19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Sublimation is a process in which a solid (KCET 2010)
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
The colour of the solution/precipitate obtained in the elemental analysis of an organic compound and the molecule/ion responsible for the colour are given below. Choose the incorrectly matched pair: (Kerala PET 2013 )
Correct pair of compounds, which gives blue colouration/ precipitate and white precipitate, respectively, when their Lassaigne’s test is separately done is (West Bengal JEE 2013)
A liquid which decomposes at its boiling point can be purified by (Manipal 2014)
Which one of the following methods can be used to separate a mixture of ortho and para-nitrophenols? (EAMCET 2014)
In which among the following compounds presence of nitrogen cannot be detected by Lassaigne's method? (MHT CET 2014)
Lassaigne's test is used in qualitative analysis to detect (UK PMT 2014)
In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75g of sample neutralised 10 mL of 1M H SO . The percentage of nitrogen in the soil is (CBSE AIPMT 2014)
Camphor is purified by (Kerala PMT 2014)
An organic compound which produces a bluish green coloured flame on heating in presence of copper is (AIIMS 2014)
In sodium fusion test of organic compounds N is converted to (Bihar CECE 2015)
In the Lassaigne’s test for the detection of nitrogen in the organic compound, the appearance of blue coloured compound is (West Bengal PMT 2015)
0.30 g of an organic compound containing C, H and O on combustion yields 0.44 g CO2 and 0.18 g H2O. If one mole of compound weighs 60, then molecular formula of the compound is (Karnataka CET 2015)
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)
The most suitable method of separation of 1: 1 mixture of ortho and para-nitrophenols is (NEET 2017)
Paper chromatography is an example of : (NEET 2020)
Which of the following is the test of carbohydrates?
Which of the following test is not used for protein/amino acids–
An organic compound having carbon, hydrogen and sulphur contains 4% of sulphur. The minimum molecular weight of the compound is
Which of the following test is used for quantitative estimation of N
Find out the percentage of carbon in acetic acid.
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–
0.15 g of an organic compound gave 0.12 g of AgBr by Carius method. The percentage of bromine in the compound is
0.2475g of an organic compound gave on combustion 0.4950g of carbon dioxide and 0.2025g of water. The percentage of carbon and hydrogen are: