19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which Metal cyanide give a positive Lassaigne’s test for nitrogen?
Compounds which do not contain halogen but give positive Beilstein test?
Sulphur is estimated by Carius method in the form of
Acids reacts with KOH to form salt.
Phenols contains acidic H it reacts with KOH.
Amines are basic. Therefore, do not react with KOH.
KOH can be used as a drying agent for
Silver salt method is used to determine molecular weight of
Which of the following is the test of alcohol?
Which of the following compound Discharge bromine solution to colourless without evolving HBr?
Which of the following will give Tollen’s test?
Schiff test is used for the identification:
Zeisel’s method is use for the determination of
Which of the following is the test of carbohydrates?
Which of the following is the test of primary amine?
Which of the following test is not used for protein/amino acids–
In Carius method of estimation of halogens, 0.099 g organic compound gave 0.287. The percentage of chlorine in the compound will be (Haryana PMT 2010)
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)
In Kjeldahl's method, ammonia from 5g of food neutralizes 30 cm of 0.1 N acid. The percentage of nitrogen in the food is (KCET 2010)
In an organic compound, phosphorus is estimated as (AFMC 2010) (a) Mg P O (b) Mg PO (c) H PO (d) P O Ans. (a) Sol. In Carius method, the weighed organic compound (containing phosphorus) is heated with conc. HNO foll…
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…
Chemical formula of Prussian blue is (AFMC 2010) (a) Na Fe(CN) (b) K Fe(CN) (c) 6 3 Fe Fe(CN)
If N and S both are present in an organic compound during Lassaigne’s test, both will change into
The prussian blue colouration obtained in the test for nitrogen in the organic compound is
Sodium nitrorusside Na2[Fe(CN)5NO] is used as reagent for detection of ______ and the compound formed is ____.