19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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)
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…
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…
Presence of halogen in organic compounds can be detected by using (UP CPMT 2012)
The Lassiaigne’s extract is boiled with conc. HNO3 while testing for halogens. By doing so it (AIPMT Prelim 2011)
1.2 g of organic compound of Kjeldalization liberaze ammonia which consumes 30 cm3 of 1N HCl. The percentage of nitrogen in the organic compound is (KCBT 2011)
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…
Chemical formula of Prussian blue is (AFMC 2010) (a) Na Fe(CN) (b) K Fe(CN) (c) 6 3 Fe Fe(CN)
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)
An organic liquid decomposes below its boiling point. How will you purify it?
How will you separate iodine from sodium chloride?
How will you purify a liquid having non-volatile impurities?
What type of organic compounds cannot be Kjeldahlised?
Sublimation is a process in which a solid (KCET 2010)
If N and S both are present in an organic compound during Lassaigne’s test, both will change into
0.395 g of an organic compound by Carius method for the estimiation of sulphur gave 0.582 g of BaSO4. The percentage of sulphur in the compound is–
Find out the percentage of carbon in acetic acid.
Which of the following test is used for quantitative estimation of N
An organic compound having carbon, hydrogen and sulphur contains 4% of sulphur. The minimum molecular weight of the compound is
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