Chemistry Question Bank

Which of following will give Lassaigne’s test for nitrogen

Which of the following statements is wrong?

Which of the following compounds will answer Lassaigne’s test for nitrogen

Sulphur is estimated by Carius method in the form of

Phenol and benzoic acid can be separated by

A hydrocarbon has carbon and hydrogen. Its molecular weight is 28. Its possible formula would be (AFMC 2009) (a) C H (b) C H (c) CH (d) C H Ans. (b) Sol. Compound Molecular weight C H 12 3 x C H x CH C H x Hence, the …

Among the following which compound gives precipitate with AgNO₃ solution? (a) (b) (c)

The masses of carbon, hydrogen and oxygen in an organic compound are in the ratio 6: 1: 8 respectively. Which of the following pairs of formulae correspond to the above information? (Kerala CEE 2009) (a) CH O and CH C…

Compounds which do not contain halogen but give positive Beilstein test?

A hydrocarbon contains 80% carbon. What is the empirical formula of the compound? (KCET 2009 )

How will you separate iodine from sodium chloride?

Phenols contains acidic H it reacts with KOH.

Which of the following observations is correct and is used in the identification of carboxylic acids?

An organic compound is heated with HNO₂ at 0 °C and then the resulting solution is added to a solution -napthol whereby a brilliant red dye is produced. The observations indicate that the compound possesses.

A mixture of acetone and CCl₄ can be separated by

0.765 g of an acid gives 0.535 g of CO₂ and 0.138 g of H₂O. Then, the ratio of the percentage of carbon and hydrogen is (JCECE 2010)

Which of the following test can use for separation of alcohol and phenol?

The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so it (CBSE AIPMT 2011)

Azeotropic distillation is used only to seperate azeotropes ie. constant boiling mixture. Here acetone & CCl₄ are not azeotropic mixture. Hence (a) is not correct.

HCOOH and HCHO may be distinguished by

CCl₄ & acetone differ in their boiling Point. So it can be seperated through fractional distillation. Hence (b) is correct.

Correct pair of compounds, which gives blue colouration/ precipitate and white precipitate, respectively, when their Lassaigne’s test is separately done is (West Bengal JEE 2013)

To separate a mixture of amines from each other, one should follow:

In sodium fusion test of organic compounds N is converted to (Bihar CECE 2015)

In the Lassaigne’s test for the detection of nitrogen in the organic compound, the appearance of blue coloured compound is (West Bengal PMT 2015)