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
Sodium nitrorusside Na₂[Fe(CN)₅NO] is used as reagent for detection of ______ and the compound formed is ____.
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…
Sulphur is estimated by Carius method in the form of
Compounds which do not contain halogen but give positive Beilstein test?
Lassaigne’s test is not shown by diazonium salts. Why?
Which of the following will not give test for ‘N’ in sodium extract?
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.
Which of the following statements is wrong?
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
The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is (RPMT 2010) (a) 6 3 Fe Fe(CN) (b) Na Fe(CN) (c) Fe(CN) (d) Na Fe(CN) COS Ans. (a) Sol. 3Na Fe(CN) 4Fe → 6 3 P…
Which of the following compounds will answer Lassaigne’s test for nitrogen
The [NH(CH₂)₆NHCO(CH₂)₄CO]n is a
is a polymer which have monomer units as (a) (b) (c) (d)
[NH(CH₂)NHCO(CH₂)₄CO]n is a (AIPMT 2006)
In a polymer sample, 30% of molecules have a molecular mass 20000, 40% have 30000 and the rest have 60000. What is the weight average molecular mass of the polymer? (Kerala CEE 2006)
In case of condensation of polymers (J&K CET 2008)
Structures of some common polymers are given. Which one is not correctly presented? (AIPMT 2009)
Teflon is a polymer of (Guj CET 2010)
Which compound/set of compounds is used in the manufacture of nylon-6,6? (BVP 2010)
Polymer used in bullet proof glass is (RPMT 2010)
Which one of the following sets forms the biodegradable polymer? (AIPMT 2012)