19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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 a Dumas nitrogen estimation 0.3 g of an organic compound gave 50 cm3 of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the compound (vapour pressure of water at 300K is 15 mm) is
Paper chromatography is an example of : (NEET 2020)
The most suitable method of separation of 1: 1 mixture of ortho and para-nitrophenols is (NEET 2017)
Assertion (A): A mixture of o-nitrophenol and p- nitrophenol can be separated by steam distillation Reason (R): p-Nitrophenol is steam volatile while o- nitrophenol is not steam volatile. (AIIMS 2015)
In Duma's method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (Aque…
The Lassaigne's extract is boiled with conc. HNO3 while testing for halogens. By doing so it (CBSE AIPMT 2011)
1.2g of organic compound on Kjeldahlisation liberates ammonia which consumes 30 cm3 of 1N HCl. The percentage of nitrogen in the organic compound is (KCET 2011)
In Duma's method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (Aqueo…
The Lassaigne's extract is boiled with conc. HNO3 while testing for halogens. By doing so it (CBSE AIPMT 2011)
Which of the following compounds will not give answer Lassaigne’s test for nitrogen (DPMT 2010)
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)
Violet coloured complex obtained in the detection of sulphur is (AFMC 2010) (a) Na Fe(NO)(CN) (b) Na Fe(ONS)(CN) (c) Na Fe(CN) NOS
Sublimation is a process in which a solid (KCET 2010)
Which of the following compounds gives blood red coloration when it Lassaigne’s extract is treated with alkali and ferric chloride? (DPMT 2009)
A hydrocarbon contains 80% carbon. What is the empirical formula of the compound? (KCET 2009 )