Match List-I with List-II List-I List-II Test/Reagents/Observation(s) Species detected (a) Lassaigne's Test (i) Carbon (b) Cu(II) oxide (ii) Sulphur (c) Silver nitrate (iii) N , S , P , and halogen (d) The sodium fusion extract gives black precipitate with acetic acid and lead acetate (iv) Halogen Specifically The correct match is :

( a ) - ( iii ) , ( b ) - ( i ) , ( c ) - ( iv ) , ( d ) - ( ii )

( a ) - ( iii ) , ( b ) - ( i ) , ( c ) - ( ii ) , ( d ) - ( iv )

( a ) - ( i ) , ( b ) - ( iv ) , ( c ) - ( iii ) , ( d ) - ( ii )

( a ) - ( i ) , ( b ) - ( ii ) , ( c ) - ( iv ) , ( d ) - ( iii )

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The sodium extract of an organic compound on treatment with $F e S O_{4}$ solution, $F e C l_{3}$ and $H C l$ gives a red solution. The organic compound contains

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Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

In Lassaigne's test, on boiling sodium thiocyanate with ferrous sulphate produces

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?

HARD

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Match List-I with List-II

	List-I		List-II
	Test/Reagents/Observation(s)		Species detected
(a)	Lassaigne's Test	(i)	Carbon
(b)	Cu(II) oxide	(ii)	Sulphur
(c)	Silver nitrate	(iii)	$N, S, P$ , and halogen
(d)	The sodium fusion extract gives black precipitate with acetic acid and lead acetate	(iv)	Halogen Specifically

The correct match is :

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Using Kjeldahl's method over

1 g

of a soil sample, the ammonia evolved could neutralize

25 ml

1 {MH}_{2} {SO}_{4}

. Then, the percentage of nitrogen present in the sample is

EASY

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Which of the following compound will give blood red colour while doing the Lassaigne's test for

N

EASY

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

The potassium ferrocyanide solution gives a Prussian blue colour, when added to :

EASY

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Reagent,

1 -

naphthylamine and sulphanilic acid in acetic acid is used for the detection of

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

During halogen test, sodium fusion extract is boiled with concentrated

{HNO}_{3}

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

When nitrogen and chlorine containing organic compound is reacted with sodium metal, it forms

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

In the detection of nitrogen of an organic compound by Lassaigne's test, a prussian blue colour is obtained. This is due to the formation of which of the following complexes?

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Fusion mixture is

HARD

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Match the organic compounds in column -

I

with the Lassaigne's test result in column -

II

appropriately:

	Column – $I$		Column - $II$
A.	Aniline	i.	Red colour with $F e C l_{3}$
B.	Benzene sulfonic acid	ii.	Violet color with sodium nitroprusside
C.	Thiourea	iii.	Blue color with and acidic solution of $F e S O_{4}$

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

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 $NaCN$ and ${Na}_{2} S$ .

In the light of the above statements, choose the most appropriate answer from the options given below

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Which one of the following set of elements can be detected using sodium fusion extract?

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

The formula of the purple colour formed in Lassaigne's test for sulphur using sodium nitroprusside is

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Given below are two statements:

Statement I: Sulphanilic acid gives esterification test for carboxyl group.

Statement II: Sulphanilic acid gives red colour in Lassigne’s test for extra element detection.

In the light of the above statements, choose the most appropriate answer from the options given below:

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Compound that will give positive Lassaigne's test for both nitrogen and halogen is

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

During the fusion of organic compound with sodium metal, nitrogen present in the organic compound is converted into

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

Sodium extract is heated with concentrated

H N O_{3}

before testing for halogens because :

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Qualitative Analysis of Organic Compounds

In Lassaigne's extract of organic compound both nitrogen and sulphur are present, which gives blood-red colour with

{Fe}^{3 +}

due to the formation of

The sodium extract of an organic compound on treatment with FeSO4 solution, FeCl3 and HCl gives a red solution. The organic compound contains

Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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The sodium extract of an organic compound on treatment with $F e S O_{4}$ solution, $F e C l_{3}$ and $H C l$ gives a red solution. The organic compound contains