19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following will not give test for ‘N’ in sodium extract?
The molecular mass of a organic compound which contains only one nitrogen atom can be
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
0.2475g of an organic compound gave on combustion 0.4950g of carbon dioxide and 0.2025g of water. The percentage of carbon and hydrogen are:
0.15 g of an organic compound gave 0.12 g of AgBr by Carius method. The percentage of bromine in the compound is
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
Chemical formula of Prussian blue is (AFMC 2010) (a) Na Fe(CN) (b) K Fe(CN) (c) 6 3 Fe Fe(CN)
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 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…
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)
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 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)
Which of the following compounds will not give answer Lassaigne’s test for nitrogen (DPMT 2010)
The Lassaigne's extract is boiled with conc. HNO3 while testing for halogens. By doing so it (CBSE AIPMT 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…
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)
The Lassaigne's extract is boiled with conc. HNO3 while testing for halogens. By doing so it (CBSE AIPMT 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…
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)
The Lassiaigne’s extract is boiled with conc. HNO3 while testing for halogens. By doing so it (AIPMT Prelim 2011)
Presence of halogen in organic compounds can be detected by using (UP CPMT 2012)
In the estimation of sulphur by Carius method 0.480 g of an organic compound given 0.699g of barium sulphide. The percentage of sulphur in this compound is (atomic masses : Ba = 137.5 = 32 and O = 16) (Kerala PET 2012)