Why is the bond angle in PH_3 molecule lesser than in NH_3 molecule?

The critical temperature of water is higher than that of O_2 because the H_2O molecule has

Which has the larger bond angle H_2S or H_2O and why?

Why is bond angle of PH_3 molecule lesser than in NH_3 molecule?

Why the N-O bond in NO_2^- is short or than the N-O bond in NO_3^- ?

Give reasons of the following: The C-O-H bond angle in alcohols is slightly less than the tetrahedral angle.

Present a comparative account of the following: Bond angle of H_2O and H_2S .

Explain the following situations: in the structure of HNO_3 molecule, the N-O bond (121 pm) is shorter than N-OH bond (140 pm).

A train covered a certain distance at a uniform speed.If the train would have been 10 km/h faster,it would have taken 2 hours less than the scheduled time.And if the train were slower by 10 km/h,it would have taken 3 hours more than the scheduled time.Find the distance covered by the train.

For the reaction 4NH_3 + 5O_2 rarr 4NO + 6H_2O , the rate of formation of NO is 3.6xx10^-3 mol L^-1s^-1 . Calculate the rate of disappearance of NH_3 and the rate of formation of H_2O .