19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The prussian blue colouration obtained in the test for nitrogen in the organic compound is
If N and S both are present in an organic compound during Lassaigne’s test, both will change into
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…
Kjeldahl’s method is used in the estimation of–
A mixture of acetone and CCl₄ can be separated by
Sulphur is estimated by Carius method in the form of
Which of the following statements is wrong?
Which of the following is the test of carbohydrates?
Compounds which do not contain halogen but give positive Beilstein test?
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.
Lassaigne’s test is not shown by diazonium salts. Why?
Which of the following compound Discharge bromine solution to colourless without evolving HBr?
Sodium nitrorusside Na₂[Fe(CN)₅NO] is used as reagent for detection of ______ and the compound formed 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.
Which of the following compounds will not give answer Lassaigne’s test for nitrogen (DPMT 2010)
Phenols contains acidic H it reacts with KOH.
How will you purify a liquid having non-volatile impurities?
A mixture of benzene and chloroform is separated by–
Which of the following observations is correct and is used in the identification of carboxylic acids?
What conclusion would you draw if during Lassaigne‘s test, a blood red colouration is obtained?
The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so it (CBSE AIPMT 2011)
The most suitable method of separation of 1: 1 mixture of ortho and para-nitrophenols is (NEET 2017)
Paper chromatography is an example of : (NEET 2020)
The molecular mass of a organic compound which contains only one nitrogen atom can be
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)