HARD
11th CBSE
IMPORTANT
Earn 100
The Lassaigne's extract is boiled with conc. while testing for halogens. By doing so it
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Important Questions on Organic Chemistry - Some Basic Principles and Techniques
HARD
11th CBSE
IMPORTANT
Lassaigne's test (with silver nitrate) is commonly used to detect halogens such as chlorine, bromine and iodine but not useful to detect fluorine because the product formed is
HARD
11th CBSE
IMPORTANT
Which of the following compounds will not give Lassaigne's test for nitrogen?
HARD
11th CBSE
IMPORTANT
Which of the following compounds gives blood red colouration when its Lassaigne's extract is treated with alkali and ferric chloride?
HARD
11th CBSE
IMPORTANT
The colour of solution/ precipitate obtained in the elemental analysis of an organic compound and the molecule/ ion responsible for the colour are given below. Choose the incorrectly matched pair:
HARD
11th CBSE
IMPORTANT
Correct pair of compounds which give blue colouration/ precipitate and white precipitate, respectively, when their Lassaigne's test is separately done is
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11th CBSE
IMPORTANT
of an organic compound containing and on combustion yields of and of . If one mole of a compound weighs , then molecular formula of the compound is
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11th CBSE
IMPORTANT
An organic compound having molecular mass is found to contain , and , while rest is oxygen. On heating, it gives ammonia along with a solid residue. The solid residue gave violet colour with alkaline copper sulphate solution. The compound is
HARD
11th CBSE
IMPORTANT
In Duma's method for estimation of nitrogen, of an organic compound gave of nitrogen collected at temperature and pressure. If the aqueous tension at is , the percentage of nitrogen in the compound is
