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1.how to determine the hybridisation from pie bonds or sigma bonds


2.what is a triatomic molecule?


3.why does phosphine have lower melting point than ammonia?


4.although i3- is konown ,f3- is not why?


nacl gives a white precipitate with agno3 but ccl4 or chcl3 does not...plzzz explain!!


i would be really thankfull if you wud clear my doubts asap!

6 years ago

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Answers : (1)

										

Hii nishad ..


 


Hybridisation is actually not only determined by sigma and pie bonds..there are many defination to find out hybridisation of compound ...well i will tell you with example


 


Electron               Hybridisation


 


2                                 sp


3                                sp2


4                                sp3


5                                sp3d


6                                sp3d3


 


NH3                          H  --N(--H) -- H   so here we have three sigma bond...and one lone pair on N   so 3 + 1 = 4


so hybridisation = sp3


 


PCl5   here phoshphorus has 5 electron in outer most shell..5 Cl combines with all and form 5 sigma bond ..


so ..it gives  sp3d .


 


NO2+    N + has outer most e- = 4  two oxygen combines with four electron making two double bond ..


 


So we have total bond = 4   hence hybridisation sp3


 


 


2) I3-  is term as triatomic...with three I atoms combined each other two form a compund


3) Amonia exibits hydrogen Bonding ....


4) Because size of F is very small as compared to I ....thats why triatomic and negative charge leads to a larger repulsion in case of F ....hence F3- is not possible


5)


 


In case CCl4 ...Cl is in stable state and there is no chance that bond will break between C and Cl...so no chance of formation of AGcl when mixed with AgNO3


 


In case ChCl3...instead of Cl  ...Bond of C-H breaks out due to stability of C-cl3 (resonace)..which leads  no precipitation of AgCl ...


 


In case of NaCl....it breaks in Na+ and Cl-  and finally Cl- combines with AgNo3...and precipitate of AgCl is formed


 


I hope i have explained it


 


Yagya


 


askiitians_expert

6 years ago

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