Although fluorine is much more electronegative than hydrogen yet the dipole moment of NF3(0.24D) is much lower than that of NH3(1.46D). Explain.

Dipole moment of SO_3 is higher /lower than that of SO_2

Dipole moment of CH_3F is less/more than that of CH_3Cl .

Though fluorine is more electronegative than chlorine yet BF_3 is a weaker lewis acid than BCl_3 , why ?

consider 0.1 M solutions of two solutes X and Y. The X behaves as a univalent electrolyte while the solute Y dimerises in solution. Which of the following statement are correct regarding these solutions? (1) The boiling point of the solution of X will be higher than that of Y (2) The osmotic pressure of the solution of Y will be lower than that of X (3) The freezing point of the solition of X will be lower than that of Y (4) The relative lowering of vapour pressure of both the solutions will be the same lt brgt Select the correct answer from the option given below

Explain the following fact : NH_3 is more basic than BiH_3 .

For a dilute solution containing 2.5 g of a non volatile non electrolyte solution in 100 g of water, the elevation in boiling point at 1 atm pressure is 2^@C . Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (take k b = 0.76 K Kg mol^-1 )

Account for the following : The E^@ value for the Mn^(3+)|Mn^(2+) couple is much more positive than that for Cr^(3+)|Cr^(2+) couple.

Ionisation energy of 5d-elements is more than 3d- and 4d-elements. Why ?

The 4d and 5d series of transition metals have more frequent metal-metal bonding in their compounds than do the 3d transition metals. Explain.