Chemistry Question Bank

Which of the following statements is wrong?

Which of the following compounds will answer Lassaigne’s test for nitrogen

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–

Sulphur is estimated by Carius method in the form of

Azeotropic distillation is used only to seperate azeotropes ie. constant boiling mixture. Here acetone & CCl₄ are not azeotropic mixture. Hence (a) is not correct.

Which of the following test can use for separation of alcohol and phenol?

Assertion (A): During test for nitrogen with Lassaigne’s extract on adding FeCl₃ solution sometimes a red precipitate is obtained. Reason (R): Sulphur is also present (AIIMS₂₀₀₇)

Phenol and benzoic acid can be separated by

Among the following which compound gives precipitate with AgNO₃ solution? (a) (b) (c)

Compounds which do not contain halogen but give positive Beilstein test?

Phenols contains acidic H it reacts with KOH.

Which of the following observations is correct and is used in the identification of carboxylic acids?

The masses of carbon, hydrogen and oxygen in an organic compound are in the ratio 6: 1: 8 respectively. Which of the following pairs of formulae correspond to the above information? (Kerala CEE 2009) (a) CH O and CH C…

An organic compound is heated with HNO₂ at 0 °C and then the resulting solution is added to a solution -napthol whereby a brilliant red dye is produced. The observations indicate that the compound possesses.

A hydrocarbon contains 80% carbon. What is the empirical formula of the compound? (KCET 2009 )

Lassaigne’s test is not shown by diazonium salts. Why?

Sodium nitrorusside Na₂[Fe(CN)₅NO] is used as reagent for detection of ______ and the compound formed is ____.

The prussian blue colouration obtained in the test for nitrogen in the organic compound is

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 follow…

If N and S both are present in an organic compound during Lassaigne’s test, both will change into

Paper chromatography is an example of : (NEET 2020)

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

The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so it (CBSE AIPMT 2011)

In sodium fusion test of organic compounds N is converted to (Bihar CECE 2015)

An organic compound which produces a bluish green coloured flame on heating in presence of copper is (AIIMS 2014)