Expain the following: (i) Iodine dissolves more in Kl solution, than impure water (ii) KHF_(2) is well known, where as KHCl_(2) or KHBr_(2) does not excit. (iii) A mixture of He and O_(2) is used for respiration for deep see divers.

Expain the following: (i) Iodine dissolves more in Kl solution, than

1.	Expain the following: (i) Iodine dissolves more in Kl solution, than impure water (ii) KHF_(2) is well known, where as KHCl_(2) or KHBr_(2) does not excit. (iii) A mixture of He and O_(2) is used for respiration for deep see divers.
Answer» SOLUTION :(i) `I_(2)` is NON polar nature and thus solubility in water (a polar solvent) is less which however becomes more if Kl is present due to complex FORMATION. `I_(2) + Kl to Kl_(3)` (soluble complex) (ii) `H_(2)F_(2)` exist as dimetric molecule due to H-bonding and thus shows diabasic nature. hence, it gives two series of salts `KHF_(2)` as `[K^(+)]` and `F^(-)` ................... H ...... `F^(-)` and KF `[K^(+)]` and `F^(-)` where as HCl and HBr do not show hydrogen bonding and thus formation of `KHCl_(2)` and `KHBr_(2)` is not possible. (iii) Unlike `M_(2)`. helium is not soluble in blood even under high pressure and a mixture of He and `O_(2)` (80.20) is used instead of ordinary air, by divers for respiration.