Chemistry Question Bank

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)

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

Which of the following statements is wrong?

Phenol and benzoic acid can be separated by

Sulphur is estimated by Carius method in the form of

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.

Which of the following reactions occur during the detection of nitrogen in organic substances by Lassaigne’s test?

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

HCOOH and HCHO may be distinguished by

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

How will you separate iodine from sodium chloride?

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

Column I Column II (pair of compounds) (identification test) (a) and (p) Tollen’s reagent test (b) OH and OH (q) Br₂ + H₂O test (c) O || H C OH and (r) Lucas test O || CH C OH (d) and (s) Iodoform test (t) Ammonical C…

Which of following will give Lassaigne’s test for nitrogen

Phenols contains acidic H it reacts with KOH.

A mixture of acetone and CCl₄ can be separated by

In Lassaigne’s test when both N and S are present, blood red colour obtained is due to the formation of–

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

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

Esters undergo hydrolysis in Presence of KOH

CCl₄ & acetone differ in their boiling Point. So it can be seperated through fractional distillation. Hence (b) is correct.

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)

Zeisel’s method is use for the determination of

The most suitable method of separation of 1: 1 mixture of ortho and para-nitrophenols is (NEET 2017)

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