1. Explain how fluorine is prepared by the electrolysis of KHF .
2. Give balanced eqn for the following
(i) Fluorine + NaOH
(ii) Ozone + aq potassium oxide.
3. Explain exactly why an aqueous solution of potassium hexcyanoferrate(II) does not give a test for ferrous ion.
131) It shud be KHF2 (Potassium bi fluoride)
KHF2 ------(elctro.)---> K+ + HF2- ----> K+ + HF + F-
Anode - 2F- -------> F2 + 2e-
Cathode - 2H+ + 2e- ------> H2 (Hydrogen frm water 'coz Red. potential H+ > K+)
2) i) 2F2 + 2NaOH ------> OF2 + 2NaF + H2O
ii) Shud form red coloured KO3 sol.n ,not completely sure...
3) K4[Fe(CN)6] - Once elements get associated in coordination, they lose their ionisation property. Hence in an aqueous we will only find 4K+ & the complex sphere => the sol.n wud not give test fr Fe2+ ion.
12) i) F2 + NaOH ( cold and dilute ) → NaF + OF2 + H2O
F2 + NaOH ( hot and conc. ) → NaF + O2 + H2O
ii) O3 + KOH → KO3( orange coloured solid ) + O2 + H2O
3) i didn't knew abt such a thing. i thought reaction of the two gives a white precipitate - K2Fe[Fe(CN)6]
