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Asked by Aman Vaishnav(JAI ACADEMY) , on 4/10/11

 because in ph3 there is one lone pair BUT in nh3 there is none

Posted by Prashant Kumaron 4/10/11

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 NH3 is a more polar molecules  due to the dipoles between the hydrogen and the nitrogen ( electronegitivity difference  of 0.9). Picking up a proton gives the molecule a charge, but removes the dipoles. PH3 is non-polar

Posted by Saksham Saxenaon 29/2/12


terimaa ki chute

Posted by Oumomon 22/3/12


its an easy ques....

as u knw that , NH3 as well as PH3 has a lone pair ........but we also have to consider drago 's rule ,  which states tht the hydrides of all the p block elements less than 2.5  can 't hybridise.....the electronegativity of N is 3.0 whereas the electro negativity of P is 2.45 .....so the Phosphorus in  PH3 does nt hybridise .....and so ,its lone pair is in sterio chemically inert s- orbital due to which the lone pair is not easy to donate  and hence cannot be treated as a good lewis base.....whereas in case of  N , in NH3 the lone pair is in sp3 hybridised orbital n can b easily donated by nitrogen........

remem.  greater the s- character greater will b the penetration power i.e more energy is required to remove the electron from that orbital which has greater s- character than the orbital which has lower  s- chac. ....

at last u can say , tht in PH3 the l.p is in almost s -orbital  and in case of NH3 , it is in sp3 hybridised orbital having s-charater = 33% only

Posted by Gauravon 27/3/12

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