1.

Pick out the incorrect statement regarding hydrogen halides.

Answer»

Hydrogen chloride can be prepared by the reaction of NaCl with conc. `H_2SO_4`
Reactions of respective ionic halides, i.e., NaBr and KI with conc. `H_2SO_4` are employed to produce HBr and HI
Hdrogen halides (X=Cl, Br, I) are prepared by action of phosphorus trihalides with water.
A solution of hydrogen chlorides in toluene does affect blue litmus paper.

Solution :Reactions of NaBr and KI with conc. `H_2SO_4` cannot be used to prepare HBr and EI, SINCE these two HYDRIDES are reducing agents and are readily oxidized by conc. `H_2SO_4`
`2HX +H_(2)SO_(4)to SO_(2)+2H_(2)O+X_(2), X=Br,I`
(a) (i) `NaCl+H_(2)SO_(4) to NaHSO_(4)+HCl("in the cold")`
(ii) `NaHSO_(4)+NaCl to NaHSO_(4)+HCl("on heating")`
(c) `PX_(3)+3H_(2)O to H_(2)PO_(3)+3HX`
For example `PCl_(3)+3H_(2)O to H_(3)PO_(3)+3HCl`
`underset(("Red"))(2P)+3Br_(2) to 2PBr_(3)`
`underset(("Red"))(2P)+3I_(2) to 2PI_(3)`
`PBr_(3)+3H_(2)O to H_(3)PO_(3)+3HBr_(2)`
`and PI_(3)+3H_(2)O to H_(3)PO_(3)+3HI`


Discussion

No Comment Found

Related InterviewSolutions