Explain the following :
Hydrogen fluoride is much less volatile than hydrogen chloride.

How would you account for the following ? (i)The lower oxidation state becomes more stable with increasing atomic number in Group 13. (ii)Hydrogen fluoride is much less volatile than hydrogen chloride. (iii)Interhalogen compounds are strong oxidising agents.

Least volatile hydrogen halide is

Which of the following hydrogen halide is most volatile.

Hydrogen fluoride is a better reducing agent than hydrogen bromide.

Explain the following observations: (i) Phosphorus has a greater tendency for catenation than nitrogen (ii) The negative value of electron gain enthalpy is less for fluorine than for chlorine. (iii) Hydrogen fluoride has a much higher boiling point than hydrogen chloride

(a) Draw the structures of the following : (i) XeF_(4) (ii) H_(2)S_(2)O_(7) (iii) SO_(3)^(2-) (b) Explain the following observations : (i) Phosphorous has a greater tendency for catenation than nitrogen. (ii) The negative value of electron gain enthalpy is less for fluorine than that for chlorine. (iii) Hydrogen fluoride has a much higher boiling point than hydrogen chloride.

Explain the following observations : (i) Nitrogen is much less reactive than phosphorus. (ii) Despite having greater polarity, hydrogen fluoride boils at a lower temperature than water.

Explain the following: (a) More metal fluorides are ionic in nature than metal chlorides. (b) Perchloric acid is a stronger acid than sulphuric acid. (c ) Fluorine does not undergo disproportionation reactions but other halogens do.

Assign appropriate reasons for each of the following statements. (i)More metal fluorides are ionic in nature than metal chlorides. (ii) Hydrogen fluoride is a weaker acid than hydrogen chloride in aqueous solution. (iii)In aqueous solution HI is a stronger acid than HCI ? (iv) Addition of Cl_(2) to KI solution gives it a brown colour but excess of Cl_(2) turns it colourless. (v) Perchloric acid is a stronger acid than sulphuric acid.

Give reasons for the following Hydrogen chloride gas fumes in moist air but hydrogen sulphide gas does not.