1.

How will you prepare chlorine in the laboratory ?

Answer»

Solution :(i) Chlorine is prepared by the ACTION of conc. Sulphuric acid on chlorides in presence of manganese dioxide.
`4NaCl+MnO_(2)+4H_(2)SO_(4) rarr Cl_(2)+MnCl_(2)+4NaHSO_(4)+2H_(2)O`
(ii) It can also be prepared by OXIDISING hydrochloric acid using various oxidising AGENTS such as manganese dioxide, lead dioxide, potassium permanganateor dichromate.
`PbO_(2)+4HCl rarr PbCl_(2)+2H_(2)O+Cl_(2)`
`MnO_(2)+4HCl rarr MnCl_(2)+2H_(2)O+Cl_(2)`
`2KMnO_(4)+16HCl rarr 2KCl +2MnCl_(2)+8H_(2)O+5Cl_(2)`
`K_(2)Cr_(2)O_(7)+14HCl rarr 2KCl+2CrCl_(3)+7H_(2)O+3Cl_(2)`
(iii) When bleachingpowder is treated with mineral acids acids chlorine is liberated
`CaOCl_(2)+2HCl rarr CaCl_(2)+H_(2)O+Cl_(2)`
`CaOCl_(2)+H_(2)SO_(4) rarr CaSO_(4)+H_(2)O+Cl_(2)`


Discussion

No Comment Found

Related InterviewSolutions