Chemistry Question Bank

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)

Kjeldahl's method cannot be used for the estimation of nitrogen in (AFMC 2013)

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)

Paper chromatography has following mobile and stationary phases respectively (Bihar CECE 2015)

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)

Which of the following test is not used for protein/amino acids–

In an organic compound, C 68.5% and H 4.91% . Which empirical formula is correct for it? (CPMT 2009) (a) C H (b) C H O (c) C H O (d) C H O Ans. (b) Sol. Element At. Percent No. of Simple molar wt. composition moles …