above statements, choose the most appropriate answer from the options given below:

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  2. Question 2

    29 Jan 2024

    39
    Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with FeSO4FeSO_{4} in presence of concentrated H2SO4H_{2}SO_{4} indicates the presence of element/s

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  3. Question 3

    23 Jan 2025

    42
    Given below are two statements : Statement I : In Lassaigne's test, the covalent organic molecules are transformed into ionic compounds. Statement II : The sodium fusion extract of an organic compound having N and S gives prussian blue colour with FeSO4FeSO_{4} and Na4[Fe(CN)6]Na_{4}\left\lbrack Fe(CN)_{6} \right\rbrack In the light of the above statements, choose the correct answer from the options given below

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