19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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…
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…
A mixture of acetone and CCl₄ can be separated by
Chemical formula of Prussian blue is (AFMC 2010) (a) Na Fe(CN) (b) K Fe(CN) (c) 6 3 Fe Fe(CN)
Sulphur is estimated by Carius method in the form of
Which of the following statements is wrong?
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?
Sodium nitrorusside Na₂[Fe(CN)₅NO] is used as reagent for detection of ______ and the compound formed is ____.
The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so it (CBSE AIPMT 2011)
The Lassiaigne’s extract is boiled with conc. HNO₃ while testing for halogens. By doing so it (AIPMT Prelim 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.
Which of the following compounds will not give answer Lassaigne’s test for nitrogen (DPMT 2010)
Phenols contains acidic H it reacts with KOH.
In sodium fusion test of organic compounds N is converted to (Bihar CECE 2015)
Which of the following is the test of primary amine?
Which of the following test is not used for protein/amino acids–
Which of the following observations is correct and is used in the identification of carboxylic acids?
Seliwanoff’s test is used for the distinguish:
The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so it (CBSE AIPMT 2011)
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)
Paper chromatography has following mobile and stationary phases respectively (Bihar CECE 2015)