Chemistry Question Bank

An organic compound contains C, H, N, S and Cl. For the detection of chlorine, the sodium extract of the compound is first heated with a few drops of concentrated HNO₃ and then AgNO₃ is added to get a white ppt. of Ag…

If N and S both are present in an organic compound during Lassaigne’s test, both will change into

Which of the following will not give test for ‘N’ in sodium extract?

Lassaigne’s test is not shown by diazonium salts. Why?

Sodium nitrorusside Na₂[Fe(CN)₅NO] is used as reagent for detection of ______ and the compound formed is ____.

The prussian blue colouration obtained in the test for nitrogen in the organic compound is

When 0.32g of a compound is heated with conc. HNO₃ and BaCl₂, 0.932g BaSO₄ is obtained. The percentage of sulphur in the compound is

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

In the Duma's method of estimation of nitrogen, the nitrogen in the organic compound is finally converted into (Kerala CEE 2009)

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…

1 percent composition of an organic compound A is carbon: 85.71% and hydrogen 14.20% . Its vapour density is 14. Consider the following reaction sequence Cl /H O (i) KCN/EtOH (ii) H O A B C → → Identify C (EAMCET 2009…

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.

Phenols contains acidic H it reacts with KOH.

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

Phenol and benzoic acid can be separated by

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

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

Which of following will give Lassaigne’s test for nitrogen

Paper chromatography is an example of : (NEET 2020)

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)

The most suitable method of separation of 1: 1 mixture of ortho and para-nitrophenols is (NEET 2017)

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

Lassaigne's test is used in qualitative analysis to detect (UK PMT 2014)