Bonding7

Get answer through fajan's rule

@ eureka

I know that but how will i compare Mgo to NaCl??Using charge density??But i dont know how to??

Na^+,K^+,Mg^{2+},Ba^{2+}

Now higher the charge greater is covalency=> \ Melting \ point \ order \ :Na^+,K^+>Mg^{2+},Ba^{2+}

Now if charge same..smaller the size greater the covalency,

\begin{matrix} We \ know \ size :K^+ >Na^+\\ => Covalent \ character \ : Na^+>K^+ \\ => Melting \ point \ :K+>Na^+ \\ => Max. \ melting \ point =KCl \end{matrix}

I hope its clear now...

But eure, MgO has max MP i think..

Check up the values

I dont have the values...jsut did it by logic...anyways i will check now..

Ya..the values show opp trend...dont know why[7][7]

I think it has something to do with packing of the molecules in a lattice.

isnt it any application of diagonal relationship bcos li is more covalent than Na & its comparable to Mg .....

Yeah answer is also given as MgO but acc to Fajan it should be KCl..Now why??

Hi

thats teh real problem....i dont see anything wrong in my working....so how are we going to do in exam ???

We have to learn some of the things but its gud if anyone can explain this to us

we cant learn MP,BP and oher things of million compounds....there must be some logic...out of thousand other logics in inorganic

None of you think that it is related to packing of molecules?