Chp3 of Chem - class11
I can't understand what the Q means. As in, wht do i have to answer? need help!
26 Replies
@Dexter
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.the language doesn't seem right to me
Ngl mujhe bhi samajh nahi aaya 2-3 baar padhne ke baad bhi
Ignore this completely. Look at voice note.
group valency of P = 3, S = 2, but they form +5, +6 compounds (ox state) basically hypervalent ones. SiF62- also exists.
If i were to guess i would say these 3
but yea in a test skip
random language
this reasoning made it even more confusing
this seems like the expanded octet wala case(im not at all sure about wht i said)
what about Boron
^?
yup exactly, i m too unable to eliminate other elemnts with this reasoning
can u copy paste the question
Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is __. B, C, N, S, O, F, P, Al, Si
Yea ignore that लोल. Check the above idea out.
ohkk, got it sir
but..
HNO3 exists where N has valency of 5
Ans key me b) bol rhe hai par a) hoga na?
why will O- ion resist, it will rather happily accept another electron to complete it's octet
Good point!
Post this on another doubt please. Idhar se hata sakte hain.
anions mei addition of electron ka process is always endo, as far as i remember
i will ask this to my coaching tchrs too, and will let u know
There is a dative bind involved so it looks like N has a valency if 5
That is true, but u need energy to overcome the electron repulsions present bc of the first electron
Imo first option, ask ur teacher tho
Also oxygen doesn’t even have that high electron affinity, it is the lowest in its group
Okay delete krunga 🙂
Good night o7
Yes anyways kal puchunga
Oki, let me know too :]
ig its similar to that one reasoning q where PCl5 can be formed but NCl5 cant, its cus there is no presence of vacant d orbitals for period 2 elements, similar case for oxygen and flourine, they cant have valencies equal to their total valence electron number
@Slembash
its not valency, its oxidation state, they are different terms
ohk so P, S Si they can accomodate more electrons, basically extend their octet and fill their empty d orbitals- is this the reason?
then wht's is up with C and B? they also do not have d obitals, do they?
elements in group 3 and 4 can show their max valency without needing to be energized such that electron jumps to d shell and valency of 5 or more can be shown (as is seen in case of phosphorous and sulphus and chlorine)
yep
like in phosphorus the 3s electron can be energized and it jumps to 3d and hence there will be 5 unpaired electrons, hence showing valency of 5, the same cannot be said for nitrogen
ohhk
got tht...thnku
+solved @g-sus
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