7 questions from 2024
Methods used for purification of organic compounds are based on:
Identify the incorrect statements regarding primary standard of titrimetric analysis.(A) It should be purely available in dry form.(B) It should not undergo chemical change in air.(C) It should be hygroscopic and should react with another chemical instantaneously and stoichiometrically.(D) It should be readily soluble in water.(E) \( \mathrm{KMnO}_4 \) & \( \mathrm{NaOH} \) can be used as primary standard.Choose the correct answer from the options given below:
\(A\) and \(B\) formed in the following reaction are: \( \mathrm{CrO_2Cl_2} + 4\,\mathrm{NaOH} \rightarrow A + 2\,\mathrm{NaCl} + 2\,\mathrm{H_2O} \)\( A + 2\,\mathrm{HCl} + 2\,\mathrm{H_2O_2} \rightarrow B + 3\,\mathrm{H_2O} \)
Which of the following nitrogen containing compound does not give Lassaigne’s test?
Match List-I with List-II.
Choose the correct answer from the options given below:
The correct statement among the following, for a “chromatography” purification method is:
